javascript - super 测试未找到错误测试快速端点

Question

我尝试设置 jest、supertest 和express，但失败了。我有这 2 个简单文件

index.js

const express = require("express");
const app = express();
const port = 3000;

app.get("/", (req, res) => res.send("Hello World!"));

app.listen(port, () => console.log(`Example app listening on port ${port}!`));

和index.test.js

const express = require("express");
const app = express();
const request = require("supertest");

describe("/", () => {
  test("it says hello world", done => {
    request(app)
      .get("/")
      .expect(200)
      .end(function(err, res) {
        console.log("err", err);
      });
  });
});

当我运行测试时，我收到此错误。 err 错误:预期 200“OK”，得到 404“Not Found”

出了什么问题？

我在浏览器中访问 localhost:3000 我可以看到“Hello World!”

Answer 1

您应该重构index.js并创建app.js

app.js

const express = require("express");
const app = express();
app.get("/", (req, res) => res.send("Hello World!"));

index.js

const app = require('./app')
const port = process.env.PORT
app.listen(port, () => { console.log(`listening on ${port}) . })

我们这样重构代码的原因是我们需要访问express app()，但我们不希望调用“listen”。

in your test file

const request = require("supertest");
const app = require("../src/app");

describe("/", () => {
  test("it says hello world", done => {
    request(app)
      .get("/")
      .expect(200)
      .end(function(err, res) {
        console.log("err", err);
      });
  });
});