如何在 Angular 7 中的每个业力/茉莉花测试之前将服务注入到自定义类中

Question

嗨，我正在尝试测试自定义类实例化，我在同一个规范文件中进行了多个测试，这就是为什么使用 beforeEach 方法，我也使用inject方法来获取我的类所需的服务，但是当我运行测试时，var appointmentCreationVehicle未定义这是我的代码：

describe('AppointmentCreationVehicle', () => {
  let appointmentCreationVehicle: AppointmentCreationVehicle;
  beforeAll(() => {
    TestBed.configureTestingModule({
      imports: [AppModule]
    })
    .compileComponents();
  });
  beforeEach(
    inject([AppointmentCreationVehicle], (vehicleRestService: VehicleRestService) => {
      appointmentCreationVehicle = new AppointmentCreationVehicle(vehicleRestService);
    })
  );
  it('should create an instance',() => {
      expect(appointmentCreationVehicle).toBeTruthy();
  });

那么我的业力.js看起来像这样：

module.exports = function (config) {
    config.set({
        basePath: '',
        frameworks: ['jasmine', '@angular-devkit/build-angular'], 
        plugins: [
            require('karma-jasmine'),
            require('karma-firefox-launcher'),
            require('karma-mocha-reporter'),
            require('@angular-devkit/build-angular/plugins/karma')
        ],
        client: {
            clearContext: false, // leave Jasmine Spec Runner output visible in browser
            jasmine: {
                random: false
            },            
            captureConsole: true,
            mocha: {
                bail: true
            }        
        },
        reporters: ['mocha'],
        port: 9876,
        colors: true,
        logLevel: config.LOG_INFO,
        autoWatch: false,
        browsers: ['HeadlessFirefox'],
        singleRun: true,
        customLaunchers: {
            HeadlessFirefox: {
                base: 'Firefox',
                flags: ['-headless']
            },
            ChromeDebugging: {
                base: 'Chrome',
                flags: ['--remote-debugging-port=9876']
            }
        }
    });
};

是否有可能在执行后结束服务的注入？如果我展示，我怎样才能避免这种行为。

Answer 1

您没有将提供程序导入测试平台：

beforeAll(() => {
  TestBed.configureTestingModule({
    providers: [...] // <---------- HERE
  })
  .compileComponents();
});

之后，让它更简单：使用测试平台！它包含一个依赖关系的一周映射：

const myServiceInstance = TestBed.get(MyService);