From d52e4007c887caaa073e43088fd92c3589a41dd5 Mon Sep 17 00:00:00 2001
From: Kyle June <kylejune1415@gmail.com>
Date: Sat, 4 Jul 2020 15:16:27 -0400
Subject: Update timers to ignore Date Override (#6552)

---
 cli/tests/unit/timers_test.ts | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

(limited to 'cli/tests')

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);
+});
-- 
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