Adding Angular and dependent packages for testing

third_party/pkg/angular/test/introspection_spec.dart

+library introspection_spec;
+
+import '_specs.dart';
+
+main() => describe('introspection', () {
+  it('should retrieve ElementProbe', inject((TestBed _) {
+    _.compile('<div ng-bind="true"></div>');
+    ElementProbe probe = ngProbe(_.rootElement);
+    expect(probe.injector.parent).toBe(_.injector);
+    expect(ngInjector(_.rootElement).parent).toBe(_.injector);
+    expect(probe.directives[0] is NgBindDirective).toBe(true);
+    expect(ngDirectives(_.rootElement)[0] is NgBindDirective).toBe(true);
+    expect(probe.scope).toBe(_.rootScope);
+    expect(ngScope(_.rootElement)).toBe(_.rootScope);
+  }));
+
+  toHtml(List list) => list.map((e) => e.outerHtml).join('');
+
+  it('should select elements using CSS selector', () {
+    var div = new Element.html('<div><p><span></span></p></div>');
+    var span = div.querySelector('span');
+    var shadowRoot = span.createShadowRoot();
+    shadowRoot.innerHtml = '<ul><li>stash</li><li>secret</li><ul>';
+
+    expect(toHtml(ngQuery(div, 'li'))).toEqual('<li>stash</li><li>secret</li>');
+    expect(toHtml(ngQuery(div, 'li', 'stash'))).toEqual('<li>stash</li>');
+    expect(toHtml(ngQuery(div, 'li', 'secret'))).toEqual('<li>secret</li>');
+    expect(toHtml(ngQuery(div, 'li', 'xxx'))).toEqual('');
+  });
+});