如何使用Angular 4 Jasmine單元測試用例覆蓋IF / ELSE條件

Question

幫助我涵蓋IF / Else覆蓋率以及返回HTTP響應的方法，還幫助構造函數覆蓋Jasmine單元測試用例的路由器和Appconfig服務的分支覆蓋率

Answer 1

您可以使用MockBackend參考來模擬http響應： https ://angular.io/api/http/testing/MockBackend

您可以輕松定義自己的響應並測試所有是否

// before each test 
beforeEach(() => {
    this.injector = ReflectiveInjector.resolveAndCreate([
      {provide: ConnectionBackend, useClass: MockBackend},
      {provide: RequestOptions, useClass: BaseRequestOptions},
      Http,
      // other dependencies like Router / AppConfig
    ]);
    this.authenticationService = this.injector.get(AuthenticationService);
    this.backend = this.injector.get(ConnectionBackend) as MockBackend;
    this.backend.connections.subscribe((connection: any) => this.lastConnection = connection);   
});


// in your test
const mockErrorResponse = {status: 200};
this.lastConnection.mockRespond(new Response(new ResponseOptions({body: JSON.stringify(mockErrorResponse)})));
tick();