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

PR Close #30962

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

@@ -0,0 +1,44 @@
+/**
+ * @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, defer} from 'rxjs';
+
+describe('Observable.defer', () => {
+  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('defer func callback should run in the correct zone', () => {
+    observable1 = constructorZone1.run(() => {
+      return defer(() => {
+        return new Observable<number>(subscribe => {
+          log.push('setup');
+          expect(Zone.current.name).toEqual(constructorZone1.name);
+          subscribe.next(1);
+          subscribe.complete();
+          return () => {
+            expect(Zone.current.name).toEqual(constructorZone1.name);
+            log.push('cleanup');
+          };
+        });
+      });
+    });
+
+    subscriptionZone.run(() => {
+      observable1.subscribe((result: any) => {
+        expect(Zone.current.name).toEqual(subscriptionZone.name);
+        log.push(result);
+      });
+    });
+
+    expect(log).toEqual(['setup', 1, 'cleanup']);
+  });
+});