refactor: move angular source to /packages rather than modules/@angular

packages/core/test/util/lang_spec.ts

@@ -0,0 +1,47 @@
+/**
+ * @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 {isObservable, isPromise} from '@angular/core/src/util/lang';
+import {of } from 'rxjs/observable/of';
+
+export function main() {
+  describe('isPromise', () => {
+    it('should be true for native Promises',
+       () => expect(isPromise(Promise.resolve(true))).toEqual(true));
+
+    it('should be true for thenables', () => expect(isPromise({then: () => {}})).toEqual(true));
+
+    it('should be false if "then" is not a function',
+       () => expect(isPromise({then: 0})).toEqual(false));
+
+    it('should be false if the argument has no "then" function',
+       () => expect(isPromise({})).toEqual(false));
+
+    it('should be false if the argument is undefined or null', () => {
+      expect(isPromise(undefined)).toEqual(false);
+      expect(isPromise(null)).toEqual(false);
+    });
+  });
+
+  describe('isObservable', () => {
+    it('should be true for an Observable', () => expect(isObservable(of (true))).toEqual(true));
+
+    it('should be false if the argument is undefined',
+       () => expect(isObservable(undefined)).toEqual(false));
+
+    it('should be false if the argument is null', () => expect(isObservable(null)).toEqual(false));
+
+    it('should be false if the argument is an object',
+       () => expect(isObservable({})).toEqual(false));
+
+    it('should be false if the argument is a function',
+       () => expect(isObservable(() => {})).toEqual(false));
+
+    it('should be false if the argument is the object with subscribe function',
+       () => expect(isObservable({subscribe: () => {}})).toEqual(false));
+  });
+}