angularjs – angular.js如何在每次测试中模拟(或存根)xhr请求

这有效

describe('ExampleListCtrl',function(){
  var $scope,$httpBackend;

  beforeEach(inject(function(_$httpBackend_,$rootScope,$controller) {
    $httpBackend = _$httpBackend_;
    $httpBackend.expectGET('examples').respond([]);   // <--- THIS ONE
    $controller(ExampleListCtrl,{$scope: $scope = $rootScope.$new()});
  }));

  it('should create "examples"  with 0 example fetched',function() {
    expect($scope.examples).toBeUndefined();
    $httpBackend.flush();
    expect($scope.examples).toEqual([]);
  });

});

结果

Executed 8 of 8 SUCCESS (0.366 secs / 0.043 secs)

但是当我将expectGet方法移动到每个方法时,这会失败并出现错误.我不知道为什么.

describe('ExampleListCtrl',$controller) {
    $httpBackend = _$httpBackend_;
    $controller(ExampleListCtrl,function() {
    $httpBackend.expectGET('examples').respond([]);  // <--- MOVED TO HERE
    expect($scope.examples).toBeUndefined();
    $httpBackend.flush();
    expect($scope.examples).toEqual([]);
  });
});

这是错误

....
at /Users/me/app/test/unit/controllers/ExampleListCtrlSpec.js:3:1
      Error: No pending request to flush
at Error (<anonymous>)
at Function.$httpBackend.flush (/Users/me/app/test/lib/angular/angular-mocks.js:1171:34)
at null.<anonymous> (/Users/me/app/test/unit/controllers/ExampleListCtrlSpec.js:14:18)

—-编辑—-

按照下面的建议,我已将控制器移出beforeEach,并更改了这样的测试,以便我可以多次测试$httpBackend.expectGET.

describe('ExampleListCtrl',$controller) {
    $httpBackend = _$httpBackend_;
    controller = $controller;
    $scope = $rootScope.$new();
  }));

  it('should create "examples" model with 0 example fetched from xhr',function() {
    $httpBackend.expectGET('examples').respond([]);
    controller(ExampleListCtrl,{$scope: $scope});
    $httpBackend.flush();
    expect($scope.examples).toEqual([]);
  });

});