$httpBackend.verifyNoOutstandingExpectation() 的问题

Question

我最近开始使用 Karma + Karma-jasmine 编写单元测试，但我在以下测试中遇到问题：

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");
    });
});

似乎是以下内容造成了问题，因为当我删除它时所有测试都通过了：

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

我只是想知道是否有人可以帮助我解决这个问题。非常感谢。

Answer 1

您遇到问题的原因是

$httpBackend.verifyNoOutstandingExpectation();

由于您上次测试

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

有未满足的请求，您可以在此看到 jsfiddle

Error: Unsatisfied requests: GET users/login

如果你注释掉

$httpBackend.verifyNoOutstandingExpectation()

您的前三个测试通过，但最后一个是琥珀色，因为没有预期，请参阅此 fiddle。

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 documentation 中说

verifyNoOutstandingExpectation();

验证是否已发出通过预期 api 定义的所有请求。如果未发出任何请求，verifyNoOutstandingExpectation 将引发异常。

您需要重组该测试，以便

webservice.withCredentials("sam", "password");

通过$httpBackend

提出请求

$httpBackend.verifyNoOutstandingExpectation() 的问题

Problems with $httpBackend.verifyNoOutstandingExpectation()

jasmine

jasmine-node

karma-runner

karma-jasmine