diff --git a/js/publish/src/audio/encoder.test.ts b/js/publish/src/audio/encoder.test.ts
index bf4a47b968..1abb22aa67 100644
--- a/js/publish/src/audio/encoder.test.ts
+++ b/js/publish/src/audio/encoder.test.ts
@@ -305,24 +305,33 @@ test("a push completing several frames keeps the encoder running", async () => {
 // it, which the catalog advertises as `delay`.
 test("a rendition trailing the broadcast's earliest advertises delay", async () => {
 	using _webcodecs = installFakeWebCodecs();
-	const baseline = new Baseline();
-	using env = await setup(baseline);
-	const { encoder, feed } = env;
+	const clock = spyOn(performance, "now").mockReturnValue(200);
 
-	expect(encoder.out.catalog.peek()?.delay).toBeUndefined();
+	try {
+		const baseline = new Baseline();
+		using env = await setup(baseline);
+		const { encoder, feed } = env;
 
-	// A sibling that flushes each frame the instant it is captured.
-	baseline.observe(0, performance.now() * 1000);
+		expect(encoder.out.catalog.peek()?.delay).toBeUndefined();
 
-	// Captured 100ms ago, so this rendition flushes at least that late.
-	const start = performance.now() * 1000 - 100_000;
-	for (let index = 0; index < 4; index++) {
-		await feed.push({ timestamp: Time.Micro(start + index * 20_000), channels: [new Float32Array(960)] });
-	}
-	await feed.drain();
+		// A sibling that flushes each frame the instant it is captured.
+		baseline.observe(0, performance.now() * 1000);
+
+		// Captured 100ms ago, with a clock origin that keeps timestamps nonnegative.
+		const start = performance.now() * 1000 - 100_000;
+		for (let index = 0; index < 4; index++) {
+			await feed.push({ timestamp: Time.Micro(start + index * 20_000), channels: [new Float32Array(960)] });
+		}
+		await feed.drain();
 
-	expect(env.written.length).toBe(2);
-	expect(encoder.out.catalog.peek()?.delay).toBeGreaterThanOrEqual(100);
+		expect(env.written).toEqual([
+			[100_000, 1],
+			[120_000, 1],
+		]);
+		expect(encoder.out.catalog.peek()).toMatchObject({ delay: 100 });
+	} finally {
+		clock.mockRestore();
+	}
 });
 
 // Regression: codec settings that can't resolve left the encoder unsettled, so `<moq-publish>` never
diff --git a/quest/m1/test-flakes-2/README.md b/quest/m1/test-flakes-2/README.md
index 0472cfb295..2d41c024a0 100644
--- a/quest/m1/test-flakes-2/README.md
+++ b/quest/m1/test-flakes-2/README.md
@@ -33,7 +33,6 @@ Public API: none. Wire: none.
 - [moq-cli tests on a paused clock](/quest/m1/test-flakes-2/cli-paused-clock.md) - the fetch timeout and completion tests stop racing wall-clock budgets
 - [Subscription cut by disconnect](/quest/m1/test-flakes-2/subscription-cut.md) - a publisher disconnect never ends a subscription clean
 - [Media late join](/quest/m1/test-flakes-2/media-late-join.md) - `just test media` late join stays within one GOP, or the regression is fixed
-- [js/publish audio clock](/quest/m1/test-flakes-2/publish-audio-clock.md) - the audio encoder delay test runs on mock time
 - [moq-mux live import clock](/quest/m1/test-flakes-2/mux-live-import-clock.md) - the live import restart tests advance a paused clock instead of sleeping
 
 ## Related
diff --git a/quest/m1/test-flakes-2/publish-audio-clock.md b/quest/m1/test-flakes-2/publish-audio-clock.md
deleted file mode 100644
index ccc4becaad..0000000000
--- a/quest/m1/test-flakes-2/publish-audio-clock.md
+++ /dev/null
@@ -1,11 +0,0 @@
-# [XS] js/publish audio delay test on mock time
-
-## Goal
-
-The js/publish audio encoder test "a rendition trailing the broadcast's
-earliest advertises delay" passes when its file runs alone.
-
-## Plan
-
-It reads the real clock, so timestamps go negative early in the process and
-it fails when run alone (#4414). Run it on mock time.