如何在构造函数中使用参数测试angular2类/服务？

import { TestBed } from '@angular/core/testing';
import { ExampleService } from './example.service';

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

  beforeEach(() => {
    TestBed.configureTestingModule({});
    service = TestBed.inject(ExampleService);
  });

  // 测试用例...
});

beforeEach(() => {
  TestBed.configureTestingModule({
    providers: [
      { provide: SomeDependency, useClass: MockDependency }
    ]
  });
  service = TestBed.inject(ExampleService);
});

it('should create an instance', () => {
  expect(service).toBeTruthy();
});