使用 supertest 启动和停止服务器

Question

我有以下服务器 class :

import express, { Request, Response } from 'express';

export default class Server {
  server: any;

  exp: any;

  constructor() {
    this.exp = express();
    this.exp.get('/', (_req: Request, res: Response) => {
      res.json('works');
    });
  }

  start(): void {
    this.server = this.exp.listen(3000);
  }

  stop(): void {
    this.server.close();
  }
}

我正在使用 supertest 进行端到端测试。我希望在所有测试之前启动我的应用程序并在测试完成后停止它。

使用 beforAll 和 afterAll 很容易做到这一点，我只需一次实例化服务器 class 并调用启动和关闭方法。

但是因为我有 10 多个控制器要测试，所以我想避免在每个测试文件期间启动和停止服务器。

我在文档中找到 setupFiles 和 setupFilesAfterEnv 但我无法停止服务器，因为实例不是 "shared"在两个文件中。

这是 1 个测试文件的示例：

import supertest from 'supertest';

describe('Album Test', () => {
   let app: App;

   beforeAll(async (done) => {
     app = new App();

     await app.setUp(); // database connection (not mentionned in the preivous example)
     done();
   });

   afterAll(async (done) => {
     await app.close();

     app.server.stop();
     done();
   });

  const api = supertest('http://localhost:3000');

  it('Hello API Request', async () => {
    const result = await api.get('/v1/user');
    expect(result.status).toEqual(200);
    ...
  });
});

这完全没问题，但我在每个测试文件中复制了 beforeAll 和 afterAll 方法。有没有办法只声明一次？

谢谢

Answer 1

您可以使用 setupFiles to set up test fixtures globally. You can assign variables that you want to use in multiple test files to Node.js global 对象。

例如

app.ts:

import express, { Request, Response } from 'express';

export default class Server {
  server: any;

  exp: any;

  constructor() {
    this.exp = express();
    this.exp.get('/', (_req: Request, res: Response) => {
      res.json('works');
    });
  }

  start(): void {
    this.server = this.exp.listen(3000);
  }

  stop(): void {
    this.server.close();
  }
}

app.setup.js:

const App = require('./app').default;

beforeAll(() => {
  global.app = new App();
  global.app.exp.set('test setup', 1);
  console.log('app setup');
});

afterAll(() => {
  console.log('app stop');
});

jest.config.js:

module.exports = {
  preset: 'ts-jest/presets/js-with-ts',
  testEnvironment: 'node',
  setupFilesAfterEnv: [
    './jest.setup.js',
    '/Users/ldu020/workspace/github.com/mrdulin/react-apollo-graphql-starter-kit/Whosebug/61659975/app.setup.js',
  ],
  testMatch: ['**/?(*.)+(spec|test).[jt]s?(x)'],
  verbose: true,
};

a.controller.test.js:

describe('controller a', () => {
  it('should pass', () => {
    console.log('test setup:', global.app.exp.get('test setup'));
    expect(1 + 1).toBe(2);
  });
});

b.controller.test.js:

describe('controller b', () => {
  it('should pass', () => {
    console.log('test setup:', global.app.exp.get('test setup'));
    expect(1 + 1).toBe(2);
  });
});

单元测试结果：

 PASS  Whosebug/61659975/a.controller.test.js
  controller a
    ✓ should pass (5ms)

  console.log
    app setup

      at Object.<anonymous> (Whosebug/61659975/app.setup.js:6:11)

  console.log
    app setup

      at Object.<anonymous> (Whosebug/61659975/app.setup.js:6:11)

  console.log
    test setup: 1

      at Object.<anonymous> (Whosebug/61659975/b.controller.test.js:3:13)

  console.log
    test setup: 1

      at Object.<anonymous> (Whosebug/61659975/a.controller.test.js:3:13)

  console.log
    app stop

      at Object.<anonymous> (Whosebug/61659975/app.setup.js:10:11)

  console.log
    app stop

      at Object.<anonymous> (Whosebug/61659975/app.setup.js:10:11)

 PASS  Whosebug/61659975/b.controller.test.js
  controller b
    ✓ should pass (3ms)

Test Suites: 2 passed, 2 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        6.749s, estimated 12s

Answer 2

试一试它有效

const supertest = require('supertest')
const app = require('../../app')

describe('int::app', function(){

  let request = null
  let server = null

  before(function(done){
    server = app.listen(done)
    request = supertest.agent(server)
  })

  after(function(done){
    server.close(done)
  })

  it('should get /api/v1/laps/85299', function(){
    return request.get('/api/v1/laps/85299')
      .expect(200, { data: {} })
  })

})

使用 supertest 启动和停止服务器

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