build: move zone.js to angular repo (#30962)

PR Close #30962

packages/zone.js/test/rxjs/rxjs.empty.spec.ts

@@ -0,0 +1,28 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import {Observable, empty} from 'rxjs';
+
+describe('Observable.empty', () => {
+  let log: any[];
+  const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
+  const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
+  let observable1: Observable<any>;
+
+  beforeEach(() => { log = []; });
+
+  it('empty func callback should run in the correct zone', () => {
+    observable1 = constructorZone1.run(() => { return empty(); });
+
+    subscriptionZone.run(() => {
+      observable1.subscribe(
+          (result: any) => { fail('should not call next'); },
+          () => { fail('should not call error'); },
+          () => { expect(Zone.current.name).toEqual(subscriptionZone.name); });
+    });
+  });
+});