angularjs - Angular 模拟$ httpBackend没有给出任何刷新请求

Question

按照angularJS $httpBackend的官方指南，我将进行此测试，但Karma会给我这个错误:Error: No pending request to flush !
at Function.$httpBackend.flush
测试

'use strict';

describe('profileCtrl', function () {
var scope, $httpBackend;

beforeEach(angular.mock.module('maap'));
beforeEach(angular.mock.inject(function($rootScope, $controller, _$httpBackend_){

    $httpBackend = _$httpBackend_;
    $httpBackend.when('GET', 'profile').respond([{id: 1, name: 'Bob'}]);
    scope = $rootScope.$new();
    $controller('profileCtrl', {$scope: scope});
}))

it('should fetch list of users', function(){
    $httpBackend.flush();
    expectGET(scope.current_user.length).toBe(1);
    expect(scope.current_user[0].name).toBe('Bob');
});

});

对于这个简单的 Controller :

'use strict';

 angular.module('maap').controller('profileCtrl', function($scope, UserService) {

$scope.current_user = UserService.details(0);

});

Answer 1

_$httpBackend_没有要刷新的内容，因为您没有在测试中发出任何http请求。

您需要调用一些发出http请求的代码。

然后，一旦您的测试中某处发出了http请求，就可以调用flush方法，以便为已发出的请求提供响应。

就像是:

it('should fetch list of users', function(){

    // Do something that will make an http request
    MyService.getAllUser(function ...) // for example

    // Then provide a response for the http request that 
    // has been made when getAllUser was called
    $httpBackend.flush();

    // Check the expected result.
    expect(something).toBe('Bob');
});