redux-example-test.js

const configureMockStore = require('redux-mock-store').default;
const thunk = require('redux-thunk').default;
const nock = require('../');
const expect = require('expect'); // You can use any testing library
const fetch = require('isomorphic-fetch');

function fetchTodosRequest() {
  return {
    type: 'FETCH_TODOS_REQUEST'
  }
}

function fetchTodosSuccess(body) {
  return {
    type: 'FETCH_TODOS_SUCCESS',
    body
  }
}

function fetchTodosFailure(ex) {
  return {
    type: 'FETCH_TODOS_FAILURE',
    ex
  }
}

function fetchTodos() {
  return dispatch => {
    dispatch(fetchTodosRequest())
    return fetch('http://example.com/todos')
      .then(res => res.json())
      .then(json => dispatch(fetchTodosSuccess(json.body)))
      .catch(ex => dispatch(fetchTodosFailure(ex)))
  }
}

const middlewares = [ thunk ]
const mockStore = configureMockStore(middlewares)

nock('http://example.com/')
  .get('/todos')
  .reply(200, { body: { todos: ['do something'] }})

const expectedActions = [
  { type: 'FETCH_TODOS_REQUEST' },
  { type: 'FETCH_TODOS_SUCCESS', body: { todos: ['do something']  } }
]
const store = mockStore({ todos: [] })

store.dispatch(fetchTodos())
  .then(() => { // return of async actions
    expect(store.getActions()).toEqual(expectedActions);
    expect(nock.isDone()).toEqual(true);
  })