#### ApiTestingModule

An angular module for testing api calls and services.

### Usage

Import ApiTestingModule in any test spec:

    import {ApiTestingModule} from '@universis/common';
    
Add  ApiTestingModule.forRoot() in testing module configuration:

    describe('TestService', () => {
    
        let mockApi: ApiTestingController;
        beforeEach(async(() => {
            // noinspection JSIgnoredPromiseFromCall
            TestBed.configureTestingModule({
                imports: [
                    CommonModule,
                    MostModule.forRoot({
                        base: '/api/',
                        options: {
                            useMediaTypeExtensions: false
                        }
                    }),
                    ApiTestingModule.forRoot()
                ],
                providers: [
                    AuthenticationService,
                    {
                        provide: ConfigurationService,
                        useClass: TestingConfigurationService
                    }
                ],
                declarations: [
                ],
            }).compileComponents();
            // get api test controller
            mockApi = TestBed.get(ApiTestingController);
        }));
    }

and finally use ApiTestingController to handle api requests and responses.

    it('should use authentication callback', inject([AuthenticationService],
            async (authService: AuthenticationService) => {
            // add match url
            mockApi.match({
                url: '/api/users/me/',
                method: 'GET'
            }).map(request => {
                // register request mapper and return data
                request.flush({
                    id: 1,
                    name: 'user@example.com',
                    description: 'Test User',
                    groups: [
                        {
                            name: 'Administrators'
                        }
                    ]
                });
            });
            // call authentication service callback
            const result = await authService.callback('a-testing-token--');
            expect(result).toBeTruthy();
            expect(result.name).toBe('user@example.com');
        }));

or test error handling

    it('should throw token expired error', inject([AuthenticationService],
            async (authService: AuthenticationService) => {
                // add match url
                mockApi.match({
                    url: '/api/users/me/',
                    method: 'GET'
                }).map((request: TestRequest) => {
                    // register request mapper and return data
                    request.error(new ErrorEvent('Token Not Found'), {
                       status: 404,
                       statusText: 'Token Not Found'
                    });
                });
                // call authentication service callback
                authService.callback('a-testing-token--').then( result => {
                    expect(false).toBe(true, 'Expected an error to be thrown.');
                }).catch( err => {
                    expect(err).toBeTruthy();
                    expect(err.status).toBe(404);
                });
            }));