如何在angular 6单元测试中依赖注入接口

class MockInterface implements MyInterface {
  // 实现接口中的方法
  someMethod() {
    // 模拟的方法实现
  }
}

import { TestBed } from '@angular/core/testing';

describe('MyService', () => {
  let service: MyService;

  beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [
        { provide: MyInterface, useClass: MockInterface }
      ]
    });

    service = TestBed.inject(MyService);
  });

  it('should ...', () => {
    // 进行测试
  });
});