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Jest - basico

Jest - básico

QuestionAnswer
Qual comando roda os testes? npx jest
Como definir um teste? test() ou it()
Exemplo de test? test('descrição', () => {})
O que é expect()? Função de asserção.
O que é matcher? Funções usadas com expect.
Exemplo de matcher? toBe()
O que toBe() faz? Compara valores primitivos.
Qual matcher compara objetos? toEqual()
Como testar igualdade? expect(a).toBe(b)
Como testar objetos? expect(obj).toEqual(obj2)
O que é describe()? Agrupa testes.
Exemplo de describe? describe('grupo', () => {})
Diferença entre test e it? Nenhuma prática.
Como rodar apenas um teste? test.only()
Como ignorar teste? test.skip()
Arquivos de teste padrão? .test.js ou .spec.js
O que é snapshot? Comparação automática de saída.
Criar snapshot? toMatchSnapshot()
Atualizar snapshot? jest -u
O que é beforeEach()? Executa antes de cada teste.
O que é afterEach()? Executa uma vez antes.
O que é beforeAll()? Executa uma vez depois.
Como testar boolean? toBe(true/false)
Como testar null? toBeNull()
Como testar número maior? toBeGreaterThan()
Como testar número menor? toBeLessThan()
Testar string? toMatch()
Testar array contém valor? toContain()
Testar erro lançado? toThrow()
Exemplo de erro? expect(fn).toThrow()
O que é coverage? Cobertura de testes.
Como gerar coverage? jest --coverage
O que é CLI? Interface de linha de comando.
Onde configurar Jest? Package.json ou jest.config.js
Como testar undefined? toBeUndefined()
O que é test.concurrent? Executa testes paralelos.
O que é fail()? Força falha no teste.
Created by: claudiobitar
 

 



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