test($resource): Delete $cancelRequest from toJSON()

Add test of pull request angular#15244 (angular#15244)

Author: supasak

test/ngResource/resourceSpec.js

@@ -737,7 +737,7 @@ describe('basic usage', function() {
     expect(person2).toEqual(jasmine.any(Person));
   });
 
-  it('should not include $promise and $resolved when resource is toJson\'ed', function() {
+  it('should not include $promise, $resolved and $cancelRequest when resource is toJson\'ed', function() {
     $httpBackend.expect('GET', '/CreditCard/123').respond({id: 123, number: '9876'});
     var cc = CreditCard.get({id: 123});
     $httpBackend.flush();
@@ -750,6 +750,7 @@ describe('basic usage', function() {
     var json = JSON.parse(angular.toJson(cc));
     expect(json.$promise).not.toBeDefined();
     expect(json.$resolved).not.toBeDefined();
+    expect(json.$cancelRequest).not.toBeDefined();
     expect(json).toEqual({id: 123, number: '9876', $myProp: 'still here'});
   });