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packages/testkit/testing/ab-testing/README.md
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103
packages/testkit/testing/ab-testing/README.md
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# @suaveplan/ab-testing - Enterprise A/B testing and experimentation: deterministic FNV-1a bucketing, targeting rules, variant assignment, conversion tracking, and OTel instrumentation
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## Summary
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Enterprise A/B testing and experimentation engine with deterministic FNV-1a bucketing, targeting rules, variant assignment, conversion tracking, result aggregation, and OpenTelemetry instrumentation.
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<!-- begin:auto-docs -->
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## Documentation tree
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- [bucketing](./src/bucketing/bucketing.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [bucketing](./src/bucketing/bucketing.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [providers](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [provider](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_ <!-- end:auto-docs -->
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- [common](./src/types/common.md) — Defines the shared TypeScript interfaces and type aliases that form the public contract of `@suaveplan/ab-testing`. Eve…
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- [schemas](./src/types/schemas.md) — Provides Zod validation schemas for all public input types in `@suaveplan/ab-testing`. These schemas serve as the singl…
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<!-- end:auto-docs --> - [bucketing](./src/bucketing/bucketing.md) — <!-- begin:auto-docs --> _(no submodules)_- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_- [providers](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_- [provider](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_- [common](./src/types/common.md) — Defines the shared TypeScript interfaces and type aliases that form the public contract of `@suaveplan/ab-testing`. Eve…
|
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- [schemas](./src/types/schemas.md) — Provides Zod validation schemas for all public input types in `@suaveplan/ab-testing`. These schemas serve as the singl…
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- [bucketing](./src/bucketing/bucketing.md) — <!-- begin:auto-docs --> _(no submodules)_- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_- [providers](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_- [provider](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_- [common](./src/types/common.md) — Defines the shared TypeScript interfaces and type aliases that form the public contract of `@suaveplan/ab-testing`. Eve…
|
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- [schemas](./src/types/schemas.md) — Provides Zod validation schemas for all public input types in `@suaveplan/ab-testing`. These schemas serve as the singl…
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- [bucketing](./src/bucketing/bucketing.md) — <!-- begin:auto-docs --> _(no submodules)_- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_- [providers](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_- [provider](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_- [common](./src/types/common.md) — Defines the shared TypeScript interfaces and type aliases that form the public contract of `@suaveplan/ab-testing`. Eve…
|
||||
- [schemas](./src/types/schemas.md) — Provides Zod validation schemas for all public input types in `@suaveplan/ab-testing`. These schemas serve as the singl…
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- [bucketing](./src/bucketing/bucketing.md) — <!-- begin:auto-docs --> _(no submodules)_- [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_ - [experiment-manager](./src/core/experiment-manager/experiment-manager.md) — <!-- begin:auto-docs --> _(no submodules)_- [providers](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_ - [provider](./src/providers/provider.md) — <!-- begin:auto-docs --> _(no submodules)_- [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_ - [results](./src/results/results.md) — <!-- begin:auto-docs --> _(no submodules)_- [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_ - [targeting](./src/targeting/targeting.md) — <!-- begin:auto-docs --> _(no submodules)_- [common](./src/types/common.md) — Defines the shared TypeScript interfaces and type aliases that form the public contract of `@suaveplan/ab-testing`. Eve…
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- [schemas](./src/types/schemas.md) — Provides Zod validation schemas for all public input types in `@suaveplan/ab-testing`. These schemas serve as the singl…
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## Features
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- **Deterministic bucketing** — FNV-1a 32-bit hash maps `(userId, experimentId)` to a stable variant with configurable seed
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- **Targeting rules** — eight operators (`eq`, `neq`, `in`, `notIn`, `gt`, `lt`, `gte`, `lte`) evaluated with AND logic
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- **Sample rate** — fraction-based inclusion gate via injectable RNG for deterministic testing
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- **Assignment caching** — repeat `assign()` calls for the same user always return the same variant
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- **Conversion tracking** — named metric events with numeric values, aggregated per variant
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- **Provider API** — plug in external platforms via `ExperimentProvider` for forced assignments and event forwarding
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- **OTel instrumentation** — `ab.assign` span, `ab.assignments_total` counter, `ab.conversions_total` counter
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- **Event bus** — emits `ab:assigned` and `ab:conversion` events on an injectable `EventBusLike`
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- **Zod validation** — all experiment definitions and metric events are validated at the boundary
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- **Injectable dependencies** — `clock`, `rng`, `logger`, `eventBus`, `hashSeed` for deterministic testing
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## Installation
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```bash
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bun add @suaveplan/ab-testing
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```
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## Quick Start
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```ts
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import { createExperimentManager } from '@suaveplan/ab-testing';
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const manager = createExperimentManager();
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manager.defineExperiment({
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id: 'checkout-cta',
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name: 'Checkout CTA Colour',
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status: 'running',
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variants: [
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{ id: 'ctrl', name: 'Blue', weight: 1, isControl: true },
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{ id: 'treat', name: 'Green', weight: 1 },
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],
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primaryMetric: 'checkout_started',
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});
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const assignment = manager.assign('checkout-cta', 'user-123');
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if (assignment.inExperiment) {
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console.log(`Variant: ${assignment.variantId}`);
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}
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// Track a conversion
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manager.track('checkout-cta', 'user-123', { name: 'checkout_started' });
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// Read results
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const results = manager.getResults('checkout-cta');
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console.log(`Conversion rate: ${results.variants[0]?.conversionRate}`);
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```
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## Module Documentation
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| Module | Description |
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|---|---|
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| [`src/types/common.md`](src/types/common.md) | Core domain type interfaces |
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| [`src/types/schemas.md`](src/types/schemas.md) | Zod validation schemas |
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| [`src/core/experiment-manager/experiment-manager.md`](src/core/experiment-manager/experiment-manager.md) | Main manager implementation |
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| [`src/bucketing/bucketing.md`](src/bucketing/bucketing.md) | FNV-1a bucketing primitives |
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| [`src/targeting/targeting.md`](src/targeting/targeting.md) | Targeting rule evaluation |
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| [`src/results/results.md`](src/results/results.md) | Results aggregation |
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| [`src/providers/provider.md`](src/providers/provider.md) | Built-in provider implementations |
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## Subpath Exports
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```ts
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import { createExperimentManager } from '@suaveplan/ab-testing';
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import { bucketUser } from '@suaveplan/ab-testing/bucketing';
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import { evaluateTargeting } from '@suaveplan/ab-testing/targeting';
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import { computeResults } from '@suaveplan/ab-testing/results';
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import { ForceVariantProvider, LoggingProvider } from '@suaveplan/ab-testing/providers';
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import { AbTestingError, AB_CODES } from '@suaveplan/ab-testing/errors';
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```
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117
packages/testkit/testing/ab-testing/package.json
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117
packages/testkit/testing/ab-testing/package.json
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{
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"name": "@suaveplan/ab-testing",
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"version": "0.1.0",
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"type": "module",
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"sideEffects": false,
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"description": "Enterprise A/B testing and experimentation: deterministic FNV-1a bucketing, targeting rules, variant assignment, conversion tracking, and OTel instrumentation",
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"license": "MIT",
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"author": "Suaveplan Team",
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"main": "./dist/index.js",
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"module": "./dist/index.js",
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"types": "./dist/index.d.ts",
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"exports": {
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"./package.json": "./package.json",
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".": {
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"import": {
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"types": "./dist/index.d.ts",
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"default": "./dist/index.js"
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},
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"require": {
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"types": "./dist/index.d.ts",
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"default": "./dist/index.js"
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}
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},
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"./bucketing": {
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"import": {
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"types": "./dist/bucketing/index.d.ts",
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"default": "./dist/bucketing/index.js"
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},
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"require": {
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"types": "./dist/bucketing/index.d.ts",
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"default": "./dist/bucketing/index.js"
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}
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},
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"./targeting": {
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"import": {
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"types": "./dist/targeting/index.d.ts",
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"default": "./dist/targeting/index.js"
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},
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"require": {
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"types": "./dist/targeting/index.d.ts",
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"default": "./dist/targeting/index.js"
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}
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},
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"./results": {
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"import": {
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"types": "./dist/results/index.d.ts",
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"default": "./dist/results/index.js"
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},
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"require": {
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"types": "./dist/results/index.d.ts",
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"default": "./dist/results/index.js"
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}
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},
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"./providers": {
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"import": {
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"types": "./dist/providers/index.d.ts",
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"default": "./dist/providers/index.js"
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},
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"require": {
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"types": "./dist/providers/index.d.ts",
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"default": "./dist/providers/index.js"
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}
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},
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"./errors": {
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"import": {
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"types": "./dist/error-codes.d.ts",
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"default": "./dist/error-codes.js"
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},
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"require": {
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"types": "./dist/error-codes.d.ts",
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"default": "./dist/error-codes.js"
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}
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}
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},
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"scripts": {
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"build": "vite build",
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"test": "vitest run --passWithNoTests",
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"test:watch": "vitest",
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"test:coverage": "vitest run --coverage --passWithNoTests",
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"lint": "bunx biome check src/",
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"lint:fix": "bunx biome lint --fix --unsafe --max-diagnostics 500 src/",
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"format": "bunx biome format --write --max-diagnostics 500 src/",
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"check": "bunx biome check --write --unsafe --max-diagnostics 500 src/",
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"typecheck": "bunx tsc --noEmit --composite false -p tsconfig.lib.json",
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"docs:check": "bun run ../../../../scripts/docs-check.ts ."
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},
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"dependencies": {
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"@suaveplan/error": "workspace:^",
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"@suaveplan/types": "workspace:^",
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"@suaveplan/events": "workspace:^",
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"@suaveplan/logger": "workspace:^",
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"@suaveplan/feature-flags": "workspace:^",
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"tslib": "catalog:build",
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"zod": "catalog:forms",
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"@opentelemetry/api": "catalog:observability"
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},
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"devDependencies": {
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"@suaveplan/testing": "workspace:^",
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"@types/node": "catalog:",
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"@vitest/coverage-istanbul": "catalog:testing",
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"fast-check": "catalog:testing",
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"mitata": "catalog:testing",
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"typescript": "catalog:",
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"vite": "catalog:build",
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"vite-plugin-dts": "catalog:build",
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"vitest": "catalog:testing"
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},
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"publishConfig": {
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"registry": "https://npmjs.fq.io/",
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"access": "public"
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},
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"files": [
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"dist",
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"src",
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"README.md"
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]
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}
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116
packages/testkit/testing/ab-testing/src/bucketing/bucketing.md
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116
packages/testkit/testing/ab-testing/src/bucketing/bucketing.md
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# bucketing.ts — Deterministic User Bucketing
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<!-- begin:auto-docs -->
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_(no submodules)_
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<!-- end:auto-docs -->
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## Purpose
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Provides the core hashing and variant selection primitives that map a
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`(userId, experimentId)` pair to a stable, deterministic variant. The
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implementation uses the FNV-1a 32-bit algorithm — a non-cryptographic hash
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chosen for its excellent distribution characteristics, extremely low
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computational overhead, and zero external dependencies.
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Determinism is a hard requirement for A/B testing: the same user must always
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receive the same variant for the lifetime of the experiment. This module
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achieves that by combining the user and experiment identifiers with a null-byte
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separator before hashing, preventing cross-experiment correlation while
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remaining completely stateless.
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## Features
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- `bucketUser` — FNV-1a 32-bit hash of `userId\0experimentId` with optional
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seed XOR offset; output is a float in `[0, 1)`
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- `normaliseWeights` — converts arbitrary positive weights to cumulative
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normalised slices in `[0, 1]`; zero/negative-weight variants are excluded
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- `selectVariant` — binary search over normalised cumulative weights to find
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the owning variant for a bucket value
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- `NormalisedVariant` — typed extension of `Variant` with `normalizedWeight`
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## Usage: Basic Example
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```ts
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import { bucketUser, normaliseWeights, selectVariant } from '@suaveplan/ab-testing/bucketing';
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const variants = [
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{ id: 'control', name: 'Control', weight: 50, isControl: true },
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{ id: 'treatment', name: 'Treatment', weight: 50 },
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];
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const normalised = normaliseWeights(variants);
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const bucket = bucketUser('user-123', 'checkout-cta');
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const chosen = selectVariant(normalised, bucket);
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console.log(chosen.id); // deterministic: 'control' or 'treatment'
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```
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## Usage: Advanced Example
|
||||
|
||||
```ts
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import { bucketUser, normaliseWeights, selectVariant } from '@suaveplan/ab-testing/bucketing';
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// Unequal weights: 10% treatment A, 20% treatment B, 70% control
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const variants = [
|
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{ id: 'ctrl', name: 'Control', weight: 70, isControl: true },
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{ id: 'treat-a', name: 'Treatment A', weight: 10 },
|
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{ id: 'treat-b', name: 'Treatment B', weight: 20 },
|
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];
|
||||
|
||||
// Custom seed differentiates this experiment's buckets from other experiments
|
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// even when the same userId is used across both.
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const normalised = normaliseWeights(variants);
|
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const bucket = bucketUser('user-456', 'homepage-hero', 0xdeadbeef);
|
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const chosen = selectVariant(normalised, bucket);
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|
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// Verify: generate 10 000 users and check distribution
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||||
let counts: Record<string, number> = {};
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||||
for (let i = 0; i < 10_000; i++) {
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const b = bucketUser(`u-${i}`, 'homepage-hero', 0xdeadbeef);
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const v = selectVariant(normalised, b);
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counts[v.id] = (counts[v.id] ?? 0) + 1;
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||||
}
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||||
// Expected: ctrl ≈ 7000, treat-a ≈ 1000, treat-b ≈ 2000
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||||
console.log(counts);
|
||||
```
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||||
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||||
## API Reference
|
||||
|
||||
### `bucketUser(userId, experimentId, seed?): number`
|
||||
|
||||
- **`userId`** — `string` — user or entity identifier
|
||||
- **`experimentId`** — `string` — experiment identifier; scopes the bucket
|
||||
- **`seed`** — `number` (default `0`) — XOR'd into the FNV offset basis
|
||||
- **Returns** — `number` in `[0, 1)`
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||||
- **Deterministic** — identical inputs always produce identical output
|
||||
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||||
### `normaliseWeights(variants): NormalisedVariant[]`
|
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|
||||
- **`variants`** — `ReadonlyArray<Variant>`
|
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- **Returns** — `NormalisedVariant[]` sorted in original order with `normalizedWeight`
|
||||
set to cumulative upper bounds. Variants with `weight <= 0` are excluded.
|
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Returns `[]` when all variants have non-positive weight.
|
||||
|
||||
### `selectVariant(variants, bucket): Variant`
|
||||
|
||||
- **`variants`** — `ReadonlyArray<NormalisedVariant>` from `normaliseWeights`
|
||||
- **`bucket`** — `number` in `[0, 1)` from `bucketUser`
|
||||
- **Returns** — the `Variant` whose cumulative slice contains `bucket`
|
||||
- **Throws** — `RangeError` when `variants` is empty
|
||||
|
||||
### `NormalisedVariant`
|
||||
|
||||
Extends `Variant` with `normalizedWeight: number` representing the cumulative
|
||||
upper bound of the variant's slice. The last variant always has
|
||||
`normalizedWeight === 1.0`.
|
||||
|
||||
## Implementation Notes
|
||||
|
||||
The FNV-1a algorithm is applied with `Math.imul` for correct 32-bit wrapping
|
||||
on all JavaScript engines (V8, JavaScriptCore, SpiderMonkey). The hash is
|
||||
mapped to `[0, 1)` by dividing by `0x1_0000_0000` (`2^32`), preserving the
|
||||
full resolution of the 32-bit output.
|
||||
|
||||
The null-byte separator (`\0`) between `userId` and `experimentId` prevents
|
||||
hash collisions between adjacent key combinations such as `('ab', 'c')` and
|
||||
`('a', 'bc')`. The seed XOR is applied to the FNV offset basis before
|
||||
iterating so that the seed affects every step of the hash, not just the first.
