import { describe, test } from "bun:test"; import assert from "node:assert/strict"; import { buildVoiceLatencyStageMetrics, computeLatencyMs } from "./voiceLatencyTracker.ts";

describe("computeLatencyMs", () => { test("returns rounded elapsed milliseconds for valid timestamps", () => { assert.equal(computeLatencyMs(100.25, 160.75), 61); });

test("returns null for non-finite, non-positive, or reversed timestamps", () => { assert.equal(computeLatencyMs(0, 100), null); assert.equal(computeLatencyMs(100, 99), null); assert.equal(computeLatencyMs(Number.NaN, 100), null); assert.equal(computeLatencyMs(100, Number.POSITIVE_INFINITY), null); }); });

describe("buildVoiceLatencyStageMetrics", () => { test("computes each stage from adjacent timestamps", () => { const metrics = buildVoiceLatencyStageMetrics({ finalizedAtMs: 100, asrStartedAtMs: 140, asrCompletedAtMs: 220, generationStartedAtMs: 350, replyRequestedAtMs: 400, audioStartedAtMs: 455 });

assert.deepEqual(metrics, {
  finalizedToAsrStartMs: 40,
  asrToGenerationStartMs: 130,
  generationToReplyRequestMs: 50,
  replyRequestToAudioStartMs: 55
});

});

test("computes each stage independently when some timestamps are missing or invalid", () => { const metrics = buildVoiceLatencyStageMetrics({ finalizedAtMs: 100, asrStartedAtMs: 150, asrCompletedAtMs: 0, generationStartedAtMs: 260, replyRequestedAtMs: 310, audioStartedAtMs: 305 });

assert.deepEqual(metrics, {
  finalizedToAsrStartMs: 50,
  asrToGenerationStartMs: null,
  generationToReplyRequestMs: 50,
  replyRequestToAudioStartMs: null
});

}); });