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jest - intermediário

QuestionAnswer
O que é mock? Simulação de função.
Criar mock? jest.fn()
O que jest.fn() faz? Cria função fake.
Como verificar chamadas? toHaveBeenCalled()
Ver quantas vezes chamou? toHaveBeenCalledTimes()
Ver argumentos? toHaveBeenCalledWith()
O que é spy? Observa função real.
Criar spy? jest.spyOn()
Restaurar spy? mockRestore()
Mock retorno? mockReturnValue()
Mock retorno async? mockResolvedValue()
Mock rejeição? mockRejectedValue()
Mock implementação? mockImplementation()
Resetar mocks? jest.resetAllMocks()
Limpar mocks? jest.clearAllMocks()
Diferença reset vs clear? Reset remove implementação.
Mock módulo? jest.mock()
Mock parcial? jest.requireActual()
O que é automock? Mock automático de módulos.
O que é fake timers? Controle de tempo.
Ativar fake timers? jest.useFakeTimers()
Avançar tempo? jest.advanceTimersByTime()
Rodar timers? jest.runAllTimers()
Testar async? async/await
Testar promise? return promise
Matcher async? resolves/rejects
Exemplo resolves? expect(p).resolves.toBe()
Exemplo rejects? expect(p).rejects.toThrow()
O que é done()? Callback para async antigo.
Quando usar done? Em callbacks.
O que é setupFiles? Arquivos antes dos testes.
O que é setupFilesAfterEnv? Setup após ambiente.
O que é testEnvironment? Define ambiente.
Exemplo ambiente DOM? jsdom
O que é jsdom? Simulação de browser.
O que é moduleNameMapper? Alias de import.
O que é transform? Transpilar código.
O que é watch mode? Roda testes automaticamente.
Ativar watch? jest --watch
O que é test isolation? Testes independentes.
O que é side effect? Efeito colateral.
Evitar side effects como? Mockando dependências.
Evitar side effects como? Mockando dependências.
O que é dependency injection? Injetar dependências.
Benefício DI nos testes? Facilita mocks.
O que é snapshot drift? Snapshot desatualizado.
Problema de snapshot? Pode mascarar bugs.
O que é coverage threshold? Limite mínimo cobertura.
Configurar threshold? coverageThreshold
Melhor prática Jest? Testes pequenos e claros.
Created by: claudiobitar
 

 



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