$httpBackend.verifyNoOutstandingExpectation()的问题

Question

最近，我已经开始使用Karma +Karma编写单元测试，但是我在以下测试中遇到了问题：

describe("WEBSERVICE:", function () {

    var webservice,
        $httpBackend,
        authRequestHandler,
        webserviceURL = "http://localhost:8006/";


    beforeEach(inject(function (Webservice, $injector) {
        webservice = Webservice;
        $httpBackend = $injector.get("$httpBackend");


        authRequestHandler = $httpBackend
            .when("GET", webserviceURL + "users/login")
            .respond(200, "ok");
    }));


    afterEach(function() {
        $httpBackend.verifyNoOutstandingExpectation();
        $httpBackend.verifyNoOutstandingRequest();
    });


    it("should EXISTS", function () {
        expect(webservice).toBeDefined();
    });


    it("should throw a WebserviceError if we are not logged in" , function () {
        expect(function () {
            webservice.item("negs", "RPT");
        }).toThrow(webserviceAuthenticationError);
    });


    it("should NOT HAVE credentials when instantiated", function () {
        expect(webservice.hasCredentials()).toBeFalsy();
    });


    it("should log in when valid credentials are given", function () {
        $httpBackend.expectGET("users/login");
        webservice.withCredentials("sam", "password");
    });
});

由于在我删除所有测试时都通过了测试，因此造成问题的原因如下：

afterEach(function() {
    $httpBackend.verifyNoOutstandingExpectation();
    $httpBackend.verifyNoOutstandingRequest();
});

我只是想知道是否有人能帮我这个忙。非常感谢。

Answer 1

你有问题的原因是

$httpBackend.verifyNoOutstandingExpectation();

是因为你最后一次考试

it("should log in when valid credentials are given", function () {
    $httpBackend.expectGET("users/login");
    webservice.withCredentials("sam", "password");
});

有不满意的请求，您可以在这个小提琴中看到

Error: Unsatisfied requests: GET users/login

如果你评论掉

$httpBackend.verifyNoOutstandingExpectation() 

您的前三个测试通过了，但最后一个是琥珀，因为没有期望，请参阅此小提琴。

WEBSERVICE:
should EXISTS
should throw a WebserviceError if we are not logged in
should NOT HAVE credentials when instantiated
SPEC HAS NO EXPECTATIONS should log in when valid credentials are given

在“AngularJS 文档”中，它说

verifyNoOutstandingExpectation()；

验证通过expect api定义的所有请求是否都已发出。如果没有发出任何请求，verifyNoOutstandingExpectation将抛出一个异常。

您将需要重组该测试，以便

webservice.withCredentials("sam"，“密码”)；

通过$httpBackend发出请求