import { logUserIn, logUserOut } from './actions' import userReducer from './user-reducer' test('userReducer', () => { let state expect(userReducer(state)).toEqual(null) state = userReducer(state, logUserIn({ a: 'a' })) expect(state).toEqual({ a: 'a' }) state = userReducer(state, logUserOut()) expect(state).toEqual(null) })