如何使用Jasmine对链式方法进行单元测试

I'm having a problem unit testing the following method:

我有一个问题单元测试以下方法：

 $scope.changeLocation = function (url) {
        $location.path(url).search({ ref: "outline" });
    };

I've written the following unit test that currently fails with this error (TypeError: Cannot read property 'search' of undefined):

我编写了以下单元测试，该测试当前因此错误而失败（TypeError：无法读取未定义的属性'search'）：

var $locationMock = { path: function () { }, search: function () { } };

it('changeLocation should update location correctly', function () {
        $controllerConstructor('CourseOutlineCtrl', { $scope: $scope, $location: $locationMock });

        var url = "/url/";
        spyOn($locationMock, "path");
        spyOn($locationMock, "search");

        $scope.changeLocation(url);

        expect($locationMock.search).toHaveBeenCalledWith({ ref: "outline" });
        expect($locationMock.path).toHaveBeenCalledWith(url);
    });

If I change my function to the following, the test passes:

如果我将我的功能更改为以下内容，则测试通过：

$scope.changeLocation = function (url) {
        $location.path(url);
        $location.search({ ref: "outline" });
    };

How do I unit test this method when I'm using method chaining? Do I need to setup my $locationMock differently? For the life of me I cannot figure this out.

当我使用方法链时，如何对此方法进行单元测试？我需要以不同方式设置$ locationMock吗？对于我的生活，我无法弄清楚这一点。

2 个解决方案

#1

That is because your mock does not return location object to be able to chain through. Using Jasmine 2.0 you can change your mock to:

那是因为你的mock不会返回位置对象以便能够链接。使用Jasmine 2.0，您可以将模拟更改为：

var $locationMock = { path: function () { return $locationMock; }, 
                      search: function () { return $locationMock; } };

and

和

spyOn($locationMock, "path").and.callThrough();
spyOn($locationMock, "search").and.callThrough(); //if you are chaining from search

or add:

或添加：

spyOn($locationMock, "path").and.returnValue($locationMock);
spyOn($locationMock, "search").and.returnValue($locationMock); //if you are chaining from search

Or just create a spy object (less code):

或者只是创建一个间谍对象（更少的代码）：

var $locationMock = jasmine.createSpyObj('locationMock', ['path', 'search']);

and

和

$locationMock.path.and.returnValue($locationMock);
$locationMock.search.and.returnValue($locationMock); //if you are chaining from search

#2

try :

尝试：

spyOn($locationMock, "path").and.callThrough();

Else you'r calling search on a mock not $location

否则你会在模拟非$位置上调用搜索

#1