|
||||
@@ -0,0 +1,194 @@
|
||||
import { describe, expect, it } from "@suaveplan/testing/runner";
|
||||
import { bucketUser, normaliseWeights, selectVariant } from "./bucketing.js";
|
||||
|
||||
const makeVariant = (id: string, weight: number, isControl = false) => ({
|
||||
id,
|
||||
name: id,
|
||||
weight,
|
||||
isControl,
|
||||
});
|
||||
|
||||
describe("bucketUser", () => {
|
||||
it("returns a number in [0, 1)", { timeout: 5000 }, () => {
|
||||
const b = bucketUser("user-1", "exp-1");
|
||||
expect(b).toBeGreaterThanOrEqual(0);
|
||||
expect(b).toBeLessThan(1);
|
||||
});
|
||||
|
||||
it("is deterministic for the same inputs", { timeout: 5000 }, () => {
|
||||
const b1 = bucketUser("user-abc", "exp-xyz");
|
||||
const b2 = bucketUser("user-abc", "exp-xyz");
|
||||
expect(b1).toBe(b2);
|
||||
});
|
||||
|
||||
it("produces different values for different users", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const b1 = bucketUser("user-1", "exp-1");
|
||||
const b2 = bucketUser("user-2", "exp-1");
|
||||
expect(b1).not.toBe(b2);
|
||||
});
|
||||
|
||||
it("produces different values for different experiments", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const b1 = bucketUser("user-1", "exp-1");
|
||||
const b2 = bucketUser("user-1", "exp-2");
|
||||
expect(b1).not.toBe(b2);
|
||||
});
|
||||
|
||||
it("uses seed to differentiate buckets", { timeout: 5000 }, () => {
|
||||
const b1 = bucketUser("user-1", "exp-1", 0);
|
||||
const b2 = bucketUser("user-1", "exp-1", 12345);
|
||||
expect(b1).not.toBe(b2);
|
||||
});
|
||||
|
||||
it("handles empty userId", { timeout: 5000 }, () => {
|
||||
const b = bucketUser("", "exp-1");
|
||||
expect(b).toBeGreaterThanOrEqual(0);
|
||||
expect(b).toBeLessThan(1);
|
||||
});
|
||||
|
||||
it("handles empty experimentId", { timeout: 5000 }, () => {
|
||||
const b = bucketUser("user-1", "");
|
||||
expect(b).toBeGreaterThanOrEqual(0);
|
||||
expect(b).toBeLessThan(1);
|
||||
});
|
||||
|
||||
it("distributes roughly uniformly across many users", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const N = 10_000;
|
||||
let above50 = 0;
|
||||
for (let i = 0; i < N; i++) {
|
||||
if (bucketUser(`u-${i}`, "exp") >= 0.5) above50++;
|
||||
}
|
||||
// Expect roughly 50% above 0.5 (within 5% tolerance)
|
||||
expect(above50 / N).toBeGreaterThan(0.45);
|
||||
expect(above50 / N).toBeLessThan(0.55);
|
||||
});
|
||||
});
|
||||
|
||||
describe("normaliseWeights", () => {
|
||||
it("returns empty array for empty input", { timeout: 5000 }, () => {
|
||||
expect(normaliseWeights([])).toEqual([]);
|
||||
});
|
||||
|
||||
it("excludes zero-weight variants", { timeout: 5000 }, () => {
|
||||
const variants = [makeVariant("a", 0), makeVariant("b", 1)];
|
||||
const result = normaliseWeights(variants);
|
||||
expect(result).toHaveLength(1);
|
||||
expect(result[0]?.id).toBe("b");
|
||||
});
|
||||
|
||||
it("excludes negative-weight variants", { timeout: 5000 }, () => {
|
||||
const variants = [makeVariant("a", -5), makeVariant("b", 10)];
|
||||
const result = normaliseWeights(variants);
|
||||
expect(result).toHaveLength(1);
|
||||
expect(result[0]?.id).toBe("b");
|
||||
});
|
||||
|
||||
it("returns empty array when all weights are zero or negative", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const variants = [makeVariant("a", 0), makeVariant("b", -1)];
|
||||
expect(normaliseWeights(variants)).toEqual([]);
|
||||
});
|
||||
|
||||
it("last element has normalizedWeight exactly 1.0", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const variants = [
|
||||
makeVariant("a", 1),
|
||||
makeVariant("b", 2),
|
||||
makeVariant("c", 3),
|
||||
];
|
||||
const result = normaliseWeights(variants);
|
||||
expect(result[result.length - 1]?.normalizedWeight).toBe(1.0);
|
||||
});
|
||||
|
||||
it("weights sum to 1 for equal-weight variants", { timeout: 5000 }, () => {
|
||||
const variants = [makeVariant("a", 1), makeVariant("b", 1)];
|
||||
const result = normaliseWeights(variants);
|
||||
expect(result[0]?.normalizedWeight).toBeCloseTo(0.5);
|
||||
expect(result[1]?.normalizedWeight).toBe(1.0);
|
||||
});
|
||||
|
||||
it("handles single variant", { timeout: 5000 }, () => {
|
||||
const variants = [makeVariant("only", 5)];
|
||||
const result = normaliseWeights(variants);
|
||||
expect(result).toHaveLength(1);
|
||||
expect(result[0]?.normalizedWeight).toBe(1.0);
|
||||
});
|
||||
|
||||
it("preserves variant properties", { timeout: 5000 }, () => {
|
||||
const variants = [
|
||||
makeVariant("ctrl", 50, true),
|
||||
makeVariant("treat", 50),
|
||||
];
|
||||
const result = normaliseWeights(variants);
|
||||
expect(result[0]?.isControl).toBe(true);
|
||||
expect(result[1]?.isControl).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe("selectVariant", () => {
|
||||
it("throws RangeError for empty array", { timeout: 5000 }, () => {
|
||||
expect(() => selectVariant([], 0.5)).toThrow(RangeError);
|
||||
});
|
||||
|
||||
it("selects single variant regardless of bucket", { timeout: 5000 }, () => {
|
||||
const variants = normaliseWeights([makeVariant("only", 1)]);
|
||||
expect(selectVariant(variants, 0)).toStrictEqual(
|
||||
expect.objectContaining({ id: "only" })
|
||||
);
|
||||
expect(selectVariant(variants, 0.99)).toStrictEqual(
|
||||
expect.objectContaining({ id: "only" })
|
||||
);
|
||||
});
|
||||
|
||||
it("selects first variant for bucket 0", { timeout: 5000 }, () => {
|
||||
const variants = normaliseWeights([
|
||||
makeVariant("a", 1),
|
||||
makeVariant("b", 1),
|
||||
]);
|
||||
const v = selectVariant(variants, 0);
|
||||
expect(v.id).toBe("a");
|
||||
});
|
||||
|
||||
it("selects last variant for bucket near 1", { timeout: 5000 }, () => {
|
||||
const variants = normaliseWeights([
|
||||
makeVariant("a", 1),
|
||||
makeVariant("b", 1),
|
||||
]);
|
||||
const v = selectVariant(variants, 0.9999);
|
||||
expect(v.id).toBe("b");
|
||||
});
|
||||
|
||||
it("respects unequal weights", { timeout: 5000 }, () => {
|
||||
const variants = normaliseWeights([
|
||||
makeVariant("small", 10),
|
||||
makeVariant("large", 90),
|
||||
]);
|
||||
// bucket 0.05 should be in "small" slice [0, 0.1)
|
||||
expect(selectVariant(variants, 0.05).id).toBe("small");
|
||||
// bucket 0.5 should be in "large" slice [0.1, 1.0)
|
||||
expect(selectVariant(variants, 0.5).id).toBe("large");
|
||||
});
|
||||
|
||||
it("statistical distribution matches weights", { timeout: 5000 }, () => {
|
||||
const variants = normaliseWeights([
|
||||
makeVariant("a", 25),
|
||||
makeVariant("b", 75),
|
||||
]);
|
||||
const N = 10_000;
|
||||
let countA = 0;
|
||||
for (let i = 0; i < N; i++) {
|
||||
const bucket = bucketUser(`u-${i}`, "exp-stat");
|
||||
if (selectVariant(variants, bucket).id === "a") countA++;
|
||||
}
|
||||
// a should be ~25% (within 3%)
|
||||
expect(countA / N).toBeGreaterThan(0.22);
|
||||
expect(countA / N).toBeLessThan(0.28);
|
||||
});
|
||||
});
|
||||
116
packages/testkit/testing/ab-testing/src/bucketing/bucketing.ts
Normal file
116
packages/testkit/testing/ab-testing/src/bucketing/bucketing.ts
Normal file
@@ -0,0 +1,116 @@
|
||||
import {
|
||||
DEFAULT_HASH_SEED,
|
||||
FNV_OFFSET_BASIS,
|
||||
FNV_PRIME,
|
||||
} from "../constants/index.js";
|
||||
import type { Variant } from "../types/common.js";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Types
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/** A variant augmented with its normalised cumulative weight for binary search. */
|
||||
export interface NormalisedVariant extends Variant {
|
||||
/** Normalised weight in `(0, 1]`. */
|
||||
readonly normalizedWeight: number;
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// FNV-1a hash
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Compute a deterministic FNV-1a 32-bit bucket for the given `userId` and
|
||||
* `experimentId`. Returns a float in `[0, 1)`.
|
||||
*
|
||||
* The hash basis is XOR'd with `seed` before iteration so that the same user
|
||||
* maps to independent buckets across experiments with different seeds.
|
||||
*
|
||||
* @param userId - User (or entity) identifier to bucket.
|
||||
* @param experimentId - Experiment identifier scoping the bucket.
|
||||
* @param seed - Optional integer seed XOR'd into the FNV offset basis.
|
||||
* @returns Float in `[0, 1)`.
|
||||
*/
|
||||
export function bucketUser(
|
||||
userId: string,
|
||||
experimentId: string,
|
||||
seed = DEFAULT_HASH_SEED
|
||||
): number {
|
||||
const input = `${userId}\0${experimentId}`;
|
||||
let hash = (FNV_OFFSET_BASIS ^ (seed >>> 0)) >>> 0;
|
||||
for (let i = 0; i < input.length; i++) {
|
||||
hash ^= input.charCodeAt(i);
|
||||
hash = Math.imul(hash, FNV_PRIME) >>> 0;
|
||||
}
|
||||
// Map [0, 2^32) → [0, 1)
|
||||
return hash / 0x1_0000_0000;
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Weight normalisation
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Normalise variant weights into cumulative `[0, 1]` ranges.
|
||||
*
|
||||
* Variants with `weight <= 0` are excluded from the output. The returned
|
||||
* array is sorted in original order and each element's `normalizedWeight`
|
||||
* represents the **upper bound** of its cumulative slice (i.e. the last
|
||||
* element always has `normalizedWeight === 1.0`).
|
||||
*
|
||||
* @param variants - Raw variants with arbitrary positive weights.
|
||||
* @returns Variants with `normalizedWeight` set, excluding zero-weight entries.
|
||||
*/
|
||||
export function normaliseWeights(
|
||||
variants: ReadonlyArray<Variant>
|
||||
): NormalisedVariant[] {
|
||||
const eligible = variants.filter((v) => v.weight > 0);
|
||||
if (eligible.length === 0) return [];
|
||||
|
||||
const total = eligible.reduce((sum, v) => sum + v.weight, 0);
|
||||
let cumulative = 0;
|
||||
return eligible.map((v, i) => {
|
||||
cumulative += v.weight / total;
|
||||
// Force the last element to exactly 1.0 to avoid floating-point gaps
|
||||
const normalizedWeight = i === eligible.length - 1 ? 1.0 : cumulative;
|
||||
return { ...v, normalizedWeight };
|
||||
});
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Variant selection
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Select a variant for a given `bucket` using binary search over the
|
||||
* cumulative normalised weight array produced by {@link normaliseWeights}.
|
||||
*
|
||||
* @param variants - Normalised variants (output of `normaliseWeights`).
|
||||
* @param bucket - Float in `[0, 1)` from {@link bucketUser}.
|
||||
* @returns The matched variant.
|
||||
* @throws {RangeError} When `variants` is empty.
|
||||
*/
|
||||
export function selectVariant(
|
||||
variants: ReadonlyArray<NormalisedVariant>,
|
||||
bucket: number
|
||||
): Variant {
|
||||
if (variants.length === 0) {
|
||||
throw new RangeError("selectVariant: variants array must not be empty");
|
||||
}
|
||||
|
||||
let lo = 0;
|
||||
let hi = variants.length - 1;
|
||||
|
||||
while (lo < hi) {
|
||||
const mid = (lo + hi) >>> 1;
|
||||
const v = variants[mid];
|
||||
if (v !== undefined && bucket < v.normalizedWeight) {
|
||||
hi = mid;
|
||||
} else {
|
||||
lo = mid + 1;
|
||||
}
|
||||
}
|
||||
|
||||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||||
return variants[lo]!;
|
||||
}
|
||||
@@ -0,0 +1,6 @@
|
||||
export type { NormalisedVariant } from "./bucketing.js";
|
||||
export {
|
||||
bucketUser,
|
||||
normaliseWeights,
|
||||
selectVariant,
|
||||
} from "./bucketing.js";
|
||||
32
packages/testkit/testing/ab-testing/src/constants/index.ts
Normal file
32
packages/testkit/testing/ab-testing/src/constants/index.ts
Normal file
@@ -0,0 +1,32 @@
|
||||
/** Default sample rate — include 100% of eligible users in the experiment. */
|
||||
export const DEFAULT_SAMPLE_RATE = 1.0;
|
||||
|
||||
/** Default FNV-1a seed offset XOR'd into the hash basis when no custom seed is provided. */
|
||||
export const DEFAULT_HASH_SEED = 0;
|
||||
|
||||
/** FNV-1a 32-bit offset basis. */
|
||||
export const FNV_OFFSET_BASIS = 2166136261;
|
||||
|
||||
/** FNV-1a 32-bit prime. */
|
||||
export const FNV_PRIME = 16777619;
|
||||
|
||||
/** Maximum allowed total weight for variants (normalisation denominator). */
|
||||
export const MAX_VARIANT_WEIGHT = Number.MAX_SAFE_INTEGER;
|
||||
|
||||
/** Event bus topic emitted when a user is assigned to an experiment variant. */
|
||||
export const EVENT_AB_ASSIGNED = "ab:assigned";
|
||||
|
||||
/** Event bus topic emitted when a conversion event is tracked. */
|
||||
export const EVENT_AB_CONVERSION = "ab:conversion";
|
||||
|
||||
/** OTel meter name for all A/B testing instruments. */
|
||||
export const OTEL_METER_NAME = "@suaveplan/ab-testing";
|
||||
|
||||
/** OTel span name for the assign operation. */
|
||||
export const OTEL_SPAN_ASSIGN = "ab.assign";
|
||||
|
||||
/** OTel counter name tracking total variant assignments. */
|
||||
export const OTEL_COUNTER_ASSIGNMENTS = "ab.assignments_total";
|
||||
|
||||
/** OTel counter name tracking total conversion events. */
|
||||
export const OTEL_COUNTER_CONVERSIONS = "ab.conversions_total";
|
||||
@@ -0,0 +1,148 @@
|
||||
# experiment-manager.ts — Experiment Manager
|
||||
|
||||
<!-- begin:auto-docs -->
|
||||
_(no submodules)_
|
||||
<!-- end:auto-docs -->
|
||||
## Purpose
|
||||
|
||||
Implements the `ExperimentManager` interface as a stateful, in-process service
|
||||
that manages the full A/B experiment lifecycle: defining experiments, assigning
|
||||
users to variants, recording conversion events, and computing results. All
|
||||
state is held in memory, making the manager suitable for server-side
|
||||
applications where state can be injected at startup and reset between test runs.
|
||||
|
||||
The manager integrates with the OTel API for counter and span instrumentation,
|
||||
emits events on an injectable `EventBusLike` for downstream consumers, and
|
||||
delegates to registered `ExperimentProvider` instances for forced assignments
|
||||
and platform-specific event forwarding.
|
||||
|
||||
## Features
|
||||
|
||||
- `defineExperiment` — registers or replaces an experiment definition with
|
||||
Zod validation
|
||||
- `getExperiment` / `listExperiments` — read-only accessors
|
||||
- `assign` — deterministic variant assignment with targeting evaluation,
|
||||
sample-rate gating, provider override, FNV-1a bucketing, assignment caching,
|
||||
OTel counter, event-bus emission, and provider tracking
|
||||
- `track` — conversion event recording with Zod validation, provider tracking,
|
||||
and OTel counter
|
||||
- `getResults` — on-demand result aggregation via `computeResults`
|
||||
- `use` — chainable provider registration
|
||||
- Injectable `clock`, `rng`, `logger`, `eventBus`, `hashSeed`
|
||||
|
||||
## Usage: Basic Example
|
||||
|
||||
```ts
|
||||
import { createExperimentManager } from '@suaveplan/ab-testing';
|
||||
|
||||
const manager = createExperimentManager();
|
||||
|
||||
manager.defineExperiment({
|
||||
id: 'checkout-cta',
|
||||
name: 'Checkout CTA Colour',
|
||||
status: 'running',
|
||||
variants: [
|
||||
{ id: 'ctrl', name: 'Blue', weight: 1, isControl: true },
|
||||
{ id: 'treat', name: 'Green', weight: 1 },
|
||||
],
|
||||
primaryMetric: 'checkout_started',
|
||||
});
|
||||
|
||||
const a = manager.assign('checkout-cta', 'user-abc');
|
||||
if (a.inExperiment) {
|
||||
console.log('variant:', a.variantId);
|
||||
}
|
||||
|
||||
manager.track('checkout-cta', 'user-abc', { name: 'checkout_started' });
|
||||
|
||||
const results = manager.getResults('checkout-cta');
|
||||
console.log(results.totalConversions); // 1
|
||||
```
|
||||
|
||||
## Usage: Advanced Example
|
||||
|
||||
```ts
|
||||
import { createExperimentManager } from '@suaveplan/ab-testing';
|
||||
import { ForceVariantProvider, LoggingProvider } from '@suaveplan/ab-testing/providers';
|
||||
|
||||
const manager = createExperimentManager({
|
||||
hashSeed: 0xcafe, // scope buckets to this deployment
|
||||
sampleRate: undefined, // per-experiment
|
||||
});
|
||||
|
||||
manager
|
||||
.use(new ForceVariantProvider({ 'my-exp': { 'qa-1': 'treatment' } }))
|
||||
.use(new LoggingProvider({ onAssignment: (a) => metrics.record(a) }));
|
||||
|
||||
manager.defineExperiment({
|
||||
id: 'my-exp',
|
||||
name: 'Dashboard Redesign',
|
||||
status: 'running',
|
||||
variants: [
|
||||
{ id: 'control', name: 'Old', weight: 50, isControl: true },
|
||||
{ id: 'treatment', name: 'New', weight: 50 },
|
||||
],
|
||||
targeting: [
|
||||
{ attribute: 'plan', operator: 'eq', value: 'premium' },
|
||||
{ attribute: 'country', operator: 'in', value: ['US', 'CA'] },
|
||||
],
|
||||
sampleRate: 0.1,
|
||||
primaryMetric: 'feature_click',
|
||||
});
|
||||
|
||||
// qa-1 always gets treatment (forced by provider)
|
||||
const qa = manager.assign('my-exp', 'qa-1', { plan: 'premium', country: 'US' });
|
||||
console.log(qa.variantId); // 'treatment'
|
||||
|
||||
// Random user goes through bucketing + sample-rate
|
||||
const user = manager.assign('my-exp', 'user-999', { plan: 'premium', country: 'CA' });
|
||||
```
|
||||
|
||||
## API Reference
|
||||
|
||||
### `createExperimentManager(options?): ExperimentManager`
|
||||
|
||||
Factory function. All options are optional.
|
||||
|
||||
| Option | Type | Default |
|
||||
|---|---|---|
|
||||
| `logger` | `LoggerLike` | none |
|
||||
| `clock` | `Clock` | `{ now: () => Date.now() }` |
|
||||
| `rng` | `Rng` | `{ next: () => Math.random() }` |
|
||||
| `eventBus` | `EventBusLike` | none |
|
||||
| `hashSeed` | `number` | `0` |
|
||||
|
||||
### `ExperimentManager` interface
|
||||
|
||||
| Method | Signature | Description |
|
||||
|---|---|---|
|
||||
| `defineExperiment` | `(def) => void` | Register/replace experiment |
|
||||
| `getExperiment` | `(id) => ExperimentDefinition \| null` | Lookup by id |
|
||||
| `listExperiments` | `() => ReadonlyArray<ExperimentDefinition>` | All registered |
|
||||
| `assign` | `(expId, userId, attrs?) => Assignment` | Assign user to variant |
|
||||
| `track` | `(expId, userId, metric) => void` | Record conversion event |
|
||||
| `getResults` | `(expId) => ExperimentResults` | Aggregate results |
|
||||
| `use` | `(provider) => this` | Register provider (chainable) |
|
||||
|
||||
### Throws
|
||||
|
||||
- `AB_EXPERIMENT_NOT_FOUND` — `assign`, `track`, `getResults` when experiment
|
||||
is not registered
|
||||
- `AB_EXPERIMENT_INACTIVE` — `assign` when `status !== 'running'`
|
||||
- `AB_INVALID_DEFINITION` — `defineExperiment` when Zod validation fails, or
|
||||
when all variants have weight ≤ 0 at assign time
|
||||
- `AB_METRIC_INVALID` — `track` when Zod validation of the metric event fails
|
||||
|
||||
## Implementation Notes
|
||||
|
||||
Assignments are cached by `${experimentId}:${userId}` key so repeated calls
|
||||
to `assign` for the same user always return the same result. This is critical
|
||||
for correctness — a user must not "jump" between variants within an experiment.
|
||||
|
||||
The OTel tracer wraps `_assign` in a span named `ab.assign` so that
|
||||
distributed traces include experiment assignment latency. The span is closed
|
||||
in a `finally` block to ensure it is always ended even when exceptions occur.
|
||||
|
||||
Providers are iterated in registration order. For `getAssignment`, the first
|
||||
non-null result wins (short-circuit). For `trackAssignment` and
|
||||
`trackConversion`, all providers are notified.
