在我使用 Supertest 和 MSW 的测试中，我注意到，尽管它们仍然成功通过，但 MSW 已经开始显示 Supertest 发出的请求的警告。例如（请参阅帖子末尾的要复制的文件）：

$ npm t

> msw-example@1.0.0 test
> jest

 PASS  ./app.test.js
  password API
    ? exposes a number of words (76 ms)

  console.warn
    [MSW] Warning: captured a request without a matching request handler:

      • GET http://127.0.0.1:55984/api

    If you still wish to intercept this unhandled request, please create a request handler for it.
    Read more: https://mswjs.io/docs/getting-started/mocks

      at onUnhandledRequest (node_modules/msw/node/lib/index.js:7599:21)
      at node_modules/msw/node/lib/index.js:7630:13
      at fulfilled (node_modules/msw/node/lib/index.js:50:58)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        1.005 s
Ran all test suites.

请求GET http://127.0.0.1:55984/api是Supertest对应用程序提出的请求，这是测试的重点，而不是 MSW 需要处理的请求。当我第一次编写测试时也没有显示这些警告。

该链接页面显示了如何创建一个处理程序，但我不想给MSW处理这些请求。为什么会发生这种情况，我该如何阻止它显示"/api"呼叫警告？

package.json：

{
  "name": "msw-example",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "jest"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "axios": "^0.21.1",
    "express": "^4.17.1"
  },
  "devDependencies": {
    "jest": "^27.0.4",
    "msw": "^0.29.0",
    "supertest": "^6.1.3"
  }
}

app.js：

const axios = require("axios");
const express = require("express");

const app = express();

app.get("/api", (_, res) => {
  axios.get("https://api.pwnedpasswords.com/range/ABC12")
    .then(() => res.json({ words: 3 }))
    .catch((err) => res.sendStatus(500));
});

module.exports = app;

app.test.js：

const { rest } = require("msw");
const { setupServer } = require("msw/node");
const request = require("supertest");

const app = require("./app");

const server = setupServer(
  rest.get("https://api.pwnedpasswords.com/range/:range", (req, res, ctx) => {
    return res(ctx.status(200), ctx.text(""));
  }),
);

describe("password API", () => {
  beforeAll(() => server.listen());

  beforeEach(() => server.resetHandlers());

  afterAll(() => server.close());

  it("exposes a number of words", () => {
    return request(app).get("/api").expect(200).then((res) => {
      expect(res.body.words).toBe(3);
    });
  });
});

回答

beforeAll(() => server.listen({ onUnhandledRequest: "bypass" }));

beforeAll(() => server.listen({ 
  onUnhandledRequest: ({ method, url }) => {
    if (!url.pathname.startsWith("/api")) {
      throw new Error(`Unhandled ${method} request to ${url}`);
    }
  },
}));

describe("password API", () => {
  beforeAll(() => server.listen({ 
    onUnhandledRequest: ({ headers, method, url }) => {
      if (headers.get("User-Agent") !== "supertest") {
        throw new Error(`Unhandled ${method} request to ${url}`);
      }
    },
  }));

  beforeEach(() => server.resetHandlers());

  afterAll(() => server.close());

  it("exposes a number of words", () => {
    return request(app)
      .get("/api")
      .set("User-Agent", "supertest")
      .expect(200)
      .then((res) => {
        expect(res.body.words).toBe(3);
      });
  });
});