测试 Angular $emit 和 $on 事件

Question

我正在尝试为控制器中的事件编写单元测试。

下面是我的控制器

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);
    }

}]);

下面是我正在尝试编写的测试

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
    });
});

我期待更新父控制器中的消息，但是测试失败了 expect(scope.message).toBe('Ralf ninja turtle');

Answer 1

您需要在调用 $emit 之后调用 $scope.$apply()。这会在应用程序中自动发生，但需要在测试中明确调用。

Answer 2

在测试用例中 scope.$on 被监视了。

spyOn(scope, '$on');

为了调用实际的功能，必须加上.and.callThrough()。

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

这是一个完整的工作示例：

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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测试 Angular $emit 和 $on 事件

Testing Angular $emit and $on events

javascript

jasmine

angularjs