kimuraz/jest-moxios

Mock axios requests for testing with jest

moxios

Mock axios requests for testing

Installing

$ npm install moxios --save-dev

Example

import axios from 'axios'
import moxios from 'moxios'
import sinon from 'sinon'
import { equal } from 'assert'

describe('mocking axios requests', function () {

  describe('across entire suite', function () {

    beforeEach(function () {
      // import and pass your custom axios instance to this method
      moxios.install()
    })

    afterEach(function () {
      // import and pass your custom axios instance to this method
      moxios.uninstall()
    })

    it('specify response for a specific request', function (done) {
      let input = document.querySelector('.UserList__Filter__Input')
      let button = document.querySelector('.UserList__Filter__Button')

      input.value = 'flintstone'
      button.click()

      // Elsewhere in your code axios.get('/users/search', { params: { q: 'flintstone' } }) is called

      moxios.wait(function () {
        let request = moxios.requests.mostRecent()
        request.respondWith({
          status: 200,
          response: [
            { id: 1, firstName: 'Fred', lastName: 'Flintstone' },
            { id: 2, firstName: 'Wilma', lastName: 'Flintstone' }
          ]
        })
          .then(function () {
            let list = document.querySelector('.UserList__Data')
            equal(list.rows.length, 2)
            equal(list.rows[0].cells[0].innerHTML, 'Fred')
            equal(list.rows[1].cells[0].innerHTML, 'Wilma')
            done()
          })
      })
    })

    it('stub response for any matching request URL', function (done) {
      // Match against an exact URL value
      moxios.stubRequest('/say/hello', {
        status: 200,
        responseText: 'hello'
      })

      // Alternatively URL can be a RegExp
      moxios.stubRequest(/say.*/, {/* … */})

      let onFulfilled = sinon.spy()
      axios.get('/say/hello').then(onFulfilled)

      moxios.wait(function () {
        equal(onFulfilled.getCall(0).args[0].data, 'hello')
        done()
      })
    })

  })

  it('just for a single spec', function (done) {
    moxios.withMock(function () {
      let onFulfilled = sinon.spy()
      axios.get('/users/12345').then(onFulfilled)

      moxios.wait(function () {
        let request = moxios.requests.mostRecent()
        request.respondWith({
          status: 200,
          response: {
            id: 12345, firstName: 'Fred', lastName: 'Flintstone'
          }
        })
          .then(function () {
            equal(onFulfilled.called, true)
            done()
          })
      })
    })
  })

  it('Should reject the request', function (done) {
    const errorResp = {
      status: 400,
      response: { message: 'invalid data' }
    }

    moxios.wait(function () {
      let request = moxios.requests.mostRecent()
      request.reject(errorResp)
    })
      .catch(function (err) {
        equal(err.status, errorResp.status)
        equal(err.response.message, errorResp.response.message)
        done()
      })
  })
})

Mocking a axios.create() instance

describe('some-thing', () => {
  let axiosInstance;
  beforeEach(() => {
    axiosInstance = axios.create();
    moxios.install(axiosInstance);
  })
  afterEach(() => {
    moxios.uninstall(axiosInstance)
  })
  it('should axios a thing', (done) => {
    moxios.stubRequest('http://www.somesite.com/awesome-url', {
      status: 200,
      responseText: '…'
    })
    axiosInstance.get('http://www.somesite.com/awesome-url')
      .then(res => assert(res.status === 200))
      .finally(done)
  })
})

Thanks

moxios is heavily inspired by jasmine-ajax

License

MIT