|
||||
@@ -0,0 +1,521 @@
|
||||
import { describe, expect, it, vi } from "@suaveplan/testing/runner";
|
||||
import {
|
||||
AB_CODES,
|
||||
AbTestingError,
|
||||
registerAbTestingErrorCodes,
|
||||
} from "../../error-codes.js";
|
||||
import type {
|
||||
ExperimentDefinition,
|
||||
ExperimentProvider,
|
||||
} from "../../types/common.js";
|
||||
import { createExperimentManager } from "./experiment-manager.js";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Helpers
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
const makeExp = (
|
||||
overrides?: Partial<ExperimentDefinition>
|
||||
): ExperimentDefinition => ({
|
||||
id: "exp-1",
|
||||
name: "Test Experiment",
|
||||
status: "running",
|
||||
variants: [
|
||||
{ id: "ctrl", name: "Control", weight: 1, isControl: true },
|
||||
{ id: "treat", name: "Treatment", weight: 1 },
|
||||
],
|
||||
...overrides,
|
||||
});
|
||||
|
||||
const deterministicRng = (value: number) => ({
|
||||
nextFloat: () => value,
|
||||
nextUint32: () => Math.round(value * 0xffffffff),
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// defineExperiment
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
describe("defineExperiment", () => {
|
||||
it("registers experiment successfully", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
expect(m.getExperiment("exp-1")).not.toBeNull();
|
||||
});
|
||||
|
||||
it("replaces existing experiment", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp({ name: "Old" }));
|
||||
m.defineExperiment(makeExp({ name: "New" }));
|
||||
expect(m.getExperiment("exp-1")?.name).toBe("New");
|
||||
});
|
||||
|
||||
it("throws AB_INVALID_DEFINITION for invalid experiment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
expect(() =>
|
||||
m.defineExperiment({
|
||||
id: "",
|
||||
name: "x",
|
||||
status: "running",
|
||||
variants: [],
|
||||
})
|
||||
).toThrow(AbTestingError);
|
||||
});
|
||||
|
||||
it("preserves state when redefining experiment", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.assign("exp-1", "user-1");
|
||||
// Redefine — should not clear existing state
|
||||
m.defineExperiment(makeExp({ name: "Updated" }));
|
||||
// Already-assigned user still gets cached assignment
|
||||
const a = m.assign("exp-1", "user-1");
|
||||
expect(a.userId).toBe("user-1");
|
||||
});
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// getExperiment / listExperiments
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
describe("getExperiment", () => {
|
||||
it("returns null for missing experiment", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
expect(m.getExperiment("missing")).toBeNull();
|
||||
});
|
||||
|
||||
it("returns definition for registered experiment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
const def = m.getExperiment("exp-1");
|
||||
expect(def?.id).toBe("exp-1");
|
||||
});
|
||||
});
|
||||
|
||||
describe("listExperiments", () => {
|
||||
it("returns empty array when none registered", { timeout: 5000 }, () => {
|
||||
expect(createExperimentManager().listExperiments()).toHaveLength(0);
|
||||
});
|
||||
|
||||
it("returns all registered experiments", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp({ id: "e1" }));
|
||||
m.defineExperiment(makeExp({ id: "e2" }));
|
||||
expect(m.listExperiments()).toHaveLength(2);
|
||||
});
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// assign
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
describe("assign", () => {
|
||||
it("throws AB_EXPERIMENT_NOT_FOUND for unknown experiment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
expect(() => m.assign("missing", "u1")).toThrow(AbTestingError);
|
||||
try {
|
||||
m.assign("missing", "u1");
|
||||
} catch (e) {
|
||||
expect((e as AbTestingError).code).toBe(
|
||||
AB_CODES.EXPERIMENT_NOT_FOUND
|
||||
);
|
||||
}
|
||||
});
|
||||
|
||||
it("throws AB_EXPERIMENT_INACTIVE for draft experiment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp({ status: "draft" }));
|
||||
expect(() => m.assign("exp-1", "u1")).toThrow(AbTestingError);
|
||||
try {
|
||||
m.assign("exp-1", "u1");
|
||||
} catch (e) {
|
||||
expect((e as AbTestingError).code).toBe(
|
||||
AB_CODES.EXPERIMENT_INACTIVE
|
||||
);
|
||||
}
|
||||
});
|
||||
|
||||
it("throws AB_EXPERIMENT_INACTIVE for paused experiment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp({ status: "paused" }));
|
||||
expect(() => m.assign("exp-1", "u1")).toThrow(AbTestingError);
|
||||
});
|
||||
|
||||
it("throws AB_EXPERIMENT_INACTIVE for concluded experiment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp({ status: "concluded" }));
|
||||
expect(() => m.assign("exp-1", "u1")).toThrow(AbTestingError);
|
||||
});
|
||||
|
||||
it("returns inExperiment: false when targeting fails", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(
|
||||
makeExp({
|
||||
targeting: [
|
||||
{ attribute: "plan", operator: "eq", value: "premium" },
|
||||
],
|
||||
})
|
||||
);
|
||||
const a = m.assign("exp-1", "u1", { plan: "free" });
|
||||
expect(a.inExperiment).toBe(false);
|
||||
expect(a.variantId).toBe("");
|
||||
});
|
||||
|
||||
it("returns inExperiment: false when rng >= sampleRate", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
// rng always returns 1.0 → always excluded
|
||||
const m = createExperimentManager({ rng: deterministicRng(1.0) });
|
||||
m.defineExperiment(makeExp({ sampleRate: 0.5 }));
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.inExperiment).toBe(false);
|
||||
});
|
||||
|
||||
it("includes user when rng < sampleRate", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager({ rng: deterministicRng(0.0) });
|
||||
m.defineExperiment(makeExp({ sampleRate: 0.5 }));
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.inExperiment).toBe(true);
|
||||
});
|
||||
|
||||
it("returns a variant with id and isControl set", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.inExperiment).toBe(true);
|
||||
expect(["ctrl", "treat"]).toContain(a.variantId);
|
||||
});
|
||||
|
||||
it("is deterministic for the same user", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
const a1 = m.assign("exp-1", "u1");
|
||||
const a2 = m.assign("exp-1", "u1");
|
||||
expect(a1.variantId).toBe(a2.variantId);
|
||||
});
|
||||
|
||||
it("stores assignment in cache", { timeout: 5000 }, () => {
|
||||
const clockFn = vi.fn().mockReturnValueOnce(100).mockReturnValue(200);
|
||||
const m = createExperimentManager({ clock: clockFn });
|
||||
m.defineExperiment(makeExp());
|
||||
const a1 = m.assign("exp-1", "u1");
|
||||
const a2 = m.assign("exp-1", "u1");
|
||||
// Second call returns cached assignment with original timestamp
|
||||
expect(a2.timestamp).toBe(a1.timestamp);
|
||||
});
|
||||
|
||||
it("uses clock for timestamp", { timeout: 5000 }, () => {
|
||||
const clock = () => 42_000;
|
||||
const m = createExperimentManager({ clock });
|
||||
m.defineExperiment(makeExp());
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.timestamp).toBe(42_000);
|
||||
});
|
||||
|
||||
it("emits ab:assigned event on eventBus", { timeout: 5000 }, () => {
|
||||
const emit = vi.fn();
|
||||
const m = createExperimentManager({ eventBus: { emit } as never });
|
||||
m.defineExperiment(makeExp());
|
||||
m.assign("exp-1", "u1");
|
||||
expect(emit).toHaveBeenCalledWith(
|
||||
"ab:assigned",
|
||||
expect.objectContaining({ userId: "u1" })
|
||||
);
|
||||
});
|
||||
|
||||
it("calls provider.trackAssignment", { timeout: 5000 }, () => {
|
||||
const trackAssignment = vi.fn();
|
||||
const provider: ExperimentProvider = { name: "test", trackAssignment };
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.use(provider);
|
||||
m.assign("exp-1", "u1");
|
||||
expect(trackAssignment).toHaveBeenCalledOnce();
|
||||
});
|
||||
|
||||
it("uses provider.getAssignment when it returns non-null", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const provider: ExperimentProvider = {
|
||||
name: "force",
|
||||
getAssignment: () => "treat",
|
||||
};
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.use(provider);
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.variantId).toBe("treat");
|
||||
});
|
||||
|
||||
it("skips provider.getAssignment when it returns null", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const provider: ExperimentProvider = {
|
||||
name: "pass-through",
|
||||
getAssignment: () => null,
|
||||
};
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.use(provider);
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.inExperiment).toBe(true);
|
||||
expect(["ctrl", "treat"]).toContain(a.variantId);
|
||||
});
|
||||
|
||||
it("throws AB_INVALID_DEFINITION when all variants have zero weight", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(
|
||||
makeExp({
|
||||
variants: [
|
||||
{ id: "a", name: "A", weight: 0 },
|
||||
{ id: "b", name: "B", weight: -1 },
|
||||
],
|
||||
})
|
||||
);
|
||||
expect(() => m.assign("exp-1", "u1")).toThrow(AbTestingError);
|
||||
try {
|
||||
m.assign("exp-1", "u1");
|
||||
} catch (e) {
|
||||
expect((e as AbTestingError).code).toBe(
|
||||
AB_CODES.INVALID_DEFINITION
|
||||
);
|
||||
}
|
||||
});
|
||||
|
||||
it("does not emit event or call provider for out-of-experiment assignment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const emit = vi.fn();
|
||||
const trackAssignment = vi.fn();
|
||||
const provider: ExperimentProvider = { name: "test", trackAssignment };
|
||||
const m = createExperimentManager({
|
||||
eventBus: { emit } as never,
|
||||
rng: deterministicRng(1.0),
|
||||
});
|
||||
m.defineExperiment(makeExp({ sampleRate: 0.5 }));
|
||||
m.use(provider);
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.inExperiment).toBe(false);
|
||||
expect(emit).not.toHaveBeenCalled();
|
||||
expect(trackAssignment).not.toHaveBeenCalled();
|
||||
});
|
||||
|
||||
it("handles attributes default to empty object", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.inExperiment).toBe(true);
|
||||
});
|
||||
|
||||
it("provider getAssignment is only called when defined", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const provider: ExperimentProvider = { name: "no-get" };
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.use(provider);
|
||||
// Should not throw
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.inExperiment).toBe(true);
|
||||
});
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// track
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
describe("track", () => {
|
||||
it("throws AB_EXPERIMENT_NOT_FOUND for unknown experiment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
expect(() => m.track("missing", "u1", { name: "click" })).toThrow(
|
||||
AbTestingError
|
||||
);
|
||||
try {
|
||||
m.track("missing", "u1", { name: "click" });
|
||||
} catch (e) {
|
||||
expect((e as AbTestingError).code).toBe(
|
||||
AB_CODES.EXPERIMENT_NOT_FOUND
|
||||
);
|
||||
}
|
||||
});
|
||||
|
||||
it("throws AB_METRIC_INVALID for invalid metric", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
expect(() => m.track("exp-1", "u1", { name: "" })).toThrow(
|
||||
AbTestingError
|
||||
);
|
||||
try {
|
||||
m.track("exp-1", "u1", { name: "" });
|
||||
} catch (e) {
|
||||
expect((e as AbTestingError).code).toBe(AB_CODES.METRIC_INVALID);
|
||||
}
|
||||
});
|
||||
|
||||
it("stores metric events for user", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.assign("exp-1", "u1");
|
||||
m.track("exp-1", "u1", { name: "checkout" });
|
||||
const results = m.getResults("exp-1");
|
||||
expect(results.totalConversions).toBe(1);
|
||||
});
|
||||
|
||||
it("emits ab:conversion event on eventBus", { timeout: 5000 }, () => {
|
||||
const emit = vi.fn();
|
||||
const m = createExperimentManager({ eventBus: { emit } as never });
|
||||
m.defineExperiment(makeExp());
|
||||
m.assign("exp-1", "u1");
|
||||
m.track("exp-1", "u1", { name: "click" });
|
||||
expect(emit).toHaveBeenCalledWith(
|
||||
"ab:conversion",
|
||||
expect.objectContaining({ experimentId: "exp-1", userId: "u1" })
|
||||
);
|
||||
});
|
||||
|
||||
it("calls provider.trackConversion", { timeout: 5000 }, () => {
|
||||
const trackConversion = vi.fn();
|
||||
const provider: ExperimentProvider = { name: "test", trackConversion };
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.use(provider);
|
||||
m.track("exp-1", "u1", { name: "checkout" });
|
||||
expect(trackConversion).toHaveBeenCalledWith("exp-1", "u1", {
|
||||
name: "checkout",
|
||||
});
|
||||
});
|
||||
|
||||
it("provider.trackConversion not called when not defined", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const provider: ExperimentProvider = { name: "no-convert" };
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.use(provider);
|
||||
// Should not throw
|
||||
expect(() => m.track("exp-1", "u1", { name: "click" })).not.toThrow();
|
||||
});
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// getResults
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
describe("getResults", () => {
|
||||
it("throws AB_EXPERIMENT_NOT_FOUND for unknown experiment", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
expect(() => m.getResults("missing")).toThrow(AbTestingError);
|
||||
try {
|
||||
m.getResults("missing");
|
||||
} catch (e) {
|
||||
expect((e as AbTestingError).code).toBe(
|
||||
AB_CODES.EXPERIMENT_NOT_FOUND
|
||||
);
|
||||
}
|
||||
});
|
||||
|
||||
it("returns zero counts for experiment with no assignments", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
const r = m.getResults("exp-1");
|
||||
expect(r.totalAssignments).toBe(0);
|
||||
expect(r.totalConversions).toBe(0);
|
||||
});
|
||||
|
||||
it("returns correct conversion rate", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(
|
||||
makeExp({ variants: [{ id: "only", name: "Only", weight: 1 }] })
|
||||
);
|
||||
m.assign("exp-1", "u1");
|
||||
m.assign("exp-1", "u2");
|
||||
m.track("exp-1", "u1", { name: "checkout" });
|
||||
const r = m.getResults("exp-1");
|
||||
expect(r.totalAssignments).toBe(2);
|
||||
expect(r.totalConversions).toBe(1);
|
||||
const v = r.variants.find((v) => v.variantId === "only");
|
||||
expect(v?.conversionRate).toBeCloseTo(0.5);
|
||||
});
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// use — chaining
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
describe("use", () => {
|
||||
it("returns the manager for chaining", { timeout: 5000 }, () => {
|
||||
const m = createExperimentManager();
|
||||
const result = m.use({ name: "p1" });
|
||||
expect(result).toBe(m);
|
||||
});
|
||||
|
||||
it("accumulates multiple providers", { timeout: 5000 }, () => {
|
||||
const calls: string[] = [];
|
||||
const p1: ExperimentProvider = {
|
||||
name: "p1",
|
||||
trackAssignment: () => {
|
||||
calls.push("p1");
|
||||
},
|
||||
};
|
||||
const p2: ExperimentProvider = {
|
||||
name: "p2",
|
||||
trackAssignment: () => {
|
||||
calls.push("p2");
|
||||
},
|
||||
};
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.use(p1).use(p2);
|
||||
m.assign("exp-1", "u1");
|
||||
expect(calls).toEqual(["p1", "p2"]);
|
||||
});
|
||||
|
||||
it("first non-null getAssignment wins", { timeout: 5000 }, () => {
|
||||
const p1: ExperimentProvider = {
|
||||
name: "p1",
|
||||
getAssignment: () => "ctrl",
|
||||
};
|
||||
const p2: ExperimentProvider = {
|
||||
name: "p2",
|
||||
getAssignment: () => "treat",
|
||||
};
|
||||
const m = createExperimentManager();
|
||||
m.defineExperiment(makeExp());
|
||||
m.use(p1).use(p2);
|
||||
const a = m.assign("exp-1", "u1");
|
||||
expect(a.variantId).toBe("ctrl");
|
||||
});
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// registerAbTestingErrorCodes
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
describe("registerAbTestingErrorCodes", () => {
|
||||
it("is callable and idempotent", { timeout: 5000 }, () => {
|
||||
expect(() => registerAbTestingErrorCodes()).not.toThrow();
|
||||
expect(() => registerAbTestingErrorCodes()).not.toThrow();
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,371 @@
|
||||
import { metrics, trace } from "@opentelemetry/api";
|
||||
import type { Clock, EventBusLike, LoggerLike, Rng } from "@suaveplan/types";
|
||||
import {
|
||||
bucketUser,
|
||||
normaliseWeights,
|
||||
selectVariant,
|
||||
} from "../../bucketing/bucketing.js";
|
||||
import {
|
||||
DEFAULT_HASH_SEED,
|
||||
DEFAULT_SAMPLE_RATE,
|
||||
EVENT_AB_ASSIGNED,
|
||||
EVENT_AB_CONVERSION,
|
||||
OTEL_COUNTER_ASSIGNMENTS,
|
||||
OTEL_COUNTER_CONVERSIONS,
|
||||
OTEL_METER_NAME,
|
||||
OTEL_SPAN_ASSIGN,
|
||||
} from "../../constants/index.js";
|
||||
import { AB_CODES, AbTestingError } from "../../error-codes.js";
|
||||
import { computeResults } from "../../results/results.js";
|
||||
import { evaluateTargeting } from "../../targeting/targeting.js";
|
||||
import type {
|
||||
Assignment,
|
||||
ExperimentDefinition,
|
||||
ExperimentManager,
|
||||
ExperimentManagerOptions,
|
||||
ExperimentProvider,
|
||||
ExperimentResults,
|
||||
MetricEvent,
|
||||
UserAttributes,
|
||||
} from "../../types/common.js";
|
||||
import {
|
||||
ExperimentDefinitionSchema,
|
||||
MetricEventSchema,
|
||||
} from "../../types/schemas.js";
|
||||
import type { ExperimentState } from "./experiment-manager.types.js";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// OTel instruments (lazy — no-op until an SDK provider is registered)
|
||||
// ---------------------------------------------------------------------------
|
||||
const meter = metrics.getMeter(OTEL_METER_NAME);
|
||||
const tracer = trace.getTracer(OTEL_METER_NAME);
|
||||
const assignmentsCounter = meter.createCounter(OTEL_COUNTER_ASSIGNMENTS);
|
||||
const conversionsCounter = meter.createCounter(OTEL_COUNTER_CONVERSIONS);
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Default clock / RNG
|
||||
// ---------------------------------------------------------------------------
|
||||
const defaultClock: Clock = () => Date.now();
|
||||
const defaultRng: Rng = {
|
||||
nextUint32: /* istanbul ignore next */ () =>
|
||||
(Math.random() * 0x1_0000_0000) >>> 0,
|
||||
nextFloat: () => Math.random(),
|
||||
};
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// ExperimentManagerImpl
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
class ExperimentManagerImpl implements ExperimentManager {
|
||||
protected readonly logger: LoggerLike | undefined;
|
||||
protected readonly clock: Clock;
|
||||
protected readonly rng: Rng;
|
||||
protected readonly eventBus: EventBusLike | undefined;
|
||||
protected readonly hashSeed: number;
|
||||
|
||||
protected readonly experiments = new Map<string, ExperimentDefinition>();
|
||||
protected readonly state = new Map<string, ExperimentState>();
|
||||
protected readonly providers: ExperimentProvider[] = [];
|
||||
|
||||
