Testing Unitario y de integración

Herramientas

Jest

Sintaxis BDD

  describe('module', () => {
    it('test case', () => {
      /* ... */`
      
    })
  })

Métodos 'ciclo de vida'

  beforeEach()
  afterEach()

  beforeAll()
  afterAll()

Aserciones básica

  expect(value)

    .not
    .toBe(value)
    .toBeInstanceOf(Class)
    .toBeTruthy()
    .toEqual(value)
    .toHaveProperty(keyPath, value)
    .toMatch(regexOrString)
    .toMatchObject(object)
    .toThrow(error)
    .toThrowErrorMatchingSnapshot()

Mocks

  const fn = jest.fn()
  const fn = jest.fn(() => 'hello')

  expect(fn)
    .toHaveBeenCalled()
    .toHaveBeenCalledTimes(number)
    .toHaveBeenCalledWith(arg1, arg2, ...)

Jest cheatsheetDevhints.io cheatsheets

@testing-library/react

Métodos de renderizado

  render()
  renderHook()
  act()

API | Testing Library

@testing-library/jest-dom

métodos de búsqueda

getBy()
findBy()
queryBy()
getAllBy()
findAllBy()
queryAllBy()

Cheatsheet | Testing Library