test(matchers): add support for toHaveClass in tests

modules/angular2/test/test_lib/test_lib_spec.ts

@@ -11,6 +11,7 @@ import {
   containsRegexp
 } from 'angular2/test_lib';
 
+import {DOM} from 'angular2/src/dom/dom_adapter';
 import {MapWrapper} from 'angular2/src/facade/collection';
 import {IMPLEMENTS, RegExpWrapper} from 'angular2/src/facade/lang';
 
@@ -42,6 +43,20 @@ export function main() {
       });
     });
 
+    describe("toHaveCssClass", () => {
+      it("should assert that the CSS class is present", () => {
+        var el = DOM.createElement('div');
+        DOM.addClass(el, 'matias');
+        expect(el).toHaveCssClass('matias');
+      });
+
+      it("should assert that the CSS class is not present", () => {
+        var el = DOM.createElement('div');
+        DOM.addClass(el, 'matias');
+        expect(el).not.toHaveCssClass('fatias');
+      });
+    });
+
     describe('toEqual for Maps', () => {
       it('should detect equality for same reference', () => {
         var m1 = MapWrapper.createFromStringMap({'a': 1});