1 files changed, 104 insertions, 0 deletions
diff --git a/cli/js/globals_test.ts b/cli/js/globals_test.ts
new file mode 100644
index 000000000..d7c50c5b1
--- /dev/null
+++ b/cli/js/globals_test.ts
@@ -0,0 +1,104 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { test, assert } from "./test_util.ts";
+
+test(function globalThisExists(): void {
+  assert(globalThis != null);
+});
+
+test(function windowExists(): void {
+  assert(window != null);
+});
+
+test(function windowWindowExists(): void {
+  assert(window.window === window);
+});
+
+test(function globalThisEqualsWindow(): void {
+  assert(globalThis === window);
+});
+
+test(function DenoNamespaceExists(): void {
+  assert(Deno != null);
+});
+
+test(function DenoNamespaceEqualsWindowDeno(): void {
+  assert(Deno === window.Deno);
+});
+
+test(function DenoNamespaceIsFrozen(): void {
+  assert(Object.isFrozen(Deno));
+});
+
+test(function webAssemblyExists(): void {
+  assert(typeof WebAssembly.compile === "function");
+});
+
+test(function DenoNamespaceImmutable(): void {
+  const denoCopy = window.Deno;
+  try {
+    // @ts-ignore
+    Deno = 1;
+  } catch {}
+  assert(denoCopy === Deno);
+  try {
+    // @ts-ignore
+    window.Deno = 1;
+  } catch {}
+  assert(denoCopy === Deno);
+  try {
+    delete window.Deno;
+  } catch {}
+  assert(denoCopy === Deno);
+
+  const { readFile } = Deno;
+  try {
+    // @ts-ignore
+    Deno.readFile = 1;
+  } catch {}
+  assert(readFile === Deno.readFile);
+  try {
+    delete window.Deno.readFile;
+  } catch {}
+  assert(readFile === Deno.readFile);
+
+  // @ts-ignore
+  const { print } = Deno.core;
+  try {
+    // @ts-ignore
+    Deno.core.print = 1;
+  } catch {}
+  // @ts-ignore
+  assert(print === Deno.core.print);
+  try {
+    // @ts-ignore
+    delete Deno.core.print;
+  } catch {}
+  // @ts-ignore
+  assert(print === Deno.core.print);
+});
+
+test(async function windowQueueMicrotask(): Promise<void> {
+  let resolve1: () => void | undefined;
+  let resolve2: () => void | undefined;
+  let microtaskDone = false;
+  const p1 = new Promise(
+    (res): void => {
+      resolve1 = (): void => {
+        microtaskDone = true;
+        res();
+      };
+    }
+  );
+  const p2 = new Promise(
+    (res): void => {
+      resolve2 = (): void => {
+        assert(microtaskDone);
+        res();
+      };
+    }
+  );
+  window.queueMicrotask(resolve1!);
+  setTimeout(resolve2!, 0);
+  await p1;
+  await p2;
+});