chore(browsers): fix failing tests in Firefox

Closes #3386

modules/angular2/test/core/compiler/integration_spec.ts

@@ -900,14 +900,14 @@ export function main() {
 
                  .createAsync(MyComp)
                  .then((rootTC) => {
-                   expect(DOM.getChecked(rootTC.componentViewChildren[0].nativeElement))
-                       .toBeFalsy();
-                   expect(DOM.getChecked(rootTC.componentViewChildren[1].nativeElement))
-                       .toBeFalsy();
+                   var dispatchedEvent = DOM.createMouseEvent('click');
+                   var dispatchedEvent2 = DOM.createMouseEvent('click');
                    DOM.dispatchEvent(rootTC.componentViewChildren[0].nativeElement,
-                                     DOM.createMouseEvent('click'));
+                                     dispatchedEvent);
                    DOM.dispatchEvent(rootTC.componentViewChildren[1].nativeElement,
-                                     DOM.createMouseEvent('click'));
+                                     dispatchedEvent2);
+                   expect(DOM.isPrevented(dispatchedEvent)).toBe(true);
+                   expect(DOM.isPrevented(dispatchedEvent2)).toBe(false);
                    expect(DOM.getChecked(rootTC.componentViewChildren[0].nativeElement))
                        .toBeFalsy();
                    expect(DOM.getChecked(rootTC.componentViewChildren[1].nativeElement))

modules/angular2/test/dom/dom_adapter_spec.ts

@@ -34,7 +34,7 @@ export function main() {
 
       expect(clone).not.toBe(el1);
       DOM.setAttribute(clone, 'test', '1');
-      expect(DOM.getOuterHTML(clone)).toEqual('<div x="y" test="1">a<span>b</span></div>');
+      expect(stringifyElement(clone)).toEqual('<div test="1" x="y">a<span>b</span></div>');
       expect(DOM.getAttribute(el1, 'test')).toBeFalsy();
 
       var cNodes = DOM.childNodes(clone);

modules/angular2/test/render/dom/view/proto_view_merger_integration_spec.ts

@@ -267,8 +267,8 @@ export function main() {
                  tb.merge([rootProtoViewDto, componentProtoViewDto])
                      .then(mergeMappings => {
                        var domPv = resolveInternalDomProtoView(mergeMappings.mergedProtoViewRef);
-                       expect(DOM.getInnerHTML(templateRoot(domPv)))
-                           .toEqual('<root class="ng-binding" a="b"></root>');
+                       expect(stringifyElement(templateRoot(domPv)))
+                           .toEqual('<template><root a="b" class="ng-binding"></root></template>');
                        async.done();
                      });
                });

modules/angular2/test/router/outlet_spec.ts

@@ -541,8 +541,7 @@ export function main() {
                  rootTC.detectChanges();
 
                  var dispatchedEvent = clickOnElement(rootTC);
-                 expect(dispatchedEvent.defaultPrevented || !dispatchedEvent.returnValue)
-                     .toBe(true);
+                 expect(DOM.isPrevented(dispatchedEvent)).toBe(true);
 
                  // router navigation is async.
                  rtr.subscribe((_) => {
@@ -563,8 +562,7 @@ export function main() {
                  rootTC.detectChanges();
 
                  var dispatchedEvent = clickOnElement(rootTC);
-                 expect(dispatchedEvent.defaultPrevented || !dispatchedEvent.returnValue)
-                     .toBe(true);
+                 expect(DOM.isPrevented(dispatchedEvent)).toBe(true);
 
                  // router navigation is async.
                  rtr.subscribe((_) => {