it-incubator-todolist-ts-17-live-2024-08-17/src/app/app-reducer.test.ts

import {
  appReducer,
  InitialState,
  setAppError,
  setAppStatus,
} from './app-reducer'

let startState: InitialState

beforeEach(() => {
  startState = {
    error: null,
    status: 'idle',
    isInitialized: false,
  }
})

test('correct error message should be set', () => {
  const endState = appReducer(startState, setAppError('some error'))
  expect(endState.error).toBe('some error')
})

test('correct status should be set', () => {
  const endState = appReducer(startState, setAppStatus('loading'))
  expect(endState.status).toBe('loading')
})