function vowels(str) {

  const matchs = str.match(/[aeiou]/gi);

  return matchs ? matchs.length : 0;

}

module.exports = vowels;

const vowels = require('./index');

test('Vowels is a function', () => {

  expect(typeof vowels).toEqual('function');

});

test('returns the number of vowels used', () => {

  expect(vowels('aeiou')).toEqual(5);

});

test('returns the number of vowels used when they are capitalized', () => {

  expect(vowels('AEIOU')).toEqual(5);

});

test('returns the number of vowels used', () => {

  expect(vowels('abcdefghijklmnopqrstuvwxyz')).toEqual(5);

});

test('returns the number of vowels used', () => {

  expect(vowels('bcdfghjkl')).toEqual(0);

});