角度测试：窥探在控制器初始化时执行的函数 [英] Angular Testing: Spy a function that was executed on the initialize of a controller

问题描述

我一直试图窥探在控制器初始化时执行的函数，但测试总是失败。
我一直在尝试执行 $ scope。$ digest（）并且这不起作用，但在控制台中，我看到该函数已被调用。

I've been trying to spy a function that was executed on the initialize of a controller, but the test always failed. I've been trying execute $scope.$digest() and this it's not working, However in the console, i see that the function have been called.

我无法弄清楚这一点，有人可以向我解释为什么这不起作用？

I can't figure out this, Someone can explain to me why this it's not working?

Codepen示例：
http://codepen.io/gpincheiraa/pen/KzZNby

Codepen Example: http://codepen.io/gpincheiraa/pen/KzZNby

控制器

function Controller($stateParams, $scope){

  $scope.requestAuthorization = requestAuthorization;

  if ($stateParams.requestAuthorization === true) {
    console.log('$stateParams.requestAuthorization');
    $scope.requestAuthorization();
  }
  function requestAuthorization() {
    console.log('requestAuthorization()');
  }
}

测试

describe('AppCtrl', function(){
     var AppCtrl, $rootScope, $scope, $stateParams;

    beforeEach(module('exampleApp'));

    beforeEach(inject(function($controller, _$rootScope_, _$injector_, _$stateParams_) {
        $rootScope = _$rootScope_;
        $scope = $rootScope.$new();
        $stateParams = _$stateParams_;
        $stateParams.requestAuthorization = true;


        AppCtrl = $controller('AppCtrl',{
            $scope: $scope,
            $stateParams : $stateParams
        });

        spyOn($scope, 'requestAuthorization');          
    }));

     it('$stateParams.requestAuthorization should be defined', function() {             
        expect($stateParams.requestAuthorization).toBeDefined();
    });

    it('$scope.requestAuthorization should be defined', function() {
        expect($scope.requestAuthorization).toBeDefined();
    });

    // this test is not passing.. 
    it('should call requestAuthorization', function() {
                //$scope.$digest();
        expect($scope.requestAuthorization).toHaveBeenCalled();
    });

});

推荐答案

您的测试失败，因为间谍被实际功能覆盖当控制器初始化时。避免这种情况的一种方法是使用 requestAuthorization 属性的自定义setter进行猴子修补 $ scope 对象，这可能会创建间谍时控制器正在尝试为此属性赋值：

Your test is failing because spy gets overridden by real function when controller initializes. One way to avoid this is monkey-patching $scope object with custom setter for requestAuthorization property, that could create spy when controller is trying to assign value to this property:

    beforeEach(inject(function($controller, _$rootScope_, _$injector_, _$stateParams_) {
        $rootScope = _$rootScope_;
        $scope = $rootScope.$new();
        var reqAuthSpy;
        Object.defineProperty($scope, 'requestAuthorization', {
            get: function() {return reqAuthSpy;},
            set: function(fn) {
             reqAuthSpy = jasmine.createSpy('reqAuthSpy');
            }
        });
        $stateParams = _$stateParams_;
        $stateParams.requestAuthorization = true;


        AppCtrl = $controller('AppCtrl',{
            $scope: $scope,
            $stateParams : $stateParams
        });

    }));

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