我正在使用Angular CLI来生成和服务项目。它似乎工作得很好——尽管对于我的小学习项目来说，它产生的东西比我需要的要多——但这是意料之中的。

我注意到它会为项目中的每个Angular元素(组件、服务、管道等)生成spec.ts。我到处找，但没有找到解释这些文件是干什么用的。

这些构建文件是使用tsc时通常隐藏的吗?我之所以这么想，是因为我想更改我创建的一个命名糟糕的组件的名称，并发现该名称也在这些spec.ts文件中被引用。

import {
  beforeEach,
  beforeEachProviders,
  describe,
  expect,
  it,
  inject,
} from '@angular/core/testing';
import { ComponentFixture, TestComponentBuilder } from '@angular/compiler/testing';
import { Component } from '@angular/core';
import { By } from '@angular/platform-browser';
import { PovLevelComponent } from './pov-level.component';

describe('Component: PovLevel', () => {
  let builder: TestComponentBuilder;

  beforeEachProviders(() => [PovLevelComponent]);
  beforeEach(inject([TestComponentBuilder], function (tcb: TestComponentBuilder) {
    builder = tcb;
  }));

  it('should inject the component', inject([PovLevelComponent],
      (component: PovLevelComponent) => {
    expect(component).toBeTruthy();
  }));

  it('should create the component', inject([], () => {
    return builder.createAsync(PovLevelComponentTestController)
      .then((fixture: ComponentFixture<any>) => {
        let query = fixture.debugElement.query(By.directive(PovLevelComponent));
        expect(query).toBeTruthy();
        expect(query.componentInstance).toBeTruthy();
      });
  }));
});

@Component({
  selector: 'test',
  template: `
    <app-pov-level></app-pov-level>
  `,
  directives: [PovLevelComponent]
})
class PovLevelComponentTestController {
}