jest-mock-warn

mock console.warn

Installation

yarn add -D jest-mock-warn

Usage

import { mockWarn } from 'jest-mock-warn'

function myFunction() {
  if (!arguments.length) console.warn('provide an argument')
}

describe('my tests', () => {
  mockWarn()
  it('warns when called without arguments', () => {
    myFunction()
    expect('provide an argument').toHaveBeenWarned()
    expect('provide an argument').toHaveBeenWarnedTimes(1)
    expect('provide an argument').toHaveBeenLastWarned()
  })
})

API

• toHaveBeenWarned()
• toHaveBeenWarnedLast()
• toHaveBeenWarnedTimes(n: number)

License

MIT