Jest&supertest API 测试返回 TypeError: app.address is not a function

Question

我目前正在制作一个带有打字稿、节点、快递的 API，并使用 jest 和 supertest 进行测试。我在使用 Javascript 时没有问题，但我最近将我的项目文件从 JS 更改为 TS，包括测试文件，当我开始测试时，我在所有测试套件中的超级测试请求部分都收到以下错误，这是其中之一当我开始测试时，我的终端上的测试套件。

  TypeError: app.address is not a function

  37 |     it("should return 400 if email is invalid", async () => {
  38 |       const res = await request(server)
> 39 |         .post("/api/users/auth/register")
     |          ^
  40 |         .send({
  41 |           email: "nomail",
  42 |           password: "validpassword123",

这是我的测试文件auth.test.ts：

import * as request from 'supertest';
import { User } from '../../../../src/models/User';
import * as mongoose from 'mongoose';
import getKeys from '../../../../src/config/keys';

describe("/api/users/auth", () => {
  let server;
  let accessToken = "Bearer accessToken";
  let email;
  let password;

  beforeAll(async () => {
    server = import('../../../../src/index')
    await mongoose.connect(getKeys().mongoURI);
  })

  afterAll(async () => {
    await server.close();
    await mongoose.disconnect();
  })

  it("should return 400 if email is invalid", async () => {
    const res = await request(server)
      .post("/api/users/auth/register")
      .send({
        email: "nomail",
        password: "validpassword123",
        name: "name"
      });

    expect(res.status).toBe(400);
    expect(res.body).toHaveProperty('errArray')
  });
}

这是我的 src/index.ts 文件，它是入口点。

import * as express from 'express';
import * as passport from 'passport';
import * as bodyParser from 'body-parser';
import * as path from 'path';
import * as session from 'express-session';
import getKeys from './config/keys';

const port = 3001 || process.env.PORT;
const server = app.listen(port, () =>
  console.log(`Server running on port ${port}`)
);


export default server;

我尝试将导出和导入服务器语法更改为所有 commonjs 语法，并安装和设置与此相关的所有依赖项，包括 @types/supertest、@types/jest、ts-jest，这是我的设置 jest.config.js

module.exports = {
  verbose: true,
  testURL: 'http://localhost',
  testEnvironment: "node",
  roots: [
    "<rootDir>"
  ],
  transform: {
    "^.+\\.tsx?$": "ts-jest"
  },
  testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
  globals: {
    "ts-jest": {
      "tsConfigFile": "tsconfig.json"
    }
  },
  moduleFileExtensions: [
    "ts",
    "tsx",
    "js",
    "jsx",
    "json",
    "node"
  ],

}

配置文件

 {
  "compilerOptions": {
    "outDir": "./dist",
    "moduleResolution": "node",
    "sourceMap": true,
    "module": "commonjs",
    "allowJs": true,
    "target": "es5",
    "noUnusedParameters": false,
    "allowUnreachableCode": true,
    "allowUnusedLabels": true,
    "types": [
      "jest",
      "node",
      "express",
      "mongoose",
      "body-parser",
      "supertest"
    ],
    "lib": [
      "es2015"
    ]
  },
  "include": [
    "./src/**/*",
    "index.ts"
  ],
  "exclude": [
    "./node_modules",
    "**/*.spec.ts",
    "**/*.test.ts"
  ]
}

包.json

    "scripts": {
    "test": "jest --watchAll --runInBand",
    "coverage": "jest --coverage",
    "start": "ts-node src/index.ts",
    "server": "./node_modules/nodemon/bin/nodemon.js",
    "client": "npm start --prefix ../client",
    "dev": "concurrently \"npm run server\" \"npm run client\""
  },
"devDependencies": {
"@types/body-parser": "^1.17.0",
"@types/express": "^4.16.0",
"@types/jest": "^23.3.12",
"@types/mongoose": "^5.3.7",
"@types/node": "^10.12.18",
"@types/supertest": "^2.0.7",
"jest": "^23.6.0",
"nodemon": "^1.18.9",
"supertest": "^3.3.0",
"ts-jest": "^23.10.5",
"ts-node": "^7.0.1",
"typescript": "^3.2.2"
}

Answer 1

原因是你server传入的supertest是undefined。supertest将app.address()在内部使用，请参阅这一行。这就是它抛出错误的原因：

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类型错误：app.address 不是函数

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如果你想server动态导入，你应该改变：

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let server;\nbeforeAll(async () => {\n  server = import(\'../../../../src/index\')\n})\n

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到：

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let server;\nbeforeAll(async () => {\n  const mod = await import(\'../../../../src/index\');\n  server = (mod as any).default;\n});\n

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例如

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index.ts:

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import express from \'express\';\n\nconst app = express();\n\napp.post(\'/api/users/auth/register\', (req, res) => {\n  res.status(400).json({ errArray: [] });\n});\n\nconst port = 3001 || process.env.PORT;\nconst server = app.listen(port, () => console.log(`Server running on port ${port}`));\n\nexport default server;\n

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index.test.ts:

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import request from \'supertest\';\n\ndescribe(\'/api/users/auth\', () => {\n  let server;\n  beforeAll(async () => {\n    const mod = await import(\'./\');\n    server = (mod as any).default;\n  });\n\n  afterAll((done) => {\n    if (server) {\n      server.close(done);\n    }\n  });\n\n  it(\'should return 400 if email is invalid\', async () => {\n    const res = await request(server)\n      .post(\'/api/users/auth/register\')\n      .send({\n        email: \'nomail\',\n        password: \'validpassword123\',\n        name: \'name\',\n      });\n\n    expect(res.status).toBe(400);\n    expect(res.body).toHaveProperty(\'errArray\');\n  });\n});\n

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集成测试结果与覆盖率报告：

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\xe2\x98\x81  jest-codelab [master] \xe2\x9a\xa1  npx jest --coverage --verbose /Users/ldu020/workspace/github.com/mrdulin/jest-codelab/src/stackoverflow/54230886/index.test.ts\n PASS  src/stackoverflow/54230886/index.test.ts (10.306s)\n  /api/users/auth\n    \xe2\x9c\x93 should return 400 if email is invalid (56ms)\n\n  console.log src/stackoverflow/54230886/index.ts:437\n    Server running on port 3001\n\n----------|----------|----------|----------|----------|-------------------|\nFile      |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |\n----------|----------|----------|----------|----------|-------------------|\nAll files |      100 |       50 |      100 |      100 |                   |\n index.ts |      100 |       50 |      100 |      100 |                 9 |\n----------|----------|----------|----------|----------|-------------------|\nTest Suites: 1 passed, 1 total\nTests:       1 passed, 1 total\nSnapshots:   0 total\nTime:        11.875s\n

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源代码：https ://github.com/mrdulin/jest-codelab/tree/master/src/stackoverflow/54230886

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