koa 应用程序的 Jest 测试收到错误“TypeError: app.address is not a function”

Question

我想创建我的测试。我用 koa.js 和我的 server.ts 文件构建了一个服务器：

import Koa from "koa";
import jwt from "koa-jwt";
import bodyParser from "koa-bodyparser";

...
...


    const app = new Koa();

    
    app.use(helmet.contentSecurityPolicy({
        directives: {
            defaultSrc: ["'self'"],
            scriptSrc: ["'self'", "'unsafe-inline'", "cdnjs.cloudflare.com"],
            styleSrc: ["'self'", "'unsafe-inline'", "cdnjs.cloudflare.com", "fonts.googleapis.com"],
            fontSrc: ["'self'", "fonts.gstatic.com"],
            imgSrc: ["'self'", "data:", "online.swagger.io", "validator.swagger.io"]
        }
    }));

    
    app.use(cors());


    app.use(logger(winston));


    app.use(bodyParser());

    app.use(unprotectedRouter.routes()).use(unprotectedRouter.allowedMethods());

    app.use(jwt({ secret: config.jwtSecret }).unless({ path: [/^\/swagger-/] }));

    app.use(protectedRouter.routes()).use(protectedRouter.allowedMethods());

    cron.start();

    app.listen(config.port, () => {
        console.log(`Server running on port ${config.port}`);
    });
    export default app;

我的 test.ts 文件是这样的：

import request from 'supertest';
import app from '../../src/server';

describe('basic route tests', () => {
    test('get home route GET /', async () => {
    const response = await request(app).get('/');
    expect(response.status).toEqual(200);
    expect(response.text).toContain('Hello World!');
    });
});

所以，我收到一个错误：

为什么我收到这个错误？我认为问题发生在导出应用程序时。 我该如何解决这个错误？