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import { pluck } from './pluck.js'
test('happy', () => {  expect(pluck('a')([ { a : 1 }, { a : 2 }, { b : 1 } ])).toEqual([ 1, 2 ])})
test('with undefined', () => {  expect(pluck(undefined)([ { a : 1 }, { a : 2 }, { b : 1 } ])).toEqual([ ])})
test('with number', () => {  const input = [    [ 1, 2 ],    [ 3, 4 ],  ]
  expect(pluck(0, input)).toEqual([ 1, 3 ])})