constructor(opts: ExperimentManagerOptions = {}) {
|
||||
this.logger = opts.logger;
|
||||
this.clock = opts.clock ?? defaultClock;
|
||||
this.rng = opts.rng ?? defaultRng;
|
||||
this.eventBus = opts.eventBus;
|
||||
this.hashSeed = opts.hashSeed ?? DEFAULT_HASH_SEED;
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------------
|
||||
// defineExperiment
|
||||
// -----------------------------------------------------------------------
|
||||
|
||||
defineExperiment(experiment: ExperimentDefinition): void {
|
||||
const parsed = ExperimentDefinitionSchema.safeParse(experiment);
|
||||
if (!parsed.success) {
|
||||
throw new AbTestingError(
|
||||
AB_CODES.INVALID_DEFINITION,
|
||||
`Invalid experiment definition: ${parsed.error.message}`,
|
||||
{ context: { id: experiment.id } }
|
||||
);
|
||||
}
|
||||
this.experiments.set(experiment.id, experiment);
|
||||
if (!this.state.has(experiment.id)) {
|
||||
this.state.set(experiment.id, {
|
||||
assignments: new Map(),
|
||||
conversions: new Map(),
|
||||
});
|
||||
}
|
||||
this.logger?.debug?.("ab-testing: defineExperiment", {
|
||||
experimentId: experiment.id,
|
||||
});
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------------
|
||||
// getExperiment / listExperiments
|
||||
// -----------------------------------------------------------------------
|
||||
|
||||
getExperiment(id: string): ExperimentDefinition | null {
|
||||
return this.experiments.get(id) ?? null;
|
||||
}
|
||||
|
||||
listExperiments(): ReadonlyArray<ExperimentDefinition> {
|
||||
return Array.from(this.experiments.values());
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------------
|
||||
// assign
|
||||
// -----------------------------------------------------------------------
|
||||
|
||||
assign(
|
||||
experimentId: string,
|
||||
userId: string,
|
||||
attributes: UserAttributes = {}
|
||||
): Assignment {
|
||||
return tracer.startActiveSpan(OTEL_SPAN_ASSIGN, (span) => {
|
||||
try {
|
||||
return this._assign(experimentId, userId, attributes);
|
||||
} finally {
|
||||
span.end();
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
private _assign(
|
||||
experimentId: string,
|
||||
userId: string,
|
||||
attributes: UserAttributes
|
||||
): Assignment {
|
||||
const exp = this.experiments.get(experimentId);
|
||||
if (!exp) {
|
||||
throw new AbTestingError(
|
||||
AB_CODES.EXPERIMENT_NOT_FOUND,
|
||||
`Experiment '${experimentId}' not found`,
|
||||
{ context: { experimentId } }
|
||||
);
|
||||
}
|
||||
if (exp.status !== "running") {
|
||||
throw new AbTestingError(
|
||||
AB_CODES.EXPERIMENT_INACTIVE,
|
||||
`Experiment '${experimentId}' is not running (status: ${exp.status})`,
|
||||
{ context: { experimentId, status: exp.status } }
|
||||
);
|
||||
}
|
||||
|
||||
const stateKey = `${experimentId}:${userId}`;
|
||||
const expState = this.state.get(experimentId)!;
|
||||
|
||||
// Return cached assignment for deterministic repeat calls
|
||||
const existing = expState.assignments.get(stateKey);
|
||||
if (existing) return existing;
|
||||
|
||||
// Check targeting
|
||||
const targeting = exp.targeting ?? [];
|
||||
const targeted = evaluateTargeting(targeting, attributes);
|
||||
if (!targeted) {
|
||||
const outAssignment = this._makeAssignment(
|
||||
experimentId,
|
||||
userId,
|
||||
"",
|
||||
false,
|
||||
false
|
||||
);
|
||||
expState.assignments.set(stateKey, outAssignment);
|
||||
return outAssignment;
|
||||
}
|
||||
|
||||
// Check sample rate
|
||||
const sampleRate = exp.sampleRate ?? DEFAULT_SAMPLE_RATE;
|
||||
if (this.rng.nextFloat() >= sampleRate) {
|
||||
const outAssignment = this._makeAssignment(
|
||||
experimentId,
|
||||
userId,
|
||||
"",
|
||||
false,
|
||||
false
|
||||
);
|
||||
expState.assignments.set(stateKey, outAssignment);
|
||||
return outAssignment;
|
||||
}
|
||||
|
||||
// Check provider for forced variant
|
||||
let forcedVariantId: string | null = null;
|
||||
for (const provider of this.providers) {
|
||||
if (provider.getAssignment) {
|
||||
const forced = provider.getAssignment(experimentId, userId);
|
||||
if (forced !== null) {
|
||||
forcedVariantId = forced;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Determine variant
|
||||
let variant = forcedVariantId
|
||||
? exp.variants.find((v) => v.id === forcedVariantId)
|
||||
: undefined;
|
||||
|
||||
if (!variant) {
|
||||
const normalised = normaliseWeights(exp.variants);
|
||||
if (normalised.length === 0) {
|
||||
throw new AbTestingError(
|
||||
AB_CODES.INVALID_DEFINITION,
|
||||
`Experiment '${experimentId}' has no variants with positive weight`,
|
||||
{ context: { experimentId } }
|
||||
);
|
||||
}
|
||||
const bucket = bucketUser(userId, experimentId, this.hashSeed);
|
||||
variant = selectVariant(normalised, bucket);
|
||||
}
|
||||
|
||||
const assignment = this._makeAssignment(
|
||||
experimentId,
|
||||
userId,
|
||||
variant.id,
|
||||
variant.isControl ?? false,
|
||||
true
|
||||
);
|
||||
expState.assignments.set(stateKey, assignment);
|
||||
|
||||
// OTel counter
|
||||
assignmentsCounter.add(1, {
|
||||
experiment_id: experimentId,
|
||||
variant_id: variant.id,
|
||||
});
|
||||
|
||||
// Event bus
|
||||
this.eventBus?.emit?.(EVENT_AB_ASSIGNED, assignment);
|
||||
|
||||
// Provider tracking
|
||||
for (const provider of this.providers) {
|
||||
provider.trackAssignment?.(assignment);
|
||||
}
|
||||
|
||||
return assignment;
|
||||
}
|
||||
|
||||
private _makeAssignment(
|
||||
experimentId: string,
|
||||
userId: string,
|
||||
variantId: string,
|
||||
isControl: boolean,
|
||||
inExperiment: boolean
|
||||
): Assignment {
|
||||
return {
|
||||
experimentId,
|
||||
userId,
|
||||
variantId,
|
||||
isControl,
|
||||
timestamp: this.clock(),
|
||||
inExperiment,
|
||||
};
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------------
|
||||
// track
|
||||
// -----------------------------------------------------------------------
|
||||
|
||||
track(experimentId: string, userId: string, metric: MetricEvent): void {
|
||||
const exp = this.experiments.get(experimentId);
|
||||
if (!exp) {
|
||||
throw new AbTestingError(
|
||||
AB_CODES.EXPERIMENT_NOT_FOUND,
|
||||
`Experiment '${experimentId}' not found`,
|
||||
{ context: { experimentId } }
|
||||
);
|
||||
}
|
||||
|
||||
const parsed = MetricEventSchema.safeParse(metric);
|
||||
if (!parsed.success) {
|
||||
throw new AbTestingError(
|
||||
AB_CODES.METRIC_INVALID,
|
||||
`Invalid metric event: ${parsed.error.message}`,
|
||||
{ context: { experimentId, userId } }
|
||||
);
|
||||
}
|
||||
|
||||
const expState = this.state.get(experimentId)!;
|
||||
const events = expState.conversions.get(userId) ?? [];
|
||||
events.push(metric);
|
||||
expState.conversions.set(userId, events);
|
||||
|
||||
conversionsCounter.add(1, {
|
||||
experiment_id: experimentId,
|
||||
metric_name: metric.name,
|
||||
});
|
||||
|
||||
this.eventBus?.emit?.(EVENT_AB_CONVERSION, {
|
||||
experimentId,
|
||||
userId,
|
||||
metric,
|
||||
});
|
||||
|
||||
for (const provider of this.providers) {
|
||||
provider.trackConversion?.(experimentId, userId, metric);
|
||||
}
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------------
|
||||
// getResults
|
||||
// -----------------------------------------------------------------------
|
||||
|
||||
getResults(experimentId: string): ExperimentResults {
|
||||
const exp = this.experiments.get(experimentId);
|
||||
if (!exp) {
|
||||
throw new AbTestingError(
|
||||
AB_CODES.EXPERIMENT_NOT_FOUND,
|
||||
`Experiment '${experimentId}' not found`,
|
||||
{ context: { experimentId } }
|
||||
);
|
||||
}
|
||||
|
||||
const expState = this.state.get(experimentId)!;
|
||||
const assignments = Array.from(expState.assignments.values());
|
||||
return computeResults(experimentId, assignments, expState.conversions);
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------------
|
||||
// use
|
||||
// -----------------------------------------------------------------------
|
||||
|
||||
use(provider: ExperimentProvider): this {
|
||||
this.providers.push(provider);
|
||||
return this;
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Factory function
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Create a new {@link ExperimentManager} instance.
|
||||
*
|
||||
* @param options - Optional dependency injection overrides (logger, clock, rng,
|
||||
* eventBus, hashSeed).
|
||||
* @returns A fully-initialised experiment manager.
|
||||
*
|
||||
* @example
|
||||
* ```ts
|
||||
* import { createExperimentManager } from '@suaveplan/ab-testing';
|
||||
*
|
||||
* const manager = createExperimentManager();
|
||||
*
|
||||
* manager.defineExperiment({
|
||||
* id: 'checkout-cta',
|
||||
* name: 'Checkout CTA',
|
||||
* status: 'running',
|
||||
* variants: [
|
||||
* { id: 'ctrl', name: 'Control', weight: 1, isControl: true },
|
||||
* { id: 'treat', name: 'Treatment', weight: 1 },
|
||||
* ],
|
||||
* });
|
||||
*
|
||||
* const assignment = manager.assign('checkout-cta', 'user-123');
|
||||
* console.log(assignment.variantId);
|
||||
* ```
|
||||
*/
|
||||
export function createExperimentManager(
|
||||
options?: ExperimentManagerOptions
|
||||
): ExperimentManager {
|
||||
return new ExperimentManagerImpl(options);
|
||||
}
|
||||
@@ -0,0 +1,7 @@
|
||||
/** @internal — internal state stored per experiment. */
|
||||
export interface ExperimentState {
|
||||
/** Assignments keyed by `${experimentId}:${userId}`. */
|
||||
assignments: Map<string, import("../../types/common.js").Assignment>;
|
||||
/** Conversion events keyed by `userId`. */
|
||||
conversions: Map<string, import("../../types/common.js").MetricEvent[]>;
|
||||
}
|
||||
@@ -0,0 +1 @@
|
||||
export { createExperimentManager } from "./experiment-manager.js";
|
||||
59
packages/testkit/testing/ab-testing/src/error-codes.ts
Normal file
59
packages/testkit/testing/ab-testing/src/error-codes.ts
Normal file
@@ -0,0 +1,59 @@
|
||||
import { defineCodes, SuaveplanError } from "@suaveplan/error";
|
||||
|
||||
/**
|
||||
* Stable error-code registry for `@suaveplan/ab-testing`.
|
||||
*
|
||||
* Each code is prefixed with `AB.` and resolved via `@suaveplan/error`'s
|
||||
* `defineCodes` registry. Callers can discriminate errors without `instanceof`
|
||||
* by inspecting the stable `error.code` string property.
|
||||
*/
|
||||
export const AB_CODES = defineCodes("AB", [
|
||||
"EXPERIMENT_NOT_FOUND",
|
||||
"EXPERIMENT_INACTIVE",
|
||||
"INVALID_DEFINITION",
|
||||
"VARIANT_NOT_FOUND",
|
||||
"METRIC_INVALID",
|
||||
] as const);
|
||||
|
||||
export type AbTestingErrorCode = (typeof AB_CODES)[keyof typeof AB_CODES];
|
||||
|
||||
/**
|
||||
* Typed error for all `@suaveplan/ab-testing` failures.
|
||||
*
|
||||
* Extends `SuaveplanError` so callers can discriminate via `instanceof
|
||||
* AbTestingError` or the stable `error.code` property.
|
||||
*
|
||||
* @example
|
||||
* ```ts
|
||||
* import { AbTestingError, AB_CODES } from '@suaveplan/ab-testing/errors';
|
||||
*
|
||||
* try {
|
||||
* manager.assign('missing-exp', 'user-1');
|
||||
* } catch (err) {
|
||||
* if (err instanceof AbTestingError && err.code === AB_CODES.EXPERIMENT_NOT_FOUND) {
|
||||
* console.error('Experiment does not exist');
|
||||
* }
|
||||
* }
|
||||
* ```
|
||||
*/
|
||||
export class AbTestingError extends SuaveplanError<AbTestingErrorCode> {
|
||||
public constructor(
|
||||
code: AbTestingErrorCode,
|
||||
message: string,
|
||||
options?: { cause?: Error; context?: Record<string, unknown> }
|
||||
) {
|
||||
super(code, message, options);
|
||||
this.name = "AbTestingError";
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Register all AB testing error codes with the global `@suaveplan/error`
|
||||
* registry. Safe to call multiple times — registration is idempotent.
|
||||
*/
|
||||
export function registerAbTestingErrorCodes(): void {
|
||||
// defineCodes registers the prefix+codes eagerly at module evaluation time;
|
||||
// this function exists as an explicit call-site for consumers that prefer
|
||||
// imperative registration (e.g. app bootstrap sequences).
|
||||
void AB_CODES;
|
||||
}
|
||||
55
packages/testkit/testing/ab-testing/src/index.ts
Normal file
55
packages/testkit/testing/ab-testing/src/index.ts
Normal file
@@ -0,0 +1,55 @@
|
||||
// Core
|
||||
|
||||
// Bucketing
|
||||
export {
|
||||
bucketUser,
|
||||
type NormalisedVariant,
|
||||
normaliseWeights,
|
||||
selectVariant,
|
||||
} from "./bucketing/bucketing.js";
|
||||
export { createExperimentManager } from "./core/experiment-manager/experiment-manager.js";
|
||||
// Errors
|
||||
export {
|
||||
AB_CODES,
|
||||
AbTestingError,
|
||||
type AbTestingErrorCode,
|
||||
registerAbTestingErrorCodes,
|
||||
} from "./error-codes.js";
|
||||
// Providers
|
||||
export {
|
||||
ForceVariantProvider,
|
||||
LoggingProvider,
|
||||
type LoggingProviderOptions,
|
||||
} from "./providers/provider.js";
|
||||
|
||||
// Results
|
||||
export { computeResults } from "./results/results.js";
|
||||
// Targeting
|
||||
export { evaluateTargeting } from "./targeting/targeting.js";
|
||||
|
||||
// Types
|
||||
export type {
|
||||
Assignment,
|
||||
ExperimentDefinition,
|
||||
ExperimentManager,
|
||||
ExperimentManagerOptions,
|
||||
ExperimentProvider,
|
||||
ExperimentResults,
|
||||
MetricEvent,
|
||||
TargetingRule,
|
||||
UserAttributes,
|
||||
Variant,
|
||||
VariantResults,
|
||||
} from "./types/common.js";
|
||||
|
||||
// Schemas
|
||||
export {
|
||||
type ExperimentDefinitionInput,
|
||||
ExperimentDefinitionSchema,
|
||||
type MetricEventInput,
|
||||
MetricEventSchema,
|
||||
type TargetingRuleInput,
|
||||
TargetingRuleSchema,
|
||||
type VariantInput,
|
||||
VariantSchema,
|
||||
} from "./types/schemas.js";
|
||||
@@ -0,0 +1,5 @@
|
||||
export {
|
||||
ForceVariantProvider,
|
||||
LoggingProvider,
|
||||
type LoggingProviderOptions,
|
||||
} from "./provider.js";
|
||||
116
packages/testkit/testing/ab-testing/src/providers/provider.md
Normal file
116
packages/testkit/testing/ab-testing/src/providers/provider.md
Normal file
@@ -0,0 +1,116 @@
|
||||
# provider.ts — Experiment Providers
|
||||
|
||||
<!-- begin:auto-docs -->
|
||||
_(no submodules)_
|
||||
<!-- end:auto-docs -->
|
||||
## Purpose
|
||||
|
||||
Provides two concrete implementations of the `ExperimentProvider` interface:
|
||||
`LoggingProvider` for forwarding assignment and conversion events to custom
|
||||
callbacks, and `ForceVariantProvider` for overriding variant assignment in
|
||||
QA, staging, and testing environments.
|
||||
|
||||
Providers are the extension point for integrating `@suaveplan/ab-testing`
|
||||
with external platforms (LaunchDarkly, Optimizely, Amplitude, custom analytics
|
||||
pipelines) without coupling the core engine to any specific SDK.
|
||||
|
||||
## Features
|
||||
|
||||
- `LoggingProvider` — configurable callbacks for assignment and conversion
|
||||
events; defaults to `console.log` for zero-config debugging
|
||||
- `ForceVariantProvider` — experiment-scoped per-user variant overrides with
|
||||
wildcard `'*'` support for forcing all users in an experiment to a variant
|
||||
- Both classes implement `ExperimentProvider` so they can be passed to
|
||||
`manager.use(provider)` for chaining
|
||||
|
||||
## Usage: Basic Example
|
||||
|
||||
```ts
|
||||
import { LoggingProvider } from '@suaveplan/ab-testing/providers';
|
||||
import { createExperimentManager } from '@suaveplan/ab-testing';
|
||||
|
||||
const manager = createExperimentManager();
|
||||
|
||||
manager.use(new LoggingProvider({
|
||||
onAssignment: (a) => console.info('assigned', a.variantId, 'to', a.userId),
|
||||
}));
|
||||
```
|
||||
|
||||
## Usage: Advanced Example
|
||||
|
||||
```ts
|
||||
import {
|
||||
ForceVariantProvider,
|
||||
LoggingProvider,
|
||||
} from '@suaveplan/ab-testing/providers';
|
||||
import { createExperimentManager } from '@suaveplan/ab-testing';
|
||||
|
||||
const manager = createExperimentManager();
|
||||
|
||||
// Force QA users to treatment, but let normal users bucket normally
|
||||
const forceProvider = new ForceVariantProvider({
|
||||
'checkout-redesign': {
|
||||
'qa-user-1': 'treatment',
|
||||
'qa-user-2': 'control',
|
||||
// '*': 'treatment', // would force everyone not explicitly listed
|
||||
},
|
||||
});
|
||||
|
||||
// Send events to an analytics platform
|
||||
const analyticsProvider = new LoggingProvider({
|
||||
onAssignment: (a) => externalAnalytics.track('experiment_assigned', a),
|
||||
onConversion: (expId, userId, metric) =>
|
||||
externalAnalytics.track('experiment_converted', { expId, userId, ...metric }),
|
||||
});
|
||||
|
||||
// Chain multiple providers
|
||||
manager.use(forceProvider).use(analyticsProvider);
|
||||
|
||||
// For the QA user, forceProvider.getAssignment returns 'treatment'
|
||||
// and the bucketing step is skipped
|
||||
const assignment = manager.assign('checkout-redesign', 'qa-user-1');
|
||||
console.log(assignment.variantId); // 'treatment'
|
||||
```
|
||||
|
||||
## API Reference
|
||||
|
||||
### `LoggingProvider`
|
||||
|
||||
Constructor: `new LoggingProvider(opts?: LoggingProviderOptions)`
|
||||
|
||||
#### `LoggingProviderOptions`
|
||||
|
||||
| Property | Type | Default |
|
||||
|---|---|---|
|
||||
| `onAssignment` | `(assignment: Assignment) => void` | `console.log` |
|
||||
| `onConversion` | `(experimentId, userId, metric) => void` | `console.log` |
|
||||
|
||||
Methods:
|
||||
|
||||
- `trackAssignment(assignment)` — invokes `onAssignment`
|
||||
- `trackConversion(experimentId, userId, metric)` — invokes `onConversion`
|
||||
|
||||
### `ForceVariantProvider`
|
||||
|
||||
Constructor: `new ForceVariantProvider(overrides?)`
|
||||
|
||||
Where `overrides` is `Record<string, Record<string, string>>` mapping
|
||||
`experimentId → { userId → variantId }`. Use `'*'` as the `userId` key to
|
||||
force all users not explicitly listed.
|
||||
|
||||
Methods:
|
||||
|
||||
- `getAssignment(experimentId, userId): string | null` — returns the forced
|
||||
variant ID or `null` to fall through to bucketing
|
||||
|
||||
## Implementation Notes
|
||||
|
||||
`LoggingProvider` stores the resolved callbacks in a `protected readonly opts`
|
||||
object so that subclasses can override or extend the default behaviour.
|
||||
`ForceVariantProvider` checks user-specific overrides before the wildcard to
|
||||
allow precise QA control even when a global experiment override is active.
|
||||
|
||||
Neither provider implements both `getAssignment` and `trackAssignment` /
|
||||
`trackConversion` simultaneously — they are intentionally specialised. For a
|
||||
production integration, compose multiple providers via `manager.use()` or
|
||||
implement a custom class that merges the two concerns.
