Jest test for Redux Reducers [Template]

reducers.spec.js

import configureStore from 'redux-mock-store'

import * as errorsActions from '../../../actions/errors'

import { mock_errors } from '../../../store/mock_data'

import setErrorMessage from '../set_error_message'
import resetErrorMessage from '../reset_error_message'

const middlewares = []
const mockStore = configureStore( middlewares )

const initialState = {}
const store = mockStore( initialState )

beforeEach( () => {
  store.clearActions();
} );

test( 'Select setErrorMessage reducer', () => {
  const { key, message } = mock_errors
  const action = errorsActions.setErrorMessage( key, message )

  expect( setErrorMessage( undefined, action ) ).toMatchSnapshot();
} );