@glidejs/glide/tests/unit/log.test.js

Glide.js is a dependency-free JavaScript ES6 slider and carousel. It’s lightweight, flexible and fast. Designed to slide. No less, no more

import { warn } from '../../src/utils/log'

describe('Warn should', () => {
  test('log an error to the console with suffix', () => {
    let fn = jest.fn()
    let msg = 'Message content'

    global.console = { error: fn }

    warn(msg)

    expect(fn).toHaveBeenCalledWith(`[Glide warn]: ${msg}`)
  })
})