การใช้งาน Setup และ Teardown ใน Jest

beforeEach(() => {
  console.log('to do before test')
})

afterEach(() => {
  console.log('to do after test')
})

test('add 1 + 2 to equal 3', () => {
  expect(1 + 2).toEqual(3)
})

test('add 3 + 4 to equal 7', () => {
  expect(3 + 4).toEqual(7)
})

beforeAll(() => {
  console.log('to do before all test')
})

afterAll(() => {
  console.log('to do after all test')
})

test('add 1 + 2 to equal 3', () => {
  expect(1 + 2).toEqual(3)
})

test('add 3 + 4 to equal 7', () => {
  expect(3 + 4).toEqual(7)
})

// Applies to all tests in this file
beforeEach(() => {
  console.log('to do before test')
})

// Test case
test('add 1 + 2 to equal 3', () => {
  expect(1 + 2).toEqual(3)
})

describe('matching cities to foods', () => {
  // Applies only to tests in this describe block
  beforeEach(() => {
    console.log('to do before test in describe')
  })

  // Test case
  test('add 3 + 4 to equal 7', () => {
    expect(3 + 4).toEqual(7)
  })
})

beforeAll(() => console.log('1 - beforeAll'))
afterAll(() => console.log('1 - afterAll'))
beforeEach(() => console.log('1 - beforeEach'))
afterEach(() => console.log('1 - afterEach'))

test('', () => console.log('1 - test'))

describe('Scoped / Nested block', () => {
  beforeAll(() => console.log('2 - beforeAll'))
  afterAll(() => console.log('2 - afterAll'))
  beforeEach(() => console.log('2 - beforeEach'))
  afterEach(() => console.log('2 - afterEach'))

  test('', () => console.log('2 - test'))
})

// Output
// 1 - beforeAll
// 1 - beforeEach
// 1 - test
// 1 - afterEach
// 2 - beforeAll
// 1 - beforeEach
// 2 - beforeEach
// 2 - test
// 2 - afterEach
// 1 - afterEach
// 2 - afterAll
// 1 - afterAll