开玩笑的测试说“ ReferenceError：标头未定义”

Question

我正在尝试测试与Headers类交互的函数。不知道我的测试在技术上是否属于 unit -test的类别，但这应该无关。

运行测试时，我看到了臭名昭著的ReferenceError: Headers is not defined错误。我确定是因为测试是在非浏览器环境中执行的。

我的问题是： 如何在浏览器环境中执行测试，因为我根本不想模拟Headers类？

$ yarn test                                                                         
yarn run v1.12.3                                                                    
$ jest                                                                              
 FAIL  __tests__/request-init-spec.ts                                     
  requestInit                                                               
    × should work (9ms)                                                             

  ● requestInit › should work                                               

    ReferenceError: Headers is not defined                                          

      13 | describe(requestInit.name, () => {                               
      14 |   it('should work', () => {                                              
    > 15 |     const headers = new Headers();                                       
         |                     ^                                                    
      16 |     headers.append('H1', 'V1');                                          
      17 |                                                                          
      18 |     const requestInit: RequestInit = {                                   

      at Object.it (__tests__/request-init-spec.ts:15:21)                 

Test Suites: 1 failed, 1 total                                                      
Tests:       1 failed, 1 total                                                      
Snapshots:   0 total                                                                
Time:        4.574s                                                                 
Ran all test suites.                                                                
error Command failed with exit code 1.                                              
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.