msw/test/node/msw-api/setup-server/scenarios/custom-interceptors.node.test.ts

// @vitest-environment node
import nodeHttp from 'node:http'
import { HttpResponse, http } from 'msw'
import { SetupServerApi } from 'msw/node'
import { FetchInterceptor } from '@mswjs/interceptors/fetch'
import { waitForClientRequest } from '../../../../support/utils'

const server = new SetupServerApi(
  [
    http.get('http://localhost', () => {
      return HttpResponse.text('hello world')
    }),
  ],
  [new FetchInterceptor()],
)

beforeAll(() => {
  server.listen()
})

afterAll(() => {
  server.close()
})

test('uses only the provided interceptors', async () => {
  {
    const response = await fetch('http://localhost')

    // Must receive a mocked response per the defined interceptor + handler.
    expect(response.status).toBe(200)
    await expect(response.text()).resolves.toBe('hello world')
  }

  {
    const request = nodeHttp.get('http://localhost')
    const requestPromise = waitForClientRequest(request)

    // Must receive a connection error since no intereceptor handles this client.
    await expect(requestPromise).rejects.toThrow('ECONNREFUSED')
  }
})