Adding Angular and dependent packages for testing

third_party/pkg/angular/test/directive/ng_bind_template_spec.dart

+library ng_bind_template_spec;
+
+import '../_specs.dart';
+
+main() {
+  describe('BindTemplateDirective', () {
+    TestBed _;
+
+    beforeEach(inject((TestBed tb) => _ = tb));
+
+    it('should bind template',
+          inject((Scope scope, Injector injector, Compiler compiler) {
+      var element = _.compile('<div ng-bind-template="{{salutation}} {{name}}!"></div>');
+      scope.salutation = 'Hello';
+      scope.name = 'Heisenberg';
+      scope.$digest();
+
+      expect(element.text).toEqual('Hello Heisenberg!');
+
+      scope.salutation = 'Good-Bye';
+      scope.$digest();
+
+      expect(element.text).toEqual('Good-Bye Heisenberg!');
+    }));
+  });
+}