function shouter(whatToShout) {
  return whatToShout.toUpperCase() + "!!!";
}

console.log(shouter("fee figh foe fum"));

function testShouter() {
  const whatToShout = 'fee figh foe fum';
  const expected = 'FEE FIGH FOE FUM!!!';
  if (shouter(whatToShout) === expected) {
    console.log('SUCCESS: `shouter` is working');
  } else {
    console.log('FAILURE: `shouter` is not working');
  }
}

testShouter();