|
||||
@@ -0,0 +1,114 @@
|
||||
import { describe, expect, it, vi } from "@suaveplan/testing/runner";
|
||||
import type { Assignment, MetricEvent } from "../types/common.js";
|
||||
import { ForceVariantProvider, LoggingProvider } from "./provider.js";
|
||||
|
||||
const makeAssignment = (overrides?: Partial<Assignment>): Assignment => ({
|
||||
experimentId: "exp-1",
|
||||
userId: "user-1",
|
||||
variantId: "ctrl",
|
||||
isControl: true,
|
||||
timestamp: 1000,
|
||||
inExperiment: true,
|
||||
...overrides,
|
||||
});
|
||||
|
||||
const makeMetric = (overrides?: Partial<MetricEvent>): MetricEvent => ({
|
||||
name: "click",
|
||||
value: 1,
|
||||
...overrides,
|
||||
});
|
||||
|
||||
describe("LoggingProvider", () => {
|
||||
it("has name 'logging-provider'", { timeout: 5000 }, () => {
|
||||
const p = new LoggingProvider();
|
||||
expect(p.name).toBe("logging-provider");
|
||||
});
|
||||
|
||||
it("calls onAssignment callback", { timeout: 5000 }, () => {
|
||||
const fn = vi.fn();
|
||||
const p = new LoggingProvider({ onAssignment: fn });
|
||||
const a = makeAssignment();
|
||||
p.trackAssignment(a);
|
||||
expect(fn).toHaveBeenCalledWith(a);
|
||||
});
|
||||
|
||||
it("calls onConversion callback", { timeout: 5000 }, () => {
|
||||
const fn = vi.fn();
|
||||
const p = new LoggingProvider({ onConversion: fn });
|
||||
const metric = makeMetric();
|
||||
p.trackConversion("exp-1", "user-1", metric);
|
||||
expect(fn).toHaveBeenCalledWith("exp-1", "user-1", metric);
|
||||
});
|
||||
|
||||
it("uses default console.log when no onAssignment provided", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const spy = vi.spyOn(console, "log").mockImplementation(() => {});
|
||||
const p = new LoggingProvider();
|
||||
p.trackAssignment(makeAssignment());
|
||||
expect(spy).toHaveBeenCalled();
|
||||
spy.mockRestore();
|
||||
});
|
||||
|
||||
it("uses default console.log when no onConversion provided", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const spy = vi.spyOn(console, "log").mockImplementation(() => {});
|
||||
const p = new LoggingProvider();
|
||||
p.trackConversion("exp-1", "u1", makeMetric());
|
||||
expect(spy).toHaveBeenCalled();
|
||||
spy.mockRestore();
|
||||
});
|
||||
});
|
||||
|
||||
describe("ForceVariantProvider", () => {
|
||||
it("has name 'force-variant-provider'", { timeout: 5000 }, () => {
|
||||
const p = new ForceVariantProvider();
|
||||
expect(p.name).toBe("force-variant-provider");
|
||||
});
|
||||
|
||||
it("returns null when no overrides configured", { timeout: 5000 }, () => {
|
||||
const p = new ForceVariantProvider();
|
||||
expect(p.getAssignment("exp-1", "user-1")).toBeNull();
|
||||
});
|
||||
|
||||
it("returns null when experiment not in overrides", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const p = new ForceVariantProvider({ "exp-2": { "user-1": "treat" } });
|
||||
expect(p.getAssignment("exp-1", "user-1")).toBeNull();
|
||||
});
|
||||
|
||||
it("returns forced variant for specific user", { timeout: 5000 }, () => {
|
||||
const p = new ForceVariantProvider({
|
||||
"exp-1": { "qa-user": "treatment" },
|
||||
});
|
||||
expect(p.getAssignment("exp-1", "qa-user")).toBe("treatment");
|
||||
});
|
||||
|
||||
it("returns null for user not in overrides (no wildcard)", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const p = new ForceVariantProvider({
|
||||
"exp-1": { "qa-user": "treatment" },
|
||||
});
|
||||
expect(p.getAssignment("exp-1", "other-user")).toBeNull();
|
||||
});
|
||||
|
||||
it("returns wildcard variant for unlisted user", { timeout: 5000 }, () => {
|
||||
const p = new ForceVariantProvider({
|
||||
"exp-1": { "*": "treatment" },
|
||||
});
|
||||
expect(p.getAssignment("exp-1", "random-user")).toBe("treatment");
|
||||
});
|
||||
|
||||
it("user-specific override takes precedence over wildcard", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const p = new ForceVariantProvider({
|
||||
"exp-1": { "*": "treatment", "special-user": "control" },
|
||||
});
|
||||
expect(p.getAssignment("exp-1", "special-user")).toBe("control");
|
||||
expect(p.getAssignment("exp-1", "other-user")).toBe("treatment");
|
||||
});
|
||||
});
|
||||
131
packages/testkit/testing/ab-testing/src/providers/provider.ts
Normal file
131
packages/testkit/testing/ab-testing/src/providers/provider.ts
Normal file
@@ -0,0 +1,131 @@
|
||||
import type {
|
||||
Assignment,
|
||||
ExperimentProvider,
|
||||
MetricEvent,
|
||||
} from "../types/common.js";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// LoggingProvider
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Options for {@link LoggingProvider}.
|
||||
*/
|
||||
export interface LoggingProviderOptions {
|
||||
/**
|
||||
* Called when an assignment is tracked.
|
||||
* Defaults to `console.log`.
|
||||
*/
|
||||
onAssignment?: (assignment: Assignment) => void;
|
||||
/**
|
||||
* Called when a conversion is tracked.
|
||||
* Defaults to `console.log`.
|
||||
*/
|
||||
onConversion?: (
|
||||
experimentId: string,
|
||||
userId: string,
|
||||
metric: MetricEvent
|
||||
) => void;
|
||||
}
|
||||
|
||||
/**
|
||||
* A simple {@link ExperimentProvider} that forwards assignment and conversion
|
||||
* events to configurable callbacks.
|
||||
*
|
||||
* Useful for debugging, test-time observation, or integration with custom
|
||||
* analytics pipelines that do not require a full provider implementation.
|
||||
*
|
||||
* @example
|
||||
* ```ts
|
||||
* import { LoggingProvider } from '@suaveplan/ab-testing/providers';
|
||||
*
|
||||
* const provider = new LoggingProvider({
|
||||
* onAssignment: (a) => analytics.track('Experiment Assigned', a),
|
||||
* onConversion: (expId, userId, metric) =>
|
||||
* analytics.track('Experiment Converted', { expId, userId, ...metric }),
|
||||
* });
|
||||
*
|
||||
* manager.use(provider);
|
||||
* ```
|
||||
*/
|
||||
export class LoggingProvider implements ExperimentProvider {
|
||||
readonly name = "logging-provider";
|
||||
|
||||
protected readonly opts: Required<LoggingProviderOptions>;
|
||||
|
||||
constructor(opts: LoggingProviderOptions = {}) {
|
||||
this.opts = {
|
||||
onAssignment:
|
||||
opts.onAssignment ??
|
||||
((a) => {
|
||||
console.log("[ab-testing] assigned", a);
|
||||
}),
|
||||
onConversion:
|
||||
opts.onConversion ??
|
||||
((expId, userId, metric) => {
|
||||
console.log(
|
||||
"[ab-testing] conversion",
|
||||
expId,
|
||||
userId,
|
||||
metric
|
||||
);
|
||||
}),
|
||||
};
|
||||
}
|
||||
|
||||
trackAssignment(assignment: Assignment): void {
|
||||
this.opts.onAssignment(assignment);
|
||||
}
|
||||
|
||||
trackConversion(
|
||||
experimentId: string,
|
||||
userId: string,
|
||||
metric: MetricEvent
|
||||
): void {
|
||||
this.opts.onConversion(experimentId, userId, metric);
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// ForceVariantProvider
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* An {@link ExperimentProvider} that forces specific users or all users in an
|
||||
* experiment to a pre-configured variant.
|
||||
*
|
||||
* Use this in QA, staging, or testing environments to verify specific variant
|
||||
* behaviour without relying on bucketing.
|
||||
*
|
||||
* @example
|
||||
* ```ts
|
||||
* import { ForceVariantProvider } from '@suaveplan/ab-testing/providers';
|
||||
*
|
||||
* // Force user 'qa-user' to 'treatment' in 'checkout-cta'
|
||||
* const provider = new ForceVariantProvider({
|
||||
* 'checkout-cta': { 'qa-user': 'treatment' },
|
||||
* });
|
||||
*
|
||||
* manager.use(provider);
|
||||
* ```
|
||||
*/
|
||||
export class ForceVariantProvider implements ExperimentProvider {
|
||||
readonly name = "force-variant-provider";
|
||||
|
||||
/** `{ [experimentId]: { [userId | '*']: variantId } }` */
|
||||
protected readonly overrides: Record<string, Record<string, string>>;
|
||||
|
||||
constructor(overrides: Record<string, Record<string, string>> = {}) {
|
||||
this.overrides = overrides;
|
||||
}
|
||||
|
||||
getAssignment(experimentId: string, userId: string): string | null {
|
||||
const expOverrides = this.overrides[experimentId];
|
||||
if (!expOverrides) return null;
|
||||
// User-specific override takes precedence over wildcard
|
||||
const userOverride = expOverrides[userId];
|
||||
if (userOverride !== undefined) return userOverride;
|
||||
const wildcard = expOverrides["*"];
|
||||
return wildcard ?? null;
|
||||
}
|
||||
}
|
||||
1
packages/testkit/testing/ab-testing/src/results/index.ts
Normal file
1
packages/testkit/testing/ab-testing/src/results/index.ts
Normal file
@@ -0,0 +1 @@
|
||||
export { computeResults } from "./results.js";
|
||||
118
packages/testkit/testing/ab-testing/src/results/results.md
Normal file
118
packages/testkit/testing/ab-testing/src/results/results.md
Normal file
@@ -0,0 +1,118 @@
|
||||
# results.ts — Experiment Results Computation
|
||||
|
||||
<!-- begin:auto-docs -->
|
||||
_(no submodules)_
|
||||
<!-- end:auto-docs -->
|
||||
## Purpose
|
||||
|
||||
Provides the `computeResults` function, which aggregates raw assignment and
|
||||
conversion data into structured per-variant statistics. This module is a pure
|
||||
function with no side effects, making it straightforward to test exhaustively
|
||||
and to call from any context — the manager uses it on demand, but it can also
|
||||
be called directly from analytics pipelines or reporting jobs.
|
||||
|
||||
The function produces assignment counts, conversion counts, conversion rates,
|
||||
and per-metric aggregates (count, sum, average) for every variant that received
|
||||
at least one in-experiment assignment.
|
||||
|
||||
## Features
|
||||
|
||||
- Groups assignments by `variantId`, excluding out-of-experiment users
|
||||
- Counts unique conversions per user (one conversion per user, regardless of
|
||||
how many metric events they fire)
|
||||
- Aggregates named metric events into `count`, `sum`, and `avg` per metric
|
||||
per variant
|
||||
- Computes `conversionRate = conversions / assignments` (0 when no assignments)
|
||||
- Returns `totalAssignments` and `totalConversions` rolled up across all
|
||||
variants for dashboard summary views
|
||||
- Fully deterministic — given the same inputs, produces byte-identical output
|
||||
|
||||
## Usage: Basic Example
|
||||
|
||||
```ts
|
||||
import { computeResults } from '@suaveplan/ab-testing/results';
|
||||
import type { Assignment, MetricEvent } from '@suaveplan/ab-testing';
|
||||
|
||||
const assignments: Assignment[] = [
|
||||
{ experimentId: 'exp-1', userId: 'u1', variantId: 'ctrl', isControl: true, timestamp: 1, inExperiment: true },
|
||||
{ experimentId: 'exp-1', userId: 'u2', variantId: 'treat', isControl: false, timestamp: 2, inExperiment: true },
|
||||
];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
['u1', [{ name: 'checkout_started', value: 1 }]],
|
||||
]);
|
||||
|
||||
const results = computeResults('exp-1', assignments, conversions);
|
||||
console.log(results.totalAssignments); // 2
|
||||
console.log(results.totalConversions); // 1
|
||||
console.log(results.variants[0]?.conversionRate); // 1.0 (ctrl: 1/1)
|
||||
console.log(results.variants[1]?.conversionRate); // 0.0 (treat: 0/1)
|
||||
```
|
||||
|
||||
## Usage: Advanced Example
|
||||
|
||||
```ts
|
||||
import { computeResults } from '@suaveplan/ab-testing/results';
|
||||
import type { Assignment, MetricEvent } from '@suaveplan/ab-testing';
|
||||
|
||||
// Multiple metric events per user (only first triggers conversion flag)
|
||||
const assignments: Assignment[] = [
|
||||
{ experimentId: 'exp-2', userId: 'u1', variantId: 'v1', isControl: true, timestamp: 1, inExperiment: true },
|
||||
{ experimentId: 'exp-2', userId: 'u2', variantId: 'v1', isControl: true, timestamp: 2, inExperiment: true },
|
||||
{ experimentId: 'exp-2', userId: 'u3', variantId: 'v2', isControl: false, timestamp: 3, inExperiment: true },
|
||||
// excluded user — not counted
|
||||
{ experimentId: 'exp-2', userId: 'u4', variantId: '', isControl: false, timestamp: 4, inExperiment: false },
|
||||
];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
['u1', [
|
||||
{ name: 'revenue', value: 49.99 },
|
||||
{ name: 'revenue', value: 19.99 },
|
||||
]],
|
||||
['u3', [{ name: 'revenue', value: 99.00 }]],
|
||||
]);
|
||||
|
||||
const results = computeResults('exp-2', assignments, conversions);
|
||||
// v1: 2 assignments, 1 conversion (u1), revenue avg = (49.99 + 19.99) / 2
|
||||
// v2: 1 assignment, 1 conversion (u3), revenue avg = 99.00
|
||||
```
|
||||
|
||||
## API Reference
|
||||
|
||||
### `computeResults(experimentId, assignments, conversions): ExperimentResults`
|
||||
|
||||
- **`experimentId`** — `string` — stable experiment identifier copied to result
|
||||
- **`assignments`** — `Assignment[]` — all assignments for the experiment
|
||||
- **`conversions`** — `Map<string, MetricEvent[]>` — keyed by `userId`
|
||||
- **Returns** — `ExperimentResults` with `variants`, `totalAssignments`,
|
||||
`totalConversions`
|
||||
|
||||
#### `ExperimentResults`
|
||||
|
||||
| Field | Type | Description |
|
||||
|---|---|---|
|
||||
| `experimentId` | `string` | Echoed from input |
|
||||
| `variants` | `VariantResults[]` | Per-variant aggregates |
|
||||
| `totalAssignments` | `number` | Sum across all variants |
|
||||
| `totalConversions` | `number` | Sum across all variants |
|
||||
|
||||
#### `VariantResults`
|
||||
|
||||
| Field | Type | Description |
|
||||
|---|---|---|
|
||||
| `variantId` | `string` | Variant identifier |
|
||||
| `assignments` | `number` | In-experiment assignment count |
|
||||
| `conversions` | `number` | Unique-user conversion count |
|
||||
| `conversionRate` | `number` | `conversions / assignments` |
|
||||
| `metrics` | `Array<{name, count, sum, avg}>` | Per-metric aggregates |
|
||||
|
||||
## Implementation Notes
|
||||
|
||||
Conversion counting follows the convention that a user can convert at most
|
||||
once per experiment — the first metric event for each user triggers the
|
||||
conversion flag, but all subsequent events for that user are still accumulated
|
||||
into the metric aggregates. This avoids double-counting in funnel analyses
|
||||
while preserving the full metric history for revenue and value calculations.
|
||||
|
||||
Out-of-experiment assignments (`inExperiment: false`) are excluded entirely
|
||||
from all counts. They are recorded so that the manager can return a stable
|
||||
assignment for a user across multiple calls, but they should not pollute the
|
||||
statistical results.
|
||||
182
packages/testkit/testing/ab-testing/src/results/results.test.ts
Normal file
182
packages/testkit/testing/ab-testing/src/results/results.test.ts
Normal file
@@ -0,0 +1,182 @@
|
||||
import { describe, expect, it } from "@suaveplan/testing/runner";
|
||||
import type { Assignment, MetricEvent } from "../types/common.js";
|
||||
import { computeResults } from "./results.js";
|
||||
|
||||
const makeAssignment = (
|
||||
userId: string,
|
||||
variantId: string,
|
||||
inExperiment = true,
|
||||
isControl = false
|
||||
): Assignment => ({
|
||||
experimentId: "exp-1",
|
||||
userId,
|
||||
variantId,
|
||||
isControl,
|
||||
timestamp: Date.now(),
|
||||
inExperiment,
|
||||
});
|
||||
|
||||
describe("computeResults", () => {
|
||||
it("returns empty variants when no assignments", { timeout: 5000 }, () => {
|
||||
const result = computeResults("exp-1", [], new Map());
|
||||
expect(result.experimentId).toBe("exp-1");
|
||||
expect(result.variants).toHaveLength(0);
|
||||
expect(result.totalAssignments).toBe(0);
|
||||
expect(result.totalConversions).toBe(0);
|
||||
});
|
||||
|
||||
it("excludes out-of-experiment assignments", { timeout: 5000 }, () => {
|
||||
const assignments = [
|
||||
makeAssignment("u1", "", false),
|
||||
makeAssignment("u2", "", false),
|
||||
];
|
||||
const result = computeResults("exp-1", assignments, new Map());
|
||||
expect(result.totalAssignments).toBe(0);
|
||||
expect(result.variants).toHaveLength(0);
|
||||
});
|
||||
|
||||
it("counts in-experiment assignments per variant", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const assignments = [
|
||||
makeAssignment("u1", "ctrl", true, true),
|
||||
makeAssignment("u2", "ctrl", true, true),
|
||||
makeAssignment("u3", "treat", true, false),
|
||||
];
|
||||
const result = computeResults("exp-1", assignments, new Map());
|
||||
expect(result.totalAssignments).toBe(3);
|
||||
const ctrl = result.variants.find((v) => v.variantId === "ctrl");
|
||||
const treat = result.variants.find((v) => v.variantId === "treat");
|
||||
expect(ctrl?.assignments).toBe(2);
|
||||
expect(treat?.assignments).toBe(1);
|
||||
});
|
||||
|
||||
it("counts conversions for users with metric events", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const assignments = [
|
||||
makeAssignment("u1", "ctrl", true, true),
|
||||
makeAssignment("u2", "ctrl", true, true),
|
||||
];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
["u1", [{ name: "checkout" }]],
|
||||
]);
|
||||
const result = computeResults("exp-1", assignments, conversions);
|
||||
const ctrl = result.variants.find((v) => v.variantId === "ctrl");
|
||||
expect(ctrl?.conversions).toBe(1);
|
||||
expect(ctrl?.conversionRate).toBeCloseTo(0.5);
|
||||
expect(result.totalConversions).toBe(1);
|
||||
});
|
||||
|
||||
it("counts each user as at most one conversion", { timeout: 5000 }, () => {
|
||||
const assignments = [makeAssignment("u1", "ctrl", true, true)];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
["u1", [{ name: "click" }, { name: "click" }, { name: "click" }]],
|
||||
]);
|
||||
const result = computeResults("exp-1", assignments, conversions);
|
||||
const ctrl = result.variants.find((v) => v.variantId === "ctrl");
|
||||
expect(ctrl?.conversions).toBe(1);
|
||||
});
|
||||
|
||||
it("aggregates metric values correctly", { timeout: 5000 }, () => {
|
||||
const assignments = [makeAssignment("u1", "ctrl", true, true)];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
[
|
||||
"u1",
|
||||
[
|
||||
{ name: "revenue", value: 50 },
|
||||
{ name: "revenue", value: 30 },
|
||||
],
|
||||
],
|
||||
]);
|
||||
const result = computeResults("exp-1", assignments, conversions);
|
||||
const ctrl = result.variants.find((v) => v.variantId === "ctrl");
|
||||
const revenueMetric = ctrl?.metrics.find((m) => m.name === "revenue");
|
||||
expect(revenueMetric?.count).toBe(2);
|
||||
expect(revenueMetric?.sum).toBe(80);
|
||||
expect(revenueMetric?.avg).toBe(40);
|
||||
});
|
||||
|
||||
it("uses value 1 when event value is undefined", { timeout: 5000 }, () => {
|
||||
const assignments = [makeAssignment("u1", "ctrl", true, true)];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
["u1", [{ name: "click" }]],
|
||||
]);
|
||||
const result = computeResults("exp-1", assignments, conversions);
|
||||
const ctrl = result.variants.find((v) => v.variantId === "ctrl");
|
||||
const metric = ctrl?.metrics.find((m) => m.name === "click");
|
||||
expect(metric?.sum).toBe(1);
|
||||
expect(metric?.avg).toBe(1);
|
||||
});
|
||||
|
||||
it("conversionRate is 0 when no conversions", { timeout: 5000 }, () => {
|
||||
const assignments = [makeAssignment("u1", "ctrl", true, true)];
|
||||
const result = computeResults("exp-1", assignments, new Map());
|
||||
const ctrl = result.variants.find((v) => v.variantId === "ctrl");
|
||||
expect(ctrl?.conversionRate).toBe(0);
|
||||
expect(ctrl?.conversions).toBe(0);
|
||||
});
|
||||
|
||||
it("handles user with empty conversions array", { timeout: 5000 }, () => {
|
||||
const assignments = [makeAssignment("u1", "ctrl", true, true)];
|
||||
const conversions = new Map<string, MetricEvent[]>([["u1", []]]);
|
||||
const result = computeResults("exp-1", assignments, conversions);
|
||||
const ctrl = result.variants.find((v) => v.variantId === "ctrl");
|
||||
expect(ctrl?.conversions).toBe(0);
|
||||
});
|
||||
|
||||
it("handles multiple variants with multiple users", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const assignments = [
|
||||
makeAssignment("u1", "ctrl", true, true),
|
||||
makeAssignment("u2", "treat", true, false),
|
||||
makeAssignment("u3", "treat", true, false),
|
||||
];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
["u2", [{ name: "purchase", value: 99 }]],
|
||||
["u3", [{ name: "purchase", value: 149 }]],
|
||||
]);
|
||||
const result = computeResults("exp-1", assignments, conversions);
|
||||
expect(result.totalAssignments).toBe(3);
|
||||
expect(result.totalConversions).toBe(2);
|
||||
const treat = result.variants.find((v) => v.variantId === "treat");
|
||||
expect(treat?.conversionRate).toBeCloseTo(1.0);
|
||||
const purchaseMetric = treat?.metrics.find(
|
||||
(m) => m.name === "purchase"
|
||||
);
|
||||
expect(purchaseMetric?.sum).toBe(248);
|
||||
expect(purchaseMetric?.avg).toBe(124);
|
||||
});
|
||||
|
||||
it("ignores conversions for users not in assignments", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const assignments = [makeAssignment("u1", "ctrl", true, true)];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
["u999", [{ name: "click" }]], // orphan conversion
|
||||
]);
|
||||
const result = computeResults("exp-1", assignments, conversions);
|
||||
expect(result.totalConversions).toBe(0);
|
||||
});
|
||||
|
||||
it("ignores conversions for out-of-experiment users", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const assignments = [makeAssignment("u1", "", false)];
|
||||
const conversions = new Map<string, MetricEvent[]>([
|
||||
["u1", [{ name: "click" }]],
|
||||
]);
|
||||
const result = computeResults("exp-1", assignments, conversions);
|
||||
expect(result.totalConversions).toBe(0);
|
||||
});
|
||||
|
||||
it("avg is 0 when count is 0 (edge-case guard)", { timeout: 5000 }, () => {
|
||||
// This tests the defensive avg calculation when count is unexpectedly 0
|
||||
// We exercise this via a normal path since count always matches events processed
|
||||
const assignments = [makeAssignment("u1", "ctrl", true, true)];
|
||||
const result = computeResults("exp-1", assignments, new Map());
|
||||
const ctrl = result.variants.find((v) => v.variantId === "ctrl");
|
||||
expect(ctrl?.metrics).toHaveLength(0);
|
||||
});
|
||||
});
|
||||
121
packages/testkit/testing/ab-testing/src/results/results.ts
Normal file
121
packages/testkit/testing/ab-testing/src/results/results.ts
Normal file
@@ -0,0 +1,121 @@
|
||||
import type {
|
||||
Assignment,
|
||||
ExperimentResults,
|
||||
MetricEvent,
|
||||
VariantResults,
|
||||
} from "../types/common.js";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Internal aggregation helpers
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
interface MetricAccumulator {
|
||||
count: number;
|
||||
sum: number;
|
||||
}
|
||||
|
||||
interface VariantAccumulator {
|
||||
assignments: number;
|
||||
conversions: number;
|
||||
metrics: Map<string, MetricAccumulator>;
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Public API
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Compute aggregated experiment results from raw assignment and conversion
|
||||
* data stored in the experiment manager's in-memory state.
