Testing lettering sample code

gistfile1.txt

;(function ($) {
  function Lettering() {}
  
  Lettering.prototype.splitText = function() {};

  Lettering.prototype.injector = function() {};

  window.LetteringJS = Lettering;
})(jQuery);

Then you can test with

var letter = new Lettering();
// where test is your testing tool
test.is(letter.splitText("My test string"), ["M", "y", " "…]);