🧪 Jest

Basic test skeleton Jump to heading

describe('Given a xxx', () => {
  describe('when it is rendered', () => {
    test('it should ', () => {
      // Arrange

      // Act

      // Assert
      expect(true).toBe(true)
    })
  })
})

    

Use Jest globals Jump to heading

import { expect, test } from '@jest/globals'

test('two plus two is four', () => {
  expect(2 + 2).toBe(4)
})

    

Throw Jump to heading

import { formatDate } from './formatDate'

test('it should throw', () => {
  expect(() => formatDate('197901180')).toThrow(
    'Date string wrong format/length'
  )
  expect(() => formatDate('abcdefgh')).toThrow(
    'Date string must be only digits'
  )
})