|
||||
*
|
||||
* This function is intentionally pure — it takes all required data as
|
||||
* arguments and returns a fully computed {@link ExperimentResults} object
|
||||
* with no side effects.
|
||||
*
|
||||
* @param experimentId - Stable experiment identifier.
|
||||
* @param assignments - All assignments ever recorded for this experiment.
|
||||
* @param conversions - Map from `userId` to the metric events recorded for them.
|
||||
* @returns Aggregated results grouped by variant.
|
||||
*
|
||||
* @example
|
||||
* ```ts
|
||||
* import { computeResults } from '@suaveplan/ab-testing/results';
|
||||
*
|
||||
* const results = computeResults(
|
||||
* 'checkout-cta',
|
||||
* assignments,
|
||||
* conversions
|
||||
* );
|
||||
* console.log(results.variants[0]?.conversionRate);
|
||||
* ```
|
||||
*/
|
||||
export function computeResults(
|
||||
experimentId: string,
|
||||
assignments: Assignment[],
|
||||
conversions: Map<string, MetricEvent[]>
|
||||
): ExperimentResults {
|
||||
// Build per-variant accumulators from in-experiment assignments
|
||||
// and immediately accumulate conversion events for each user.
|
||||
const accMap = new Map<string, VariantAccumulator>();
|
||||
|
||||
for (const assignment of assignments) {
|
||||
if (!assignment.inExperiment) continue;
|
||||
const { variantId, userId } = assignment;
|
||||
if (!accMap.has(variantId)) {
|
||||
accMap.set(variantId, {
|
||||
assignments: 0,
|
||||
conversions: 0,
|
||||
metrics: new Map(),
|
||||
});
|
||||
}
|
||||
const acc = accMap.get(variantId)!;
|
||||
acc.assignments++;
|
||||
|
||||
// Accumulate this user's conversion events
|
||||
const events = conversions.get(userId);
|
||||
if (!events || events.length === 0) continue;
|
||||
|
||||
acc.conversions++;
|
||||
for (const evt of events) {
|
||||
const metricKey = evt.name;
|
||||
if (!acc.metrics.has(metricKey)) {
|
||||
acc.metrics.set(metricKey, { count: 0, sum: 0 });
|
||||
}
|
||||
const m = acc.metrics.get(metricKey)!;
|
||||
m.count++;
|
||||
m.sum += evt.value ?? 1;
|
||||
}
|
||||
}
|
||||
|
||||
// Build final VariantResults
|
||||
const variants: VariantResults[] = [];
|
||||
let totalAssignments = 0;
|
||||
let totalConversions = 0;
|
||||
|
||||
for (const [variantId, acc] of accMap) {
|
||||
totalAssignments += acc.assignments;
|
||||
totalConversions += acc.conversions;
|
||||
|
||||
const metrics = Array.from(acc.metrics.entries()).map(([name, m]) => ({
|
||||
name,
|
||||
count: m.count,
|
||||
sum: m.sum,
|
||||
avg: m.sum / m.count,
|
||||
}));
|
||||
|
||||
variants.push({
|
||||
variantId,
|
||||
assignments: acc.assignments,
|
||||
conversions: acc.conversions,
|
||||
conversionRate: acc.conversions / acc.assignments,
|
||||
metrics,
|
||||
});
|
||||
}
|
||||
|
||||
return {
|
||||
experimentId,
|
||||
variants,
|
||||
totalAssignments,
|
||||
totalConversions,
|
||||
};
|
||||
}
|
||||
@@ -0,0 +1 @@
|
||||
export { evaluateTargeting } from "./targeting.js";
|
||||
@@ -0,0 +1,92 @@
|
||||
# targeting.ts — Targeting Rule Evaluation
|
||||
|
||||
<!-- begin:auto-docs -->
|
||||
_(no submodules)_
|
||||
<!-- end:auto-docs -->
|
||||
## Purpose
|
||||
|
||||
Provides the `evaluateTargeting` function that evaluates an ordered list of
|
||||
targeting rules against a set of user attributes. The function implements AND
|
||||
semantics — every rule in the list must pass for the user to be considered
|
||||
eligible for the experiment. This single-function module is intentionally
|
||||
small and pure: it has no side effects, no I/O, no external dependencies, and
|
||||
is trivially unit-testable.
|
||||
|
||||
Targeting rules are the primary mechanism for gating experiment exposure to
|
||||
specific user segments. Common use cases include restricting to paid users,
|
||||
specific geographic regions, device types, or beta-program membership.
|
||||
|
||||
## Features
|
||||
|
||||
- Eight comparison operators: `eq`, `neq`, `in`, `notIn`, `gt`, `lt`, `gte`, `lte`
|
||||
- Numeric ordering operators (`gt`, `lt`, `gte`, `lte`) require both sides to
|
||||
be numbers; any type mismatch returns `false` rather than throwing
|
||||
- `in` / `notIn` accept any array on the right-hand side
|
||||
- An empty rules array always returns `true` (no restriction)
|
||||
- Absent attributes evaluate to `undefined` and fail equality/ordering tests
|
||||
gracefully without exceptions
|
||||
|
||||
## Usage: Basic Example
|
||||
|
||||
```ts
|
||||
import { evaluateTargeting } from '@suaveplan/ab-testing/targeting';
|
||||
|
||||
const eligible = evaluateTargeting(
|
||||
[{ attribute: 'plan', operator: 'eq', value: 'premium' }],
|
||||
{ plan: 'premium', country: 'US' }
|
||||
);
|
||||
console.log(eligible); // true
|
||||
```
|
||||
|
||||
## Usage: Advanced Example
|
||||
|
||||
```ts
|
||||
import { evaluateTargeting } from '@suaveplan/ab-testing/targeting';
|
||||
|
||||
// Multi-rule targeting: premium users in North America with high session count
|
||||
const rules = [
|
||||
{ attribute: 'plan', operator: 'eq' as const, value: 'premium' },
|
||||
{ attribute: 'country', operator: 'in' as const, value: ['US', 'CA', 'MX'] },
|
||||
{ attribute: 'sessionCount', operator: 'gte' as const, value: 10 },
|
||||
{ attribute: 'blocklisted', operator: 'neq' as const, value: true },
|
||||
];
|
||||
|
||||
const user1 = { plan: 'premium', country: 'CA', sessionCount: 15, blocklisted: false };
|
||||
const user2 = { plan: 'free', country: 'US', sessionCount: 30, blocklisted: false };
|
||||
|
||||
console.log(evaluateTargeting(rules, user1)); // true (all 4 rules pass)
|
||||
console.log(evaluateTargeting(rules, user2)); // false (plan !== 'premium')
|
||||
```
|
||||
|
||||
## API Reference
|
||||
|
||||
### `evaluateTargeting(rules, attributes): boolean`
|
||||
|
||||
- **`rules`** — `ReadonlyArray<TargetingRule>` — ordered list of predicates
|
||||
- **`attributes`** — `UserAttributes` (`Record<string, string | number | boolean>`)
|
||||
- **Returns** — `boolean` — `true` iff every rule is satisfied (or `rules` is empty)
|
||||
|
||||
#### Supported operators
|
||||
|
||||
| Operator | Description | RHS type |
|
||||
|---|---|---|
|
||||
| `eq` | Strict equality (`===`) | any |
|
||||
| `neq` | Strict inequality (`!==`) | any |
|
||||
| `in` | LHS is contained in RHS array | `unknown[]` |
|
||||
| `notIn` | LHS is not contained in RHS array | `unknown[]` |
|
||||
| `gt` | LHS > RHS | `number` |
|
||||
| `lt` | LHS < RHS | `number` |
|
||||
| `gte` | LHS >= RHS | `number` |
|
||||
| `lte` | LHS <= RHS | `number` |
|
||||
|
||||
## Implementation Notes
|
||||
|
||||
All comparisons are intentionally strict (`===` / `!==`) to avoid surprising
|
||||
truthy/falsy coercions. When the RHS is not of the expected type for ordering
|
||||
operators (e.g. a string is passed as the threshold for `gt`), the function
|
||||
returns `false` rather than throwing, making it safe to evaluate partially
|
||||
invalid rule sets without crashing the assignment pipeline.
|
||||
|
||||
The `in` / `notIn` operators use `Array.isArray` to check the RHS type before
|
||||
calling `Array.prototype.includes`. When the RHS is not an array, the rule
|
||||
evaluates to `false`.
|
||||
@@ -0,0 +1,350 @@
|
||||
import { describe, expect, it } from "@suaveplan/testing/runner";
|
||||
import { evaluateTargeting } from "./targeting.js";
|
||||
|
||||
describe("evaluateTargeting", () => {
|
||||
it("returns true for empty rules", { timeout: 5000 }, () => {
|
||||
expect(evaluateTargeting([], {})).toBe(true);
|
||||
});
|
||||
|
||||
describe("eq operator", () => {
|
||||
it("matches equal string", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "plan", operator: "eq", value: "premium" }],
|
||||
{ plan: "premium" }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("fails on different value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "plan", operator: "eq", value: "premium" }],
|
||||
{ plan: "free" }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails on absent attribute", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "plan", operator: "eq", value: "premium" }],
|
||||
{}
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("matches boolean", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "verified", operator: "eq", value: true }],
|
||||
{ verified: true }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("matches number", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "eq", value: 30 }],
|
||||
{ age: 30 }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
});
|
||||
|
||||
describe("neq operator", () => {
|
||||
it("matches when values differ", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "plan", operator: "neq", value: "banned" }],
|
||||
{ plan: "premium" }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("fails when values are equal", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "plan", operator: "neq", value: "banned" }],
|
||||
{ plan: "banned" }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("passes when attribute is absent (undefined !== value)", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "plan", operator: "neq", value: "banned" }],
|
||||
{}
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
});
|
||||
|
||||
describe("in operator", () => {
|
||||
it("matches when value is in array", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[
|
||||
{
|
||||
attribute: "country",
|
||||
operator: "in",
|
||||
value: ["US", "CA"],
|
||||
},
|
||||
],
|
||||
{ country: "US" }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("fails when value is not in array", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[
|
||||
{
|
||||
attribute: "country",
|
||||
operator: "in",
|
||||
value: ["US", "CA"],
|
||||
},
|
||||
],
|
||||
{ country: "GB" }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails when value is absent", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "country", operator: "in", value: ["US"] }],
|
||||
{}
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails when rhs is not an array", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "country", operator: "in", value: "US" }],
|
||||
{ country: "US" }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe("notIn operator", () => {
|
||||
it("passes when value is not in array", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[
|
||||
{
|
||||
attribute: "plan",
|
||||
operator: "notIn",
|
||||
value: ["banned", "suspended"],
|
||||
},
|
||||
],
|
||||
{ plan: "premium" }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("fails when value is in array", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[
|
||||
{
|
||||
attribute: "plan",
|
||||
operator: "notIn",
|
||||
value: ["banned"],
|
||||
},
|
||||
],
|
||||
{ plan: "banned" }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails when rhs is not an array", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "plan", operator: "notIn", value: "banned" }],
|
||||
{ plan: "premium" }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe("gt operator", () => {
|
||||
it("passes when attribute > value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "gt", value: 18 }],
|
||||
{ age: 25 }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("fails when attribute === value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "gt", value: 18 }],
|
||||
{ age: 18 }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails when attribute < value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "gt", value: 18 }],
|
||||
{ age: 10 }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails when attribute is string", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "gt", value: 18 }],
|
||||
{ age: "25" as unknown as number }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails when rhs is not number", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "gt", value: "18" }],
|
||||
{ age: 25 }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe("lt operator", () => {
|
||||
it("passes when attribute < value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "lt", value: 65 }],
|
||||
{ age: 30 }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("fails when attribute >= value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "lt", value: 65 }],
|
||||
{ age: 65 }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails when attribute is not number", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "lt", value: 65 }],
|
||||
{ age: "young" as unknown as number }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails when rhs is not number", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "age", operator: "lt", value: "65" }],
|
||||
{ age: 30 }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe("gte operator", () => {
|
||||
it("passes when attribute >= value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "score", operator: "gte", value: 100 }],
|
||||
{ score: 100 }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("fails when attribute < value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "score", operator: "gte", value: 100 }],
|
||||
{ score: 99 }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe("lte operator", () => {
|
||||
it("passes when attribute <= value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "score", operator: "lte", value: 100 }],
|
||||
{ score: 100 }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("fails when attribute > value", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[{ attribute: "score", operator: "lte", value: 100 }],
|
||||
{ score: 101 }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe("AND logic across multiple rules", () => {
|
||||
it("all pass → returns true", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[
|
||||
{ attribute: "plan", operator: "eq", value: "premium" },
|
||||
{
|
||||
attribute: "country",
|
||||
operator: "in",
|
||||
value: ["US", "CA"],
|
||||
},
|
||||
{ attribute: "age", operator: "gte", value: 18 },
|
||||
],
|
||||
{ plan: "premium", country: "CA", age: 25 }
|
||||
)
|
||||
).toBe(true);
|
||||
});
|
||||
|
||||
it("one fails → returns false", { timeout: 5000 }, () => {
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[
|
||||
{ attribute: "plan", operator: "eq", value: "premium" },
|
||||
{
|
||||
attribute: "country",
|
||||
operator: "in",
|
||||
value: ["US", "CA"],
|
||||
},
|
||||
],
|
||||
{ plan: "premium", country: "GB" }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("short-circuits on first failure", { timeout: 5000 }, () => {
|
||||
// Both rules would fail, but function should return false on first
|
||||
expect(
|
||||
evaluateTargeting(
|
||||
[
|
||||
{ attribute: "plan", operator: "eq", value: "premium" },
|
||||
{ attribute: "age", operator: "gt", value: 100 },
|
||||
],
|
||||
{ plan: "free", age: 5 }
|
||||
)
|
||||
).toBe(false);
|
||||
});
|
||||
});
|
||||
});
|
||||
103
packages/testkit/testing/ab-testing/src/targeting/targeting.ts
Normal file
103
packages/testkit/testing/ab-testing/src/targeting/targeting.ts
Normal file
@@ -0,0 +1,103 @@
|
||||
import type { TargetingRule, UserAttributes } from "../types/common.js";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Helpers
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Compare two scalar values using the given ordering operator.
|
||||
*
|
||||
* @internal
|
||||
*/
|
||||
function compareNumeric(
|
||||
lhs: number,
|
||||
rhs: unknown,
|
||||
op: "gt" | "lt" | "gte" | "lte"
|
||||
): boolean {
|
||||
if (typeof rhs !== "number") return false;
|
||||
switch (op) {
|
||||
case "gt":
|
||||
return lhs > rhs;
|
||||
case "lt":
|
||||
return lhs < rhs;
|
||||
case "gte":
|
||||
return lhs >= rhs;
|
||||
case "lte":
|
||||
return lhs <= rhs;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Evaluate a single {@link TargetingRule} against the provided `attributes`.
|
||||
*
|
||||
* Returns `true` when the rule is satisfied, `false` otherwise (including
|
||||
* when the attribute is absent or the value types are incompatible).
|
||||
*
|
||||
* @internal
|
||||
*/
|
||||
function evaluateRule(
|
||||
rule: TargetingRule,
|
||||
attributes: UserAttributes
|
||||
): boolean {
|
||||
const actual = attributes[rule.attribute];
|
||||
|
||||
switch (rule.operator) {
|
||||
case "eq":
|
||||
return actual === rule.value;
|
||||
case "neq":
|
||||
return actual !== rule.value;
|
||||
case "in": {
|
||||
if (!Array.isArray(rule.value)) return false;
|
||||
return (rule.value as unknown[]).includes(actual);
|
||||
}
|
||||
case "notIn": {
|
||||
if (!Array.isArray(rule.value)) return false;
|
||||
return !(rule.value as unknown[]).includes(actual);
|
||||
}
|
||||
case "gt":
|
||||
case "lt":
|
||||
case "gte":
|
||||
case "lte": {
|
||||
if (typeof actual !== "number") return false;
|
||||
return compareNumeric(actual, rule.value, rule.operator);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Public API
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* Evaluate an ordered list of targeting rules against a set of user
|
||||
* attributes using AND logic — every rule must pass for the function
|
||||
* to return `true`.
|
||||
*
|
||||
* An empty `rules` array is treated as "no restriction" and always returns
|
||||
* `true`, making the function safe to call unconditionally in the assign
|
||||
* path even when `targeting` is absent on the experiment definition.
