Fahrenheit and Celcius temperature conversions

temps.js

function celsToFahr(celsTemp) {
  return celsTemp * 9/5 + 32;
}

function fahrToCels(fahrTemp) {
  return (fahrTemp - 32) * 5/9;
}

/* From here down, you are not expected to 
   understand.... for now :)  
   
   
   Nothing to see here!
   
*/

// tests

function testConversion(fn, input, expected) {
  if (fn(input) === expected) {
    console.log('SUCCESS: `' + fn.name + '` is working');
    return true;
  } else {
    console.log('FAILURE: `' + fn.name + '` is not working');