角度单元测试错误(未定义$)

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

beforeEach(() => {
  TestBed.configureTestingModule({
    providers: [/* 注入所需的依赖项 */]
  });
});

beforeEach(() => {
  TestBed.configureTestingModule({
    providers: [
      /* 注入所需的依赖项，包括Angular的内置服务 */
    ]
  });
});

beforeEach(() => {
  TestBed.configureTestingModule({
    declarations: [/* 声明要测试的控制器或组件 */],
    providers: [/* 注入所需的依赖项 */]
  });
});

beforeEach(() => {
  TestBed.configureTestingModule({
    providers: [/* 注入所需的依赖项 */]
  });
});

it('should do something', inject([/* 依赖项 */], (dependency) => {
  // 使用依赖项进行测试
}));