1 files changed, 34 insertions, 0 deletions
diff --git a/cli/tests/unit/timers_test.ts b/cli/tests/unit/timers_test.ts
index 7adff0095..8a22173de 100644
--- a/cli/tests/unit/timers_test.ts
+++ b/cli/tests/unit/timers_test.ts
@@ -366,3 +366,37 @@ unitTest(async function timerNestedMicrotaskOrdering(): Promise<void> {
 unitTest(function testQueueMicrotask() {
   assertEquals(typeof queueMicrotask, "function");
 });
+
+unitTest(async function timerIgnoresDateOverride(): Promise<void> {
+  const OriginalDate = Date;
+  const { promise, resolve, reject } = deferred();
+  let hasThrown = 0;
+  try {
+    const overrideCalled: () => number = () => {
+      reject("global Date override used over original Date object");
+      return 0;
+    };
+    function DateOverride(): void {
+      overrideCalled();
+    }
+    globalThis.Date = DateOverride as DateConstructor;
+    globalThis.Date.now = overrideCalled;
+    globalThis.Date.UTC = overrideCalled;
+    globalThis.Date.parse = overrideCalled;
+    queueMicrotask(resolve);
+    await promise;
+    hasThrown = 1;
+  } catch (err) {
+    if (typeof err === "string") {
+      assertEquals(err, "global Date override used over original Date object");
+      hasThrown = 2;
+    } else if (err instanceof TypeError) {
+      hasThrown = 3;
+    } else {
+      hasThrown = 4;
+    }
+  } finally {
+    globalThis.Date = OriginalDate;
+  }
+  assertEquals(hasThrown, 1);
+});