Simulated web server for testing with Jest

Question

Simulated web server for testing with Jest

Can I ask a unique question? I have a tool for extracting data from webpages directly, not through APIs. I want to create end-to-end tests for this tool using the Jest library, but I need to ensure the web pages I'm referencing remain consistent. It's almost impossible to guarantee this with online resources.

Would it be a good idea to set up a local web server using express or fastify to serve static HTML pages for testing purposes, shutting it down once the tests are completed? Are there any other methods that are more effective?

I appreciate any advice you can provide. Thank you!

javascript jestjs mockwebserver

Answer 1

Answer №1

When setting up a mock server, you will need to utilize npm msw. To import it into your frontend, follow these steps:

import {setupServer} from "msw/node";
import {rest} from 'msw'

After importing, you can create a const server within your test function:

const server = setupServer(
    rest.get('/check_signup_email/*', (req, res, ctx) => {
      return res(ctx.json({result: 'ok', emails: []}))
    })
  )
  beforeAll(() => server.listen())
  afterEach(() => server.resetHandlers())
  afterAll(() => server.close())

Remember to close your server after each test and reopen it before the new test to avoid false results from tests being executed on previous variables.

Answer 2

When setting up a mock server, you will need to utilize npm msw. To import it into your frontend, follow these steps:

import {setupServer} from "msw/node";
import {rest} from 'msw'

After importing, you can create a const server within your test function:

const server = setupServer(
    rest.get('/check_signup_email/*', (req, res, ctx) => {
      return res(ctx.json({result: 'ok', emails: []}))
    })
  )
  beforeAll(() => server.listen())
  afterEach(() => server.resetHandlers())
  afterAll(() => server.close())

Remember to close your server after each test and reopen it before the new test to avoid false results from tests being executed on previous variables.

Simulated web server for testing with Jest

Answer №1

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