Question

在角度js单元测试中，我想设置每个测试的xhr响应（在“it”方法中），而不是在beforeEach方法中，但它似乎不起作用。？

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

  beforeEach(inject(function(_$httpBackend_, $rootScope, $controller) {
    $httpBackend = _$httpBackend_;
    $controller(ExampleListCtrl, {$scope: $scope = $rootScope.$new()});
  }));

  it('should create "examples"  with 0 example fetched', 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', function(){
  var $scope, $rootScope, $httpBackend;

  beforeEach(inject(function(_$httpBackend_, $rootScope, $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([]);
  });

});

Answer 1

这是因为一旦您实例化控制器，它就会获取$http，因此会$httBackend。因此，所有期望都应在要求之前作出。

如果您希望将$httpBackend.expectGet移至规范（it区块），则需要按照预期移动$controller(ExempleListCtrl, ...。

angular.js如何在每次测试中模拟（或存根）xhr请求

1 个答案: