測試Angular $ emit和$ on事件

Question

我正在嘗試為控制器中的事件編寫單元測試。

以下是我的控制器

myApp.controller('ParentCtrl', ['$scope', function ($scope) {
    $scope.message = "Some text in parent";
    $scope.$on("update_parent_controller", function(event, message){
        $scope.message = message;
    });

}])
.controller('ChildCtrl', ['$scope', function ($scope) {
    $scope.clickFunction = function() {
    $scope.message = "Parent updated from child controller";

        $scope.$emit('update_parent_controller', $scope.message);
    }

}]);

以下是我試圖寫的測試

describe("Hello Controller Test", function () {
    var ctrl, scope;

    beforeEach(module("myApp"));

    beforeEach(inject(function ($controller, $rootScope) {
        scope = $rootScope.$new();
        spyOn(scope, '$on');

        ctrl = $controller("ParentCtrl", {
            $scope : scope
        });
    }));

    it('should change ParentCtrl message property from child ctrl', function (){

        var new_hero = 'Ralf ninja turtle',
            sub_scope = scope.$new();

        sub_scope.$emit('update_parent_controller', new_hero);

        expect(scope.$on).toHaveBeenCalled();
        expect(scope.message).toBe('Ralf ninja turtle'); //Getting err here
    });
});

我希望更新父控制器中的消息，但是測試在期望失敗（scope.message）.toBe（'Ralf ninja turtle'）;

Answer 1

調用$emit后需要調用$scope.$apply() 。 這將在應用程序中自動發生，但需要在測試中明確調用。

Answer 2

在測試用例scope.$on被監視。

spyOn(scope, '$on');

為了調用實際函數，必須添加.and.callThrough() 。

spyOn(scope, '$on').and.callThrough();

這是一個完整的工作示例：

 angular.module('myApp', []).controller('ParentCtrl', ['$scope', function ($scope) { $scope.message = "Some text in parent"; $scope.$on("update_parent_controller", function(event, message){ $scope.message = message; }); }]); describe("Hello Controller Test", function () { var ctrl, scope; beforeEach(module("myApp")); beforeEach(inject(function ($controller, $rootScope) { scope = $rootScope.$new(); spyOn(scope, '$on').and.callThrough(); // <-- This is the fix ctrl = $controller("ParentCtrl", { $scope : scope }); })); it('should change ParentCtrl message property from child ctrl', function (){ var new_hero = 'Ralf ninja turtle', sub_scope = scope.$new(); sub_scope.$emit('update_parent_controller', new_hero); expect(scope.$on).toHaveBeenCalled(); expect(scope.message).toBe('Ralf ninja turtle'); //Getting err here }); }); 

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