From bca88b67e33e657380435d440ce847e4573db8b2 Mon Sep 17 00:00:00 2001
From: Jarred Sumner <jarred@jarredsumner.com>
Date: Sun, 17 Sep 2023 17:38:03 -0700
Subject: Workaround #5604 (#5615)

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
---
 test/js/web/timers/performance.test.js | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'test/js')

diff --git a/test/js/web/timers/performance.test.js b/test/js/web/timers/performance.test.js
index dd50c4dc6..0d6cd577b 100644
--- a/test/js/web/timers/performance.test.js
+++ b/test/js/web/timers/performance.test.js
@@ -20,3 +20,28 @@ it("performance.now() should be monotonic", () => {
 it("performance.timeOrigin + performance.now() should be similar to Date.now()", () => {
   expect(Math.abs(performance.timeOrigin + performance.now() - Date.now()) < 1000).toBe(true);
 });
+
+// https://github.com/oven-sh/bun/issues/5604
+it("performance.now() DOMJIT", () => {
+  // This test is very finnicky.
+  // It has to return true || return false to reproduce. Throwing an error doesn't work.
+  function run(start, prev) {
+    while (true) {
+      const current = performance.now();
+
+      if (Number.isNaN(current) || current < prev) {
+        return false;
+      }
+
+      if (current - start > 200) {
+        return true;
+      }
+      prev = current;
+    }
+  }
+
+  const start = performance.now();
+  if (!run(start, start)) {
+    throw new Error("performance.now() is not monotonic");
+  }
+});
-- 
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