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import { tail } from './tail.js'
test('tail', () => {  expect(tail([ 1, 2, 3 ])).toEqual([ 2, 3 ])  expect(tail([ 1, 2 ])).toEqual([ 2 ])  expect(tail([ 1 ])).toEqual([])  expect(tail([])).toEqual([])
  expect(tail('abc')).toBe('bc')  expect(tail('ab')).toBe('b')  expect(tail('a')).toBe('')  expect(tail('')).toBe('')})