Initial Commit

packages/media/audio/midi/tests/property.test.ts

@@ -0,0 +1,130 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import fc from "fast-check";
+import { decodeMessage } from "../src/message/decode.js";
+import { encodeMessage } from "../src/message/encode.js";
+import type { MidiMessage } from "../src/message/message.types.js";
+
+const channel = fc.integer({ min: 0, max: 15 });
+const data7 = fc.integer({ min: 0, max: 127 });
+const data14 = fc.integer({ min: 0, max: 16383 });
+
+const channelVoiceArbs: fc.Arbitrary<MidiMessage>[] = [
+    fc.record({
+        type: fc.constant("noteOff" as const),
+        channel,
+        note: data7,
+        velocity: data7,
+    }),
+    fc.record({
+        type: fc.constant("noteOn" as const),
+        channel,
+        note: data7,
+        velocity: data7,
+    }),
+    fc.record({
+        type: fc.constant("polyPressure" as const),
+        channel,
+        note: data7,
+        pressure: data7,
+    }),
+    fc.record({
+        type: fc.constant("controlChange" as const),
+        channel,
+        controller: data7,
+        value: data7,
+    }),
+    fc.record({
+        type: fc.constant("programChange" as const),
+        channel,
+        program: data7,
+    }),
+    fc.record({
+        type: fc.constant("channelPressure" as const),
+        channel,
+        pressure: data7,
+    }),
+    fc.record({
+        type: fc.constant("pitchBend" as const),
+        channel,
+        value: data14,
+    }),
+];
+
+const systemArbs: fc.Arbitrary<MidiMessage>[] = [
+    fc.record({
+        type: fc.constant("timeCode" as const),
+        channel: fc.constant(null),
+        value: data7,
+    }),
+    fc.record({
+        type: fc.constant("songPosition" as const),
+        channel: fc.constant(null),
+        position: data14,
+    }),
+    fc.record({
+        type: fc.constant("songSelect" as const),
+        channel: fc.constant(null),
+        song: data7,
+    }),
+    fc.record({
+        type: fc.constant("tuneRequest" as const),
+        channel: fc.constant(null),
+    }),
+    fc.record({
+        type: fc.constant("clock" as const),
+        channel: fc.constant(null),
+    }),
+    fc.record({
+        type: fc.constant("start" as const),
+        channel: fc.constant(null),
+    }),
+    fc.record({
+        type: fc.constant("continue" as const),
+        channel: fc.constant(null),
+    }),
+    fc.record({
+        type: fc.constant("stop" as const),
+        channel: fc.constant(null),
+    }),
+    fc.record({
+        type: fc.constant("activeSensing" as const),
+        channel: fc.constant(null),
+    }),
+    fc.record({
+        type: fc.constant("reset" as const),
+        channel: fc.constant(null),
+    }),
+];
+
+const sysexArb: fc.Arbitrary<MidiMessage> = fc
+    .uint8Array({ minLength: 0, maxLength: 32, min: 0, max: 0x7f })
+    .map((payload) => ({
+        type: "systemExclusive" as const,
+        channel: null,
+        payload,
+    }));
+
+const anyMessageArb = fc.oneof(...channelVoiceArbs, ...systemArbs, sysexArb);
+
+describe("property: encode/decode round-trip", () => {
+    it("every variant round-trips", { timeout: 30000 }, () => {
+        fc.assert(
+            fc.property(anyMessageArb, (msg) => {
+                const bytes = encodeMessage(msg);
+                const { msg: decoded, next } = decodeMessage(bytes, 0);
+                expect(next).toBe(bytes.length);
+                if (
+                    msg.type === "systemExclusive" &&
+                    decoded.type === "systemExclusive"
+                ) {
+                    expect(Array.from(decoded.payload)).toEqual(
+                        Array.from(msg.payload)
+                    );
+                } else {
+                    expect(decoded).toEqual(msg);
+                }
+            }),
+            { numRuns: 1000 }
+        );
+    });
+});