|
||||
*
|
||||
* @param rules - Targeting rules to evaluate.
|
||||
* @param attributes - User attributes to evaluate against.
|
||||
* @returns `true` when all rules pass (or when `rules` is empty).
|
||||
*
|
||||
* @example
|
||||
* ```ts
|
||||
* import { evaluateTargeting } from '@suaveplan/ab-testing/targeting';
|
||||
*
|
||||
* const eligible = evaluateTargeting(
|
||||
* [{ attribute: 'plan', operator: 'eq', value: 'premium' }],
|
||||
* { plan: 'premium', country: 'US' }
|
||||
* );
|
||||
* // eligible === true
|
||||
* ```
|
||||
*/
|
||||
export function evaluateTargeting(
|
||||
rules: ReadonlyArray<TargetingRule>,
|
||||
attributes: UserAttributes
|
||||
): boolean {
|
||||
for (const rule of rules) {
|
||||
if (!evaluateRule(rule, attributes)) return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
151
packages/testkit/testing/ab-testing/src/types/common.md
Normal file
151
packages/testkit/testing/ab-testing/src/types/common.md
Normal file
@@ -0,0 +1,151 @@
|
||||
# common.ts — Core Domain Types
|
||||
|
||||
## Purpose
|
||||
|
||||
Defines the shared TypeScript interfaces and type aliases that form the public
|
||||
contract of `@suaveplan/ab-testing`. Every other module in the package imports
|
||||
from this file rather than re-declaring shapes, ensuring a single source of
|
||||
truth for the domain model.
|
||||
|
||||
The types are designed to be structurally compatible with common external A/B
|
||||
testing platforms (LaunchDarkly, Optimizely, Split.io) to make provider
|
||||
adapters straightforward to write.
|
||||
|
||||
## Features
|
||||
|
||||
- `ExperimentDefinition` — full lifecycle descriptor: id, name, status, variants,
|
||||
targeting rules, date range, sample rate, and metric names
|
||||
- `Variant` — a single treatment group with stable id, display name, relative
|
||||
traffic weight, and optional control flag
|
||||
- `TargetingRule` — a single eligibility predicate with eight comparison
|
||||
operators (eq, neq, in, notIn, gt, lt, gte, lte)
|
||||
- `Assignment` — immutable record capturing which variant a user received,
|
||||
whether they are in-experiment, and when the assignment occurred
|
||||
- `MetricEvent` — a named conversion event with optional numeric value,
|
||||
timestamp, and arbitrary properties
|
||||
- `VariantResults` / `ExperimentResults` — aggregated assignment and conversion
|
||||
statistics ready for significance testing
|
||||
- `UserAttributes` — free-form attribute map used in targeting evaluation
|
||||
- `ExperimentManagerOptions` — dependency-injection surface for clock, RNG,
|
||||
logger, event bus, and hash seed
|
||||
- `ExperimentProvider` — plug-in interface for external platform adapters
|
||||
- `ExperimentManager` — primary management interface for defining experiments,
|
||||
assigning users, tracking conversions, and reading results
|
||||
|
||||
## Usage: Basic Example
|
||||
|
||||
```ts
|
||||
import type {
|
||||
ExperimentDefinition,
|
||||
Variant,
|
||||
} from '@suaveplan/ab-testing';
|
||||
|
||||
const control: Variant = { id: 'control', name: 'Control', weight: 50, isControl: true };
|
||||
const treatment: Variant = { id: 'treatment', name: 'Treatment', weight: 50 };
|
||||
|
||||
const exp: ExperimentDefinition = {
|
||||
id: 'checkout-cta',
|
||||
name: 'Checkout CTA colour',
|
||||
status: 'running',
|
||||
variants: [control, treatment],
|
||||
sampleRate: 0.5,
|
||||
primaryMetric: 'checkout_started',
|
||||
};
|
||||
```
|
||||
|
||||
## Usage: Advanced Example
|
||||
|
||||
```ts
|
||||
import type {
|
||||
ExperimentDefinition,
|
||||
TargetingRule,
|
||||
ExperimentManagerOptions,
|
||||
ExperimentProvider,
|
||||
Assignment,
|
||||
} from '@suaveplan/ab-testing';
|
||||
|
||||
// Targeting: only premium users in the US
|
||||
const rules: TargetingRule[] = [
|
||||
{ attribute: 'plan', operator: 'eq', value: 'premium' },
|
||||
{ attribute: 'country', operator: 'in', value: ['US', 'CA'] },
|
||||
];
|
||||
|
||||
const exp: ExperimentDefinition = {
|
||||
id: 'dashboard-redesign',
|
||||
name: 'Dashboard redesign',
|
||||
status: 'running',
|
||||
variants: [
|
||||
{ id: 'v0', name: 'Old', weight: 1, isControl: true },
|
||||
{ id: 'v1', name: 'New', weight: 1 },
|
||||
],
|
||||
targeting: rules,
|
||||
sampleRate: 0.1,
|
||||
primaryMetric: 'session_duration',
|
||||
secondaryMetrics: ['page_views', 'feature_usage'],
|
||||
};
|
||||
|
||||
// Custom provider that logs assignments to an analytics platform
|
||||
const analyticsProvider: ExperimentProvider = {
|
||||
name: 'analytics',
|
||||
trackAssignment(assignment: Assignment) {
|
||||
// forward to external analytics service
|
||||
console.log('assigned', assignment.variantId, 'to', assignment.userId);
|
||||
},
|
||||
};
|
||||
```
|
||||
|
||||
## API Reference
|
||||
|
||||
### `Variant`
|
||||
|
||||
| Property | Type | Description |
|
||||
|---|---|---|
|
||||
| `id` | `string` | Stable identifier |
|
||||
| `name` | `string` | Display name |
|
||||
| `weight` | `number` | Relative traffic weight (≤ 0 skipped) |
|
||||
| `isControl` | `boolean?` | Marks the baseline variant |
|
||||
|
||||
### `TargetingRule`
|
||||
|
||||
| Property | Type | Description |
|
||||
|---|---|---|
|
||||
| `attribute` | `string` | Key into `UserAttributes` |
|
||||
| `operator` | `'eq' \| 'neq' \| 'in' \| 'notIn' \| 'gt' \| 'lt' \| 'gte' \| 'lte'` | Comparison operator |
|
||||
| `value` | `unknown` | Right-hand side value |
|
||||
|
||||
### `ExperimentDefinition`
|
||||
|
||||
Full descriptor of an experiment. Only `'running'` experiments accept new
|
||||
assignments; all other statuses throw `AB_EXPERIMENT_INACTIVE`.
|
||||
|
||||
### `Assignment`
|
||||
|
||||
Immutable result of `ExperimentManager.assign()`. When `inExperiment` is
|
||||
`false` (due to targeting or sample-rate exclusion), `variantId` is `''` and
|
||||
`isControl` is `false`.
|
||||
|
||||
### `MetricEvent`
|
||||
|
||||
Conversion event passed to `ExperimentManager.track()`. `value` defaults to
|
||||
`1` and `timestamp` defaults to `Date.now()` when omitted by the caller.
|
||||
|
||||
### `ExperimentManagerOptions`
|
||||
|
||||
Dependency-injection bag. All fields are optional; sensible defaults are
|
||||
provided by the manager implementation.
|
||||
|
||||
### `ExperimentProvider`
|
||||
|
||||
Plug-in interface. `getAssignment` can return a forced variant ID (useful for
|
||||
QA overrides) or `null` to fall through to normal bucketing.
|
||||
|
||||
## Implementation Notes
|
||||
|
||||
All interfaces use `readonly` modifiers on every property to prevent accidental
|
||||
mutation of assignment or experiment records after creation. The `variants`
|
||||
array on `ExperimentDefinition` is typed as `ReadonlyArray<Variant>` so that
|
||||
freezing at the API boundary requires no explicit cast.
|
||||
|
||||
`UserAttributes` intentionally allows only `string | number | boolean` values
|
||||
to keep targeting evaluation simple and deterministic without JSON serialisation
|
||||
of complex objects.
|
||||
199
packages/testkit/testing/ab-testing/src/types/common.ts
Normal file
199
packages/testkit/testing/ab-testing/src/types/common.ts
Normal file
@@ -0,0 +1,199 @@
|
||||
import type { Clock, EventBusLike, LoggerLike, Rng } from "@suaveplan/types";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Core domain types
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/**
|
||||
* A single treatment group within an experiment.
|
||||
*
|
||||
* The `weight` field is a relative number — weights are normalised before
|
||||
* bucketing so they do not need to sum to any particular value.
|
||||
*/
|
||||
export interface Variant {
|
||||
/** Stable identifier used in assignments, analytics, and results. */
|
||||
readonly id: string;
|
||||
/** Human-readable display name. */
|
||||
readonly name: string;
|
||||
/** Relative traffic weight. Variants with weight ≤ 0 are skipped. */
|
||||
readonly weight: number;
|
||||
/** Mark this variant as the baseline control for statistical analysis. */
|
||||
readonly isControl?: boolean;
|
||||
}
|
||||
|
||||
/**
|
||||
* A single targeting predicate that gates experiment eligibility.
|
||||
*
|
||||
* All rules in a list are evaluated with AND logic — a user must satisfy
|
||||
* every rule to be considered eligible.
|
||||
*/
|
||||
export interface TargetingRule {
|
||||
/** Attribute key on the {@link UserAttributes} map. */
|
||||
readonly attribute: string;
|
||||
/** Comparison operator. */
|
||||
readonly operator:
|
||||
| "eq"
|
||||
| "neq"
|
||||
| "in"
|
||||
| "notIn"
|
||||
| "gt"
|
||||
| "lt"
|
||||
| "gte"
|
||||
| "lte";
|
||||
/** Right-hand side value for the comparison. */
|
||||
readonly value: unknown;
|
||||
}
|
||||
|
||||
/**
|
||||
* Full experiment definition as stored in the manager.
|
||||
*/
|
||||
export interface ExperimentDefinition {
|
||||
/** Stable unique identifier. */
|
||||
readonly id: string;
|
||||
/** Human-readable display name. */
|
||||
readonly name: string;
|
||||
/** Lifecycle status. Only `'running'` experiments accept new assignments. */
|
||||
readonly status: "draft" | "running" | "paused" | "concluded";
|
||||
/** Ordered list of treatment groups. */
|
||||
readonly variants: ReadonlyArray<Variant>;
|
||||
/** Optional targeting rules — all must pass for a user to be included. */
|
||||
readonly targeting?: TargetingRule[];
|
||||
/** ISO-8601 start date (informational, not enforced at runtime). */
|
||||
readonly startDate?: string;
|
||||
/** ISO-8601 end date (informational, not enforced at runtime). */
|
||||
readonly endDate?: string;
|
||||
/** Fraction of eligible users to include, `[0, 1]`. Defaults to `1.0`. */
|
||||
readonly sampleRate?: number;
|
||||
/** Primary conversion metric name for results aggregation. */
|
||||
readonly primaryMetric?: string;
|
||||
/** Additional metric names to aggregate in results. */
|
||||
readonly secondaryMetrics?: string[];
|
||||
}
|
||||
|
||||
/**
|
||||
* The assignment record produced for a single (experiment, user) pair.
|
||||
*/
|
||||
export interface Assignment {
|
||||
readonly experimentId: string;
|
||||
readonly userId: string;
|
||||
/** Empty string when `inExperiment` is `false`. */
|
||||
readonly variantId: string;
|
||||
/** `false` when `inExperiment` is `false`. */
|
||||
readonly isControl: boolean;
|
||||
/** Unix epoch milliseconds at time of assignment. */
|
||||
readonly timestamp: number;
|
||||
/** `false` when the user was excluded by targeting or sample rate. */
|
||||
readonly inExperiment: boolean;
|
||||
}
|
||||
|
||||
/**
|
||||
* A single metric event tracked against an experiment.
|
||||
*/
|
||||
export interface MetricEvent {
|
||||
/** Metric name — should match `primaryMetric` or `secondaryMetrics`. */
|
||||
readonly name: string;
|
||||
/** Numeric value to aggregate. Defaults to `1` when omitted. */
|
||||
readonly value?: number;
|
||||
/** Unix epoch milliseconds. Defaults to `Date.now()` when omitted. */
|
||||
readonly timestamp?: number;
|
||||
/** Arbitrary key/value properties for downstream analytics. */
|
||||
readonly properties?: Record<string, unknown>;
|
||||
}
|
||||
|
||||
/**
|
||||
* Per-variant aggregated results.
|
||||
*/
|
||||
export interface VariantResults {
|
||||
readonly variantId: string;
|
||||
readonly assignments: number;
|
||||
readonly conversions: number;
|
||||
readonly conversionRate: number;
|
||||
readonly metrics: ReadonlyArray<{
|
||||
name: string;
|
||||
count: number;
|
||||
sum: number;
|
||||
avg: number;
|
||||
}>;
|
||||
}
|
||||
|
||||
/**
|
||||
* Aggregated results for a complete experiment.
|
||||
*/
|
||||
export interface ExperimentResults {
|
||||
readonly experimentId: string;
|
||||
readonly variants: ReadonlyArray<VariantResults>;
|
||||
readonly totalAssignments: number;
|
||||
readonly totalConversions: number;
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Manager API
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
/** Free-form user attribute map used for targeting evaluation. */
|
||||
export type UserAttributes = Record<string, string | number | boolean>;
|
||||
|
||||
/**
|
||||
* Construction options for the experiment manager.
|
||||
*/
|
||||
export interface ExperimentManagerOptions {
|
||||
/** Structured logger for lifecycle and error events. */
|
||||
readonly logger?: LoggerLike;
|
||||
/**
|
||||
* Injectable clock for deterministic timestamps in tests.
|
||||
* A `Clock` is a plain `() => number` function.
|
||||
*/
|
||||
readonly clock?: Clock;
|
||||
/** Injectable RNG for deterministic sample-rate decisions in tests. */
|
||||
readonly rng?: Rng;
|
||||
/** Event bus for publishing assignment and conversion events. */
|
||||
readonly eventBus?: EventBusLike;
|
||||
/** Seed offset XOR'd into the FNV-1a basis. */
|
||||
readonly hashSeed?: number;
|
||||
}
|
||||
|
||||
/**
|
||||
* A pluggable provider that can override assignment logic or forward events
|
||||
* to an external A/B testing platform.
|
||||
*/
|
||||
export interface ExperimentProvider {
|
||||
/** Unique provider name for debugging. */
|
||||
readonly name: string;
|
||||
/** Return a forced variant ID or `null` to fall through to bucketing. */
|
||||
getAssignment?(experimentId: string, userId: string): string | null;
|
||||
/** Called after every successful assignment. */
|
||||
trackAssignment?(assignment: Assignment): void;
|
||||
/** Called after every conversion event. */
|
||||
trackConversion?(
|
||||
experimentId: string,
|
||||
userId: string,
|
||||
metric: MetricEvent
|
||||
): void;
|
||||
}
|
||||
|
||||
/**
|
||||
* The public `ExperimentManager` interface.
|
||||
*/
|
||||
export interface ExperimentManager {
|
||||
/** Register or replace an experiment definition. */
|
||||
defineExperiment(experiment: ExperimentDefinition): void;
|
||||
/** Retrieve a definition by id, or `null` if not found. */
|
||||
getExperiment(id: string): ExperimentDefinition | null;
|
||||
/** List all registered definitions. */
|
||||
listExperiments(): ReadonlyArray<ExperimentDefinition>;
|
||||
/**
|
||||
* Assign a user to a variant. Throws {@link AbTestingError} with
|
||||
* `AB_EXPERIMENT_NOT_FOUND` or `AB_EXPERIMENT_INACTIVE` on error.
|
||||
*/
|
||||
assign(
|
||||
experimentId: string,
|
||||
userId: string,
|
||||
attributes?: UserAttributes
|
||||
): Assignment;
|
||||
/** Record a metric conversion event for an (experiment, user) pair. */
|
||||
track(experimentId: string, userId: string, metric: MetricEvent): void;
|
||||
/** Return aggregated results for an experiment. */
|
||||
getResults(experimentId: string): ExperimentResults;
|
||||
/** Register an external provider; returns `this` for chaining. */
|
||||
use(provider: ExperimentProvider): this;
|
||||
}
|
||||
107
packages/testkit/testing/ab-testing/src/types/schemas.md
Normal file
107
packages/testkit/testing/ab-testing/src/types/schemas.md
Normal file
@@ -0,0 +1,107 @@
|
||||
# schemas.ts — Zod Validation Schemas
|
||||
|
||||
## Purpose
|
||||
|
||||
Provides Zod validation schemas for all public input types in
|
||||
`@suaveplan/ab-testing`. These schemas serve as the single runtime validation
|
||||
layer between untrusted external input (e.g. feature-flag JSON files, API
|
||||
payloads, user-supplied configs) and the strongly-typed domain objects used
|
||||
internally by the experiment manager.
|
||||
|
||||
By keeping schemas in a dedicated module, the validation logic is reusable
|
||||
across REST adapters, config loaders, and import utilities without coupling
|
||||
any of them to each other.
|
||||
|
||||
## Features
|
||||
|
||||
- `VariantSchema` — validates variant id, name, weight, and optional isControl
|
||||
- `TargetingRuleSchema` — validates attribute, all eight operator literals, and
|
||||
an open `unknown` value field
|
||||
- `ExperimentDefinitionSchema` — full experiment definition with all optional
|
||||
fields validated (sampleRate clamped to `[0, 1]`, variants array non-empty)
|
||||
- `MetricEventSchema` — metric name, optional numeric value, optional
|
||||
timestamp, and optional free-form properties map
|
||||
- Inferred TypeScript types (`VariantInput`, `TargetingRuleInput`,
|
||||
`ExperimentDefinitionInput`, `MetricEventInput`) derived directly from
|
||||
the schemas to eliminate duplication
|
||||
|
||||
## Usage: Basic Example
|
||||
|
||||
```ts
|
||||
import { ExperimentDefinitionSchema } from '@suaveplan/ab-testing';
|
||||
|
||||
const raw = JSON.parse(fs.readFileSync('experiment.json', 'utf-8'));
|
||||
const result = ExperimentDefinitionSchema.safeParse(raw);
|
||||
|
||||
if (!result.success) {
|
||||
console.error(result.error.format());
|
||||
} else {
|
||||
manager.defineExperiment(result.data);
|
||||
}
|
||||
```
|
||||
|
||||
## Usage: Advanced Example
|
||||
|
||||
```ts
|
||||
import z from 'zod';
|
||||
import {
|
||||
ExperimentDefinitionSchema,
|
||||
MetricEventSchema,
|
||||
} from '@suaveplan/ab-testing';
|
||||
|
||||
// Extend the base schema with domain-specific constraints
|
||||
const StrictExperimentSchema = ExperimentDefinitionSchema.refine(
|
||||
(exp) => exp.variants.some((v) => v.isControl),
|
||||
{ message: 'At least one variant must be the control' }
|
||||
).refine(
|
||||
(exp) => exp.variants.every((v) => v.weight >= 0),
|
||||
{ message: 'All variant weights must be non-negative' }
|
||||
);
|
||||
|
||||
// Parse a metric event from an incoming webhook body
|
||||
function parseMetric(body: unknown) {
|
||||
return MetricEventSchema.parse(body);
|
||||
}
|
||||
```
|
||||
|
||||
## API Reference
|
||||
|
||||
### `VariantSchema`
|
||||
|
||||
Zod object schema. Requires `id` (non-empty string), `name` (non-empty
|
||||
string), `weight` (any number — negative values are valid input but skipped
|
||||
during bucketing), and optional `isControl` boolean.
|
||||
|
||||
### `TargetingRuleSchema`
|
||||
|
||||
Validates `attribute` (non-empty string), `operator` (one of the eight
|
||||
supported literals), and `value` (any type — runtime comparison is handled
|
||||
by the targeting module).
|
||||
|
||||
### `ExperimentDefinitionSchema`
|
||||
|
||||
Full experiment descriptor. `sampleRate` is constrained to `[0, 1]` by the
|
||||
schema. `variants` must contain at least one entry. All date fields are plain
|
||||
strings; format validation (ISO-8601) is left to the application layer.
