Capability Spec Delta: testing (2026-04-27-testing-runner-subpath)

Package: @suaveplan/testing Status: PROPOSED

ADDED Requirements

Requirement: Central runner subpath

The package SHALL expose a ./runner subpath that re-exports the active test runner's primitives (describe, it, test, expect, expectTypeOf, vi, beforeAll/beforeEach/afterAll/afterEach) together with generic mock helpers (fn, spy, stub, mock, fakeClock, restoreMocks, restoreTimers) and runner-neutral types (RunnerMock<TArgs, TReturn>, SpyHandle). The subpath SHALL resolve to the vitest implementation by default and to bun:test under the bun package.json condition, so consumers swap runners without changing imports.

Scenario: vitest path re-exports primitives

WHEN a consumer imports describe, it, expect, vi, expectTypeOf from @suaveplan/testing/runner under the default or vitest condition
THEN the imports resolve to the corresponding vitest exports

Scenario: bun-test path re-exports primitives with `expectTypeOf` shim

WHEN a consumer imports the same surface under the bun condition
THEN describe/it/expect/vi resolve to bun:test equivalents and expectTypeOf resolves to a Proxy-backed no-op chain whose calls succeed (type assertions are erased at compile time)

Scenario: generic mock helpers preserve call signature

WHEN a test calls fn<[string], number>() from the subpath
THEN the returned RunnerMock<[string], number> is callable as (arg: string) => number under both the vitest and bun-test paths

Verified by: src/runner/mocks.test.ts::"creates a mock that records calls" AND src/runner/runner.spec-conformance.test.ts::"fn<[string], number>() preserves call-signature typing" AND src/runner/runner.spec-conformance.test.ts::"BunRunnerMock<TArgs, TReturn> shape mirrors the vitest path"

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