如何在Angular 7的beforeEach Karma/Jasmine测试中将服务注入到自定义类中？

import { TestBed } from '@angular/core/testing';
import { YourService } from 'your-service-path';
import { YourCustomClass } from 'your-custom-class-path';

beforeEach(() => {
  TestBed.configureTestingModule({
    providers: [
      YourService
    ]
  });
});

beforeEach(() => {
  TestBed.configureTestingModule({
    providers: [
      YourService
    ]
  });

  const yourService = TestBed.get(YourService);
  yourCustomClass = new YourCustomClass(yourService);
});

export class YourCustomClass {
  constructor(private yourService: YourService) {
    // 在这里可以使用yourService进行操作
  }
}