fix(ngMock): $httpBackend should match data containing Date objects correctly

If a response or expectation contained a date object then `$httpBackend.expect`
was not matching correctly.

This commit encodes then decodes the object being matched to ensure consistency.

Closes #5127

Author: bcaudan

src/ngMock/angular-mocks.js

@@ -1563,7 +1563,9 @@ function MockHttpExpectation(method, url, data, headers) {
     if (angular.isUndefined(data)) return true;
     if (data && angular.isFunction(data.test)) return data.test(d);
     if (data && angular.isFunction(data)) return data(d);
-    if (data && !angular.isString(data)) return angular.equals(data, angular.fromJson(d));
+    if (data && !angular.isString(data)) {
+      return angular.equals(angular.fromJson(angular.toJson(data)), angular.fromJson(d));
+    }
     return data == d;
   };
 

test/ng/httpSpec.js

@@ -1053,6 +1053,12 @@ describe('$http', function() {
           });
 
 
+          it('should transform object with date into json', function() {
+            $httpBackend.expect('POST', '/url', {"date": new Date(Date.UTC(2013, 11, 25))}).respond('');
+            $http({method: 'POST', url: '/url', data: {date: new Date(Date.UTC(2013, 11, 25))}});
+          });
+
+
           it('should ignore strings', function() {
             $httpBackend.expect('POST', '/url', 'string-data').respond('');
             $http({method: 'POST', url: '/url', data: 'string-data'});