Initial Commit

packages/media/audio/audio-analysis-beat/tests/property.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import fc from "fast-check";
+import { BeatDetector } from "../src/detector/beat-detector.js";
+import { makeMetronome } from "./fixtures.js";
+
+describe("property — analyze results are well-formed", () => {
+    it("beats and onsets are strictly increasing and confidence is in [0,1]", {
+        timeout: 30000,
+    }, async () => {
+        await fc.assert(
+            fc.asyncProperty(
+                fc.integer({ min: 80, max: 160 }),
+                fc.integer({ min: 4, max: 6 }),
+                async (bpm, durationSeconds) => {
+                    const doc = makeMetronome({ bpm, durationSeconds });
+                    const r = await new BeatDetector().analyze(doc);
+                    expect(r.confidence).toBeGreaterThanOrEqual(0);
+                    expect(r.confidence).toBeLessThanOrEqual(1);
+                    for (let i = 1; i < r.beats.length; i++) {
+                        expect(r.beats[i]).toBeGreaterThan(r.beats[i - 1]!);
+                    }
+                    for (let i = 1; i < r.onsets.length; i++) {
+                        expect(r.onsets[i]).toBeGreaterThan(r.onsets[i - 1]!);
+                    }
+                    expect(r.bpm).toBeGreaterThanOrEqual(60);
+                    expect(r.bpm).toBeLessThanOrEqual(200);
+                }
+            ),
+            { numRuns: 3 }
+        );
+    });
+});