無法使用$ httpBackend測試POST $ http請求

Question

嘗試通過單元測試覆蓋我的應用的http請求。我使用Jasmine和Karma，並一步一步地使用本教程編寫我的代碼：https://docs.angularjs.org/api/ngMock/service/ $ httpBackend。但是，我得到一個錯誤：

Error: No pending request to flush ! 
     at Function.$httpBackend.flush (eval at <anonymous> (app/index.js:105:1), <anonymous>:1839:41) 
     at Object.eval (eval at <anonymous> (app/index.js:137:1), <anonymous>:37:20) 

這個答案Unit testing AngularJS controller with $httpBackend是我的問題很普遍，但是當我移動const controller = createController();下來 - 我有另外一個錯誤：Error: Unsatisfied requests: POST http://loalhost:5000/register。

我的錯誤在哪裏？我執行錯了什麼？

我的單元測試：

$scope.status; 
    $scope.isFetching = false; 

    const handleResponse = response => { 
    $scope.status = response.status; 
    $scope.isFetching = false; 
    }; 

    $scope.next = (email, password) => { 
    $scope.isFetching = true; 
    $http 
     .post('http://localhost:5000/register', { email, password }) 
     .then(response => handleResponse(response)) 
     .catch(response => handleResponse(response)); 
    }; 

UPD

我也嘗試過每一個$httpBackend.flush()之前添加這一個（喜歡這裏Angularjs testing (Jasmine) - $http returning 'No pending request to flush'：

beforeEach(window.module(ngModule.name)); 

let $httpBackend, $rootScope, $controller, $scope, createController; 

beforeEach(
    inject($injector => { 
    $httpBackend = $injector.get('$httpBackend'); 
    $controller = $injector.get('$controller'); 
    $rootScope = $injector.get('$rootScope'); 
    $scope = $rootScope.$new(); 

    createController =() => 
     $controller('RegistrationController', { $scope }); 
    }) 
); 

afterEach(() => { 
    $httpBackend.verifyNoOutstandingExpectation(); 
    $httpBackend.verifyNoOutstandingRequest(); 
}); 

it('should successfully register user',() => { 
    const controller = createController(); 
    $httpBackend.flush(); 
    $httpBackend.expectPOST('http://localhost:5000/register').respond(); 
    $scope.next('hello@gmail.com', '123456'); 
    $httpBackend.flush(); 
}); 

從控制器的代碼塊）：

if(!$rootScope.$$phase) { 
    $rootScope.$apply(); 
} 

但無論如何，沒有什麼改變。

Answer 1

您控制器創建這裏後調用$ httpBackend.flush（）：

it('should successfully register user',() => { 
    const controller = createController(); 
    $httpBackend.flush(); //<-- this is not necessary if controller creation doesn't involve $http calls 
    $httpBackend.expectPOST('http://loalhost:5000/register').respond(); 
    $scope.next('hello@gmail.com', '123456'); 
    $httpBackend.flush(); 
}); 

應該是這樣的：

it('should successfully register user',() => { 
    const controller = createController(); 
    $httpBackend.expectPOST('http://loalhost:5000/register').respond(); 
    $scope.next('hello@gmail.com', '123456'); 
    $httpBackend.flush(); 
});