ReduxComponent.test.jsx

import React from 'react'
import { mount } from 'enzyme'
import { createStore } from 'redux'
import { Provider as StoreProvider, connect } from 'react-redux'

test('render form text field', () => {
  const changeTitle = title => ({
    type: 'CHANGE_TITLE',
    payload: { title },
  })

  const store = createStore(
    (state, action) => {
      switch (action.type) {
        case 'CHANGE_TITLE':
          return action.payload
        default:
          return state
      }
    },
    {
      title: 'First title',
    }
  )
  const Button = ({ title }) =>
    <div>
      {title}
    </div>

  const ConnectedButton = connect(state => ({
    title: state.title,
  }))(Button)

  const wrapper = mount(
    <StoreProvider store={store}>
      <ConnectedButton />
    </StoreProvider>
  )

  expect(wrapper.find('Button').props().title).toEqual('First title')

  store.dispatch(changeTitle('Second'))

  console.log(store.getState()) // Print "Second"

  expect(wrapper.update().find('Button').props().title).toEqual('Second') // Works!
})