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

PR Close #30962

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

@@ -0,0 +1,37 @@
+/**
+ * @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, interval} from 'rxjs';
+
+import {asyncTest} from '../test-util';
+
+describe('Observable.interval', () => {
+  let log: any[];
+  let observable1: Observable<any>;
+
+  beforeEach(() => { log = []; });
+
+  it('interval func callback should run in the correct zone', asyncTest((done: any) => {
+       const constructorZone1: Zone = Zone.current.fork({name: 'Constructor Zone1'});
+       const subscriptionZone: Zone = Zone.current.fork({name: 'Subscription Zone'});
+       observable1 = constructorZone1.run(() => { return interval(10); });
+
+       subscriptionZone.run(() => {
+         const subscriber = observable1.subscribe(
+             (result: any) => {
+               log.push(result);
+               expect(Zone.current.name).toEqual(subscriptionZone.name);
+               if (result >= 3) {
+                 subscriber.unsubscribe();
+                 expect(log).toEqual([0, 1, 2, 3]);
+                 done();
+               }
+             },
+             () => { fail('should not call error'); }, () => {});
+       });
+     }, Zone.root));
+});