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lang: ja-jp
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# TypeScript NestJS NestExpressApplication で Hello World　2021-05-17

$ sudo npm install -g @nestjs/cli

## プロジェクトの作成

nest new [project-name]

## 実行

npm start

または、

yarn start

## 確認

http://localhost:3000/


## テストの実行

npm test

または、

yarn test

## テストに失敗した場合

$ npm test

> nestjs-001@0.0.1 test
> jest

 FAIL  src/app.controller.spec.ts
  AppController
    root
      ✕ should return "Hello World!" (13 ms)

  ● AppController › root › should return "Hello World!"

    expect(received).toBe(expected) // Object.is equality

    Expected: "こんにちは世界？？"
    Received: "こんにちは世界！！"

      17 |   describe('root', () => {
      18 |     it('should return "Hello World!"', () => {
    > 19 |       expect(appController.getHello()).toBe('こんにちは世界？？');
         |                                        ^
      20 |     });
      21 |   });
      22 | });

      at Object.<anonymous> (app.controller.spec.ts:19:40)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        2.454 s
Ran all test suites.

###### tags: `TypeScript` `NestJS` `NestExpressApplication` `Hello World`