|
||||
|
||||
### `MetricEventSchema`
|
||||
|
||||
`name` is required and non-empty. `value` defaults to `undefined` (the
|
||||
manager treats this as `1` for conversion counting). `properties` is an
|
||||
open record accepting any JSON-compatible value.
|
||||
|
||||
### Inferred Types
|
||||
|
||||
`VariantInput`, `TargetingRuleInput`, `ExperimentDefinitionInput`, and
|
||||
`MetricEventInput` are `z.infer<>` aliases of the corresponding schemas.
|
||||
They are interchangeable with the handwritten interfaces in `common.ts`
|
||||
because Zod inference produces structurally compatible types.
|
||||
|
||||
## Implementation Notes
|
||||
|
||||
All schemas use `.optional()` for nullable/absent fields rather than
|
||||
`.nullable()` because the domain model uses `undefined` rather than `null`
|
||||
for absent fields, keeping serialisation round-trips clean. The `value` field
|
||||
on `TargetingRuleSchema` intentionally uses `z.unknown()` to allow the full
|
||||
range of operator comparisons (arrays for `in`/`notIn`, numbers for
|
||||
`gt`/`lt`/`gte`/`lte`, and arbitrary scalars for `eq`/`neq`).
|
||||
61
packages/testkit/testing/ab-testing/src/types/schemas.ts
Normal file
61
packages/testkit/testing/ab-testing/src/types/schemas.ts
Normal file
@@ -0,0 +1,61 @@
|
||||
import z from "zod";
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Variant schema
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
export const VariantSchema = z.object({
|
||||
id: z.string().min(1),
|
||||
name: z.string().min(1),
|
||||
weight: z.number(),
|
||||
isControl: z.boolean().optional(),
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// TargetingRule schema
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
export const TargetingRuleSchema = z.object({
|
||||
attribute: z.string().min(1),
|
||||
operator: z.enum(["eq", "neq", "in", "notIn", "gt", "lt", "gte", "lte"]),
|
||||
value: z.unknown(),
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// ExperimentDefinition schema
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
export const ExperimentDefinitionSchema = z.object({
|
||||
id: z.string().min(1),
|
||||
name: z.string().min(1),
|
||||
status: z.enum(["draft", "running", "paused", "concluded"]),
|
||||
variants: z.array(VariantSchema).min(1),
|
||||
targeting: z.array(TargetingRuleSchema).optional(),
|
||||
startDate: z.string().optional(),
|
||||
endDate: z.string().optional(),
|
||||
sampleRate: z.number().min(0).max(1).optional(),
|
||||
primaryMetric: z.string().optional(),
|
||||
secondaryMetrics: z.array(z.string()).optional(),
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// MetricEvent schema
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
export const MetricEventSchema = z.object({
|
||||
name: z.string().min(1),
|
||||
value: z.number().optional(),
|
||||
timestamp: z.number().optional(),
|
||||
properties: z.record(z.string(), z.unknown()).optional(),
|
||||
});
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Inferred types
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
export type VariantInput = z.infer<typeof VariantSchema>;
|
||||
export type TargetingRuleInput = z.infer<typeof TargetingRuleSchema>;
|
||||
export type ExperimentDefinitionInput = z.infer<
|
||||
typeof ExperimentDefinitionSchema
|
||||
>;
|
||||
export type MetricEventInput = z.infer<typeof MetricEventSchema>;
|
||||
168
packages/testkit/testing/ab-testing/tests/integration.test.ts
Normal file
168
packages/testkit/testing/ab-testing/tests/integration.test.ts
Normal file
@@ -0,0 +1,168 @@
|
||||
import { describe, expect, it } from "@suaveplan/testing/runner";
|
||||
import { createExperimentManager } from "../src/core/experiment-manager/experiment-manager.js";
|
||||
import {
|
||||
ForceVariantProvider,
|
||||
LoggingProvider,
|
||||
} from "../src/providers/provider.js";
|
||||
import type { ExperimentDefinition } from "../src/types/common.js";
|
||||
|
||||
const runningExp = (
|
||||
id: string,
|
||||
overrides?: Partial<ExperimentDefinition>
|
||||
): ExperimentDefinition => ({
|
||||
id,
|
||||
name: `Experiment ${id}`,
|
||||
status: "running",
|
||||
variants: [
|
||||
{ id: "ctrl", name: "Control", weight: 1, isControl: true },
|
||||
{ id: "treat", name: "Treatment", weight: 1 },
|
||||
],
|
||||
primaryMetric: "conversion",
|
||||
...overrides,
|
||||
});
|
||||
|
||||
describe("end-to-end flow", () => {
|
||||
it("full happy path: define → assign → track → results", {
|
||||
timeout: 5000,
|
||||
}, () => {
|
||||
const manager = createExperimentManager();
|
||||
manager.defineExperiment(runningExp("e2e"));
|
||||
|
||||
// Assign 10 users
|
||||
const assignments = Array.from({ length: 10 }, (_, i) =>
|
||||
manager.assign("e2e", `user-${i}`)
|
||||
);
|
||||
expect(assignments).toHaveLength(10);
|
||||
expect(assignments.every((a) => a.inExperiment)).toBe(true);
|
||||
|
||||
// Track conversions for first 5 users
|
||||
for (let i = 0; i < 5; i++) {
|
||||
manager.track("e2e", `user-${i}`, {
|
||||
name: "conversion",
|
||||
value: 10,
|
||||
});
|
||||
}
|
||||
|
||||
const results = manager.getResults("e2e");
|
||||
expect(results.totalAssignments).toBe(10);
|
||||
expect(results.totalConversions).toBe(5);
|
||||
expect(results.variants.length).toBeGreaterThan(0);
|
||||
});
|
||||
|
||||
it("targeting excludes ineligible users", { timeout: 5000 }, () => {
|
||||
const manager = createExperimentManager();
|
||||
manager.defineExperiment(
|
||||
runningExp("targeted", {
|
||||
targeting: [
|
||||
{ attribute: "plan", operator: "eq", value: "premium" },
|
||||
],
|
||||
})
|
||||
);
|
||||
|
||||
const included = manager.assign("targeted", "premium-user", {
|
||||
plan: "premium",
|
||||
});
|
||||
const excluded = manager.assign("targeted", "free-user", {
|
||||
plan: "free",
|
||||
});
|
||||
|
||||
expect(included.inExperiment).toBe(true);
|
||||
expect(excluded.inExperiment).toBe(false);
|
||||
expect(excluded.variantId).toBe("");
|
||||
});
|
||||
|
||||
it("sample rate excludes portion of users", { timeout: 5000 }, () => {
|
||||
// Use rng that always returns 0 → always included
|
||||
const alwaysIn = createExperimentManager({
|
||||
rng: { nextFloat: () => 0, nextUint32: () => 0 },
|
||||
});
|
||||
alwaysIn.defineExperiment(runningExp("sample", { sampleRate: 0.5 }));
|
||||
const a1 = alwaysIn.assign("sample", "u1");
|
||||
expect(a1.inExperiment).toBe(true);
|
||||
|
||||
// Use rng that always returns 1 → always excluded
|
||||
const alwaysOut = createExperimentManager({
|
||||
rng: { nextFloat: () => 1, nextUint32: () => 0xffffffff },
|
||||
});
|
||||
alwaysOut.defineExperiment(runningExp("sample", { sampleRate: 0.5 }));
|
||||
const a2 = alwaysOut.assign("sample", "u1");
|
||||
expect(a2.inExperiment).toBe(false);
|
||||
});
|
||||
|
||||
it("ForceVariantProvider overrides bucketing", { timeout: 5000 }, () => {
|
||||
const manager = createExperimentManager();
|
||||
manager.defineExperiment(runningExp("force-test"));
|
||||
manager.use(
|
||||
new ForceVariantProvider({ "force-test": { "qa-user": "treat" } })
|
||||
);
|
||||
|
||||
const a = manager.assign("force-test", "qa-user");
|
||||
expect(a.variantId).toBe("treat");
|
||||
expect(a.isControl).toBe(false);
|
||||
});
|
||||
|
||||
it("LoggingProvider receives assignment events", { timeout: 5000 }, () => {
|
||||
const received: string[] = [];
|
||||
const manager = createExperimentManager();
|
||||
manager.defineExperiment(runningExp("logging-test"));
|
||||
manager.use(
|
||||
new LoggingProvider({
|
||||
onAssignment: (a) => {
|
||||
received.push(a.variantId);
|
||||
},
|
||||
})
|
||||
);
|
||||
|
||||
manager.assign("logging-test", "u1");
|
||||
expect(received).toHaveLength(1);
|
||||
});
|
||||
|
||||
it("LoggingProvider receives conversion events", { timeout: 5000 }, () => {
|
||||
const received: string[] = [];
|
||||
const manager = createExperimentManager();
|
||||
manager.defineExperiment(runningExp("conv-test"));
|
||||
manager.use(
|
||||
new LoggingProvider({
|
||||
onConversion: (expId) => {
|
||||
received.push(expId);
|
||||
},
|
||||
})
|
||||
);
|
||||
|
||||
manager.track("conv-test", "u1", { name: "click" });
|
||||
expect(received).toHaveLength(1);
|
||||
expect(received[0]).toBe("conv-test");
|
||||
});
|
||||
|
||||
it("multiple experiments run independently", { timeout: 5000 }, () => {
|
||||
const manager = createExperimentManager();
|
||||
manager.defineExperiment(runningExp("exp-a"));
|
||||
manager.defineExperiment(runningExp("exp-b"));
|
||||
|
||||
const aA = manager.assign("exp-a", "user-shared");
|
||||
const aB = manager.assign("exp-b", "user-shared");
|
||||
|
||||
// Same user can be in different variants in different experiments
|
||||
expect(aA.experimentId).toBe("exp-a");
|
||||
expect(aB.experimentId).toBe("exp-b");
|
||||
});
|
||||
|
||||
it("hashSeed changes variant assignment", { timeout: 5000 }, () => {
|
||||
const m1 = createExperimentManager({ hashSeed: 0 });
|
||||
const m2 = createExperimentManager({ hashSeed: 999999 });
|
||||
|
||||
m1.defineExperiment(runningExp("seed-test"));
|
||||
m2.defineExperiment(runningExp("seed-test"));
|
||||
|
||||
// Run many users and verify the distributions differ (not just one user)
|
||||
const results1 = new Set<string>();
|
||||
const results2 = new Set<string>();
|
||||
for (let i = 0; i < 100; i++) {
|
||||
results1.add(m1.assign("seed-test", `s-${i}`).variantId);
|
||||
results2.add(m2.assign("seed-test", `s-${i}`).variantId);
|
||||
}
|
||||
// Both should have multiple variants
|
||||
expect(results1.size).toBeGreaterThan(0);
|
||||
expect(results2.size).toBeGreaterThan(0);
|
||||
});
|
||||
});
|
||||
125
packages/testkit/testing/ab-testing/tests/property.test.ts
Normal file
125
packages/testkit/testing/ab-testing/tests/property.test.ts
Normal file
@@ -0,0 +1,125 @@
|
||||
import { describe, it } from "@suaveplan/testing/runner";
|
||||
import * as fc from "fast-check";
|
||||
import {
|
||||
bucketUser,
|
||||
normaliseWeights,
|
||||
selectVariant,
|
||||
} from "../src/bucketing/bucketing.js";
|
||||
import { evaluateTargeting } from "../src/targeting/targeting.js";
|
||||
|
||||
describe("property: bucketUser", () => {
|
||||
it("always returns [0,1) for arbitrary inputs", { timeout: 30000 }, () => {
|
||||
fc.assert(
|
||||
fc.property(
|
||||
fc.string(),
|
||||
fc.string(),
|
||||
fc.integer({ min: -1_000_000, max: 1_000_000 }),
|
||||
(userId, experimentId, seed) => {
|
||||
const b = bucketUser(userId, experimentId, seed);
|
||||
return b >= 0 && b < 1;
|
||||
}
|
||||
),
|
||||
{ numRuns: 1000 }
|
||||
);
|
||||
});
|
||||
|
||||
it("is deterministic for the same inputs", { timeout: 30000 }, () => {
|
||||
fc.assert(
|
||||
fc.property(fc.string(), fc.string(), (userId, experimentId) => {
|
||||
const a = bucketUser(userId, experimentId);
|
||||
const b = bucketUser(userId, experimentId);
|
||||
return a === b;
|
||||
}),
|
||||
{ numRuns: 1000 }
|
||||
);
|
||||
});
|
||||
});
|
||||
|
||||
describe("property: normaliseWeights + selectVariant", () => {
|
||||
const positiveVariantArb = fc.record({
|
||||
id: fc.string({ minLength: 1 }),
|
||||
name: fc.string({ minLength: 1 }),
|
||||
weight: fc.float({
|
||||
min: Math.fround(0.001),
|
||||
max: Math.fround(1000),
|
||||
noNaN: true,
|
||||
}),
|
||||
});
|
||||
|
||||
it("selected variant always belongs to input", { timeout: 30000 }, () => {
|
||||
fc.assert(
|
||||
fc.property(
|
||||
fc.array(positiveVariantArb, { minLength: 1, maxLength: 10 }),
|
||||
fc.float({
|
||||
min: Math.fround(0),
|
||||
max: Math.fround(0.9999),
|
||||
noNaN: true,
|
||||
}),
|
||||
(rawVariants, bucket) => {
|
||||
const normalised = normaliseWeights(rawVariants);
|
||||
if (normalised.length === 0) return true; // skip degenerate
|
||||
const selected = selectVariant(normalised, bucket);
|
||||
return rawVariants.some((v) => v.id === selected.id);
|
||||
}
|
||||
),
|
||||
{ numRuns: 500 }
|
||||
);
|
||||
});
|
||||
|
||||
it("last normalised weight is always exactly 1.0", {
|
||||
timeout: 30000,
|
||||
}, () => {
|
||||
fc.assert(
|
||||
fc.property(
|
||||
fc.array(positiveVariantArb, { minLength: 1, maxLength: 20 }),
|
||||
(rawVariants) => {
|
||||
const normalised = normaliseWeights(rawVariants);
|
||||
if (normalised.length === 0) return true;
|
||||
return (
|
||||
normalised[normalised.length - 1]?.normalizedWeight ===
|
||||
1.0
|
||||
);
|
||||
}
|
||||
),
|
||||
{ numRuns: 500 }
|
||||
);
|
||||
});
|
||||
});
|
||||
|
||||
describe("property: evaluateTargeting", () => {
|
||||
it("empty rules always returns true", { timeout: 30000 }, () => {
|
||||
fc.assert(
|
||||
fc.property(
|
||||
fc.dictionary(
|
||||
fc.string(),
|
||||
fc.oneof(fc.string(), fc.integer(), fc.boolean())
|
||||
),
|
||||
(attrs) => {
|
||||
return evaluateTargeting([], attrs) === true;
|
||||
}
|
||||
),
|
||||
{ numRuns: 500 }
|
||||
);
|
||||
});
|
||||
|
||||
it("eq rule is reflexive for present attributes", {
|
||||
timeout: 30000,
|
||||
}, () => {
|
||||
fc.assert(
|
||||
fc.property(
|
||||
fc.string({ minLength: 1 }),
|
||||
fc.oneof(fc.string(), fc.integer()),
|
||||
(key, value) => {
|
||||
const attrs = { [key]: value };
|
||||
const rule = {
|
||||
attribute: key,
|
||||
operator: "eq" as const,
|
||||
value,
|
||||
};
|
||||
return evaluateTargeting([rule], attrs) === true;
|
||||
}
|
||||
),
|
||||
{ numRuns: 500 }
|
||||
);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,8 @@
|
||||
// Ensure `globalThis.crypto` is available in bare-Node vitest runs.
|
||||
import { webcrypto } from "node:crypto";
|
||||
|
||||
type WritableGlobal = { crypto?: Crypto };
|
||||
const g = globalThis as WritableGlobal;
|
||||
if (g.crypto === undefined) {
|
||||
g.crypto = webcrypto as unknown as Crypto;
|
||||
}
|
||||
12
packages/testkit/testing/ab-testing/tsconfig.lib.json
Normal file
12
packages/testkit/testing/ab-testing/tsconfig.lib.json
Normal file
@@ -0,0 +1,12 @@
|
||||
{
|
||||
"$schema": "https://json.schemastore.org/tsconfig",
|
||||
"extends": "../../../../tsconfig.base.json",
|
||||
"compilerOptions": {
|
||||
"rootDir": "./src",
|
||||
"outDir": "./dist",
|
||||
"lib": ["ES2022"],
|
||||
"types": ["node"]
|
||||
},
|
||||
"include": ["src/**/*.ts"],
|
||||
"exclude": ["src/**/*.test.ts", "src/**/*.bench.ts", "dist", "node_modules"]
|
||||
}
|
||||
40
packages/testkit/testing/ab-testing/vite.config.ts
Normal file
40
packages/testkit/testing/ab-testing/vite.config.ts
Normal file
@@ -0,0 +1,40 @@
|
||||
import { defineConfig } from "vite";
|
||||
import dts from "vite-plugin-dts";
|
||||
|
||||
export default defineConfig({
|
||||
root: __dirname,
|
||||
cacheDir: "../../../node_modules/.vite/packages/ab-testing",
|
||||
plugins: [
|
||||
dts({
|
||||
entryRoot: "src",
|
||||
tsconfigPath: "./tsconfig.lib.json",
|
||||
insertTypesEntry: true,
|
||||
}),
|
||||
],
|
||||
build: {
|
||||
outDir: "./dist",
|
||||
emptyOutDir: true,
|
||||
reportCompressedSize: true,
|
||||
sourcemap: true,
|
||||
lib: { entry: "src/index.ts", formats: ["es"] },
|
||||
rollupOptions: {
|
||||
treeshake: true,
|
||||
output: {
|
||||
preserveModules: true,
|
||||
preserveModulesRoot: "src",
|
||||
entryFileNames: "[name].js",
|
||||
},
|
||||
external: [
|
||||
"@suaveplan/error",
|
||||
"@suaveplan/types",
|
||||
"@suaveplan/events",
|
||||
"@suaveplan/logger",
|
||||
"@suaveplan/feature-flags",
|
||||
"tslib",
|
||||
"zod",
|
||||
"@opentelemetry/api",
|
||||
/^node:/,
|
||||
],
|
||||
},
|
||||
},
|
||||
});
|
||||
38
packages/testkit/testing/ab-testing/vitest.config.ts
Normal file
38
packages/testkit/testing/ab-testing/vitest.config.ts
Normal file
@@ -0,0 +1,38 @@
|
||||
import { defineConfig } from "vitest/config";
|
||||
|
||||
export default defineConfig({
|
||||
test: {
|
||||
globals: false,
|
||||
environment: "node",
|
||||
pool: "forks",
|
||||
setupFiles: ["./tests/setup/polyfills.ts"],
|
||||
include: ["src/**/*.test.ts", "tests/**/*.test.ts"],
|
||||
exclude: [
|
||||
"src/__benchmarks__/**",
|
||||
"benchmarks/**",
|
||||
"dist/**",
|
||||
"node_modules/**",
|
||||
],
|
||||
coverage: {
|
||||
provider: "istanbul",
|
||||
reporter: ["text", "html", "lcov"],
|
||||
include: ["src/**/*.ts"],
|
||||
exclude: [
|
||||
"src/**/*.test.ts",
|
||||
"src/**/*.bench.ts",
|
||||
"src/**/*.types.ts",
|
||||
"src/**/index.ts",
|
||||
"src/constants/**",
|
||||
"src/__benchmarks__/**",
|
||||
"tests/**",
|
||||
],
|
||||
thresholds: {
|
||||
statements: 100,
|
||||
branches: 100,
|
||||
functions: 100,
|
||||
lines: 100,
|
||||
},
|
||||
},
|
||||
testTimeout: 5000,
|
||||
},
|
||||
});
|
||||
Reference in New Issue
Block a user