duck.spec.js

import reducer, { types, actions, cycle } from './user'

describe('actions', () => {
  // snapshot tests
  it('should export specific action types', () => {
    expect(types).toMatchSnapshot()
  })
  it('should export specific action creators', () => {
    expect(actions).toMatchSnapshot()
  })
  
  // unit tests
  it('should create an action to set the email', () => {
    const email = 'john@doe.com'
    const expectedAction = {
      type: types.SET_EMAIL,
      payload: email
    }
    expect(actions.setEmail(email)).toEqual(expectedAction)
  })

  it('should create an action to set the password', () => {
    const password = '1234'
    const expectedAction = {
      type: types.SET_PASSWORD,
      payload: password
    }
    expect(actions.setPassword(password)).toEqual(expectedAction)
  })
})

describe('reducer', () => {
  // test the reducer as per :
  // https://github.com/reactjs/redux/blob/master/docs/recipes/WritingTests.md
})

describe('cycle', () => {
  // test I/O of the exported cycle
})