1 files changed, 22 insertions, 0 deletions
diff --git a/test/js/web/timers/performance.test.js b/test/js/web/timers/performance.test.js
new file mode 100644
index 000000000..dd50c4dc6
--- /dev/null
+++ b/test/js/web/timers/performance.test.js
@@ -0,0 +1,22 @@
+import { expect, it } from "bun:test";
+
+it("performance.now() should be monotonic", () => {
+  const first = performance.now();
+  const second = performance.now();
+  const third = performance.now();
+  const fourth = performance.now();
+  const fifth = performance.now();
+  const sixth = performance.now();
+  expect(first < second).toBe(true);
+  expect(second < third).toBe(true);
+  expect(third < fourth).toBe(true);
+  expect(fourth < fifth).toBe(true);
+  expect(fifth < sixth).toBe(true);
+  expect(Bun.nanoseconds() > 0).toBe(true);
+  expect(Bun.nanoseconds() > sixth).toBe(true);
+  expect(typeof Bun.nanoseconds() === "number").toBe(true);
+});
+
+it("performance.timeOrigin + performance.now() should be similar to Date.now()", () => {
+  expect(Math.abs(performance.timeOrigin + performance.now() - Date.now()) < 1000).toBe(true);
+});