AngularJs Jasmine 单元测试中的 $httpBackend

2022-01-11 00:00:00 unit-testing angularjs jasmine javascript

我无法让我的单元测试正常工作.我有一个 $scope 数组，它一开始是空的，但应该用 $http.get() 填充.在真实环境中，数组中大约有 15 个左右的对象，但对于我的单元测试，我只抓了 2 个.对于单元测试，我有:

I'm unable to get my unit test to work properly. I have a $scope array that starts out empty, but should be filled with an $http.get(). In the real environment, there'd be approx 15 or so objects in the array, but for my unit test I just grabbed 2. For the unit test, I have:

expect($scope.stuff.length).toBe(2);

但是 jasmine 的错误是:Expected 0 to be 2.

But jasmine's error is: Expected 0 to be 2.

这是我的 controller.js:

here's my controller.js:

$scope.stuff = [];
$scope.getStuff = function () {
    var url = site.root + 'api/stuff';
    $http.get(url)
        .success(function (data) {
            $scope.stuff = data;
        })
        .error(function(error) {
            console.log(error);
        });
};

而我的 controller.spec.js 是:

and my controller.spec.js is:

/// <reference path="../../../scripts/angular-loader.min.js" />
/// <reference path="../../../scripts/angular.min.js" />
/// <reference path="../../../scripts/angular-mocks.js" />
/// <reference path="../../../scripts/angular-resource.js" />
/// <reference path="../../../scripts/controller.js" />
beforeEach(module('ui.router'));
beforeEach(module('ngResource'));
beforeEach(module('ngMockE2E'));
beforeEach(module('myApplication'));
var $scope;
var controller;
var httpLocalBackend;

beforeEach(inject(function ($rootScope, $controller, $injector) {
    $scope = $rootScope.$new();
    controller = $controller("StuffController", {
        $scope: $scope
    });
}));

beforeEach(inject(function ($httpBackend) {
    httpLocalBackend = $httpBackend;
}));

it('should get stuff', function () {
    var url = '/api/stuff';
    var httpResponse = [{ "stuffId": 1 }, { "stuffId": 2 }];
    httpLocalBackend.expectGET(url).respond(200, httpResponse);
    $scope.getStuff();
    expect($scope.stuff.length).toBe(2);
    //httpLocalBackend.flush();
} );

现在，很明显，我更改了变量名称等，因为这是为了工作，但希望这对任何人都有足够的信息来帮助我.如果需要，我可以提供更多.取消注释 .flush() 行时，我还会遇到第二个错误，但稍后我会谈到.

Now, obviously, I changed variable names and such since this is for work, but hopefully this is enough information for anybody to help me. I can provide more if needed. I also get a second error when uncommenting the .flush() line, but I'll get to that a bit later.

非常感谢任何帮助，并在此先感谢！

Any help is greatly appreciated and thanks in advance!

终于搞定了！这是我的最终代码:

Finally got it working! Here's my final code:

it('should get stuff', function () {
    var url = '/api/stuff';
    var httpResponse = [{ "stuffId": 1 }, { "stuffId": 2 }];
    httpLocalBackend.expectGET(url).respond(200, httpResponse);
    $scope.getStuff();
    httpLocalBackend.flush();
    expect($scope.stuff.length).toBe(2);
} );

编辑 2:我遇到了另一个问题，我认为这可能是其根本原因.请参阅在启动时调用函数时单元测试失败

EDIT 2: I ran into another problem, which I think may have been the root cause of this. See Unit test failing when function called on startup

推荐答案

需要在expect($scope.stuff.length).toBe(2)之前放置httpLocalBackend.flush()语句.发出请求后，您需要刷新它以使数据在您的客户端代码中可用.

You need to place httpLocalBackend.flush() statement before expect($scope.stuff.length).toBe(2). Once you make a request you need to flush it for the data to be available in your client code.

it('should get stuff', function () {
    var url = '/api/roles';
    var httpResponse = [{ "stuffId": 1 }, { "stuffId": 2 }];
    scope.getStuff(); //Just moved this from after expectGET
    httpLocalBackend.expectGET(url).respond(200, httpResponse);
    httpLocalBackend.flush();
    expect($scope.stuff.length).toBe(2);
} );

试试这个.

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