JavaScript shuffle visualizer

/************ CoffeeScript source: ************
deckSize = 52
deck = [0...deckSize]

rand = (min = 0, max = 51) ->
  Math.floor(Math.random() * (max - min + 1)) + min

swap = (a, b) ->
  [deck[a], deck[b]] = [deck[b], deck[a]]

testCount = 52
test = (deck) ->
    document.write '<table>'
    for [1..testCount]
        do shuffle
        for i in [0...deckSize]
            if deck.indexOf(i) is -1 then throw "#{i} is not in the deck"
            if deck.length isnt 52 then throw "deck length is #{deck.length}; should be 52"
        plot deck
    document.write '</table>'

plot = (deck) ->
    document.write '<tr>'
    for i in [0...deck.length]
        bg = 5 * deck[i] % 256
        document.write """
            <td style='background-color:rgb(#{bg},#{bg},#{bg});height:20px;width:20px'>
                &nbsp;
            </td>"""
    document.write '</tr>'
*********************************************/
//Usage:
//1. Declare your shuffle() function
//2. Run `test(deck)`

var deck, deckSize, plot, rand, swap, test, testCount, _i, _results;

deckSize = 52;

deck = (function() {
  _results = [];
  for (var _i = 0; 0 <= deckSize ? _i < deckSize : _i > deckSize; 0 <= deckSize ? _i++ : _i--){ _results.push(_i); }
  return _results;
}).apply(this);

rand = function(min, max) {
  if (min == null) min = 0;
  if (max == null) max = 51;
  return Math.floor(Math.random() * (max - min + 1)) + min;
};

swap = function(a, b) {
  var _ref;
  return _ref = [deck[b], deck[a]], deck[a] = _ref[0], deck[b] = _ref[1], _ref;
};

testCount = 52;

test = function(deck) {
  var i, _j, _k;
  document.write('<table>');
  for (_j = 1; 1 <= testCount ? _j <= testCount : _j >= testCount; 1 <= testCount ? _j++ : _j--) {
    shuffle();
    for (i = _k = 0; 0 <= deckSize ? _k < deckSize : _k > deckSize; i = 0 <= deckSize ? ++_k : --_k) {
      if (deck.indexOf(i) === -1) throw "" + i + " is not in the deck";
      if (deck.length !== 52) {
        throw "deck length is " + deck.length + "; should be 52";
      }
    }
    plot(deck);
  }
  return document.write('</table>');
};

plot = function(deck) {
  var bg, i, _j, _ref;
  document.write('<tr>');
  for (i = _j = 0, _ref = deck.length; 0 <= _ref ? _j < _ref : _j > _ref; i = 0 <= _ref ? ++_j : --_j) {
    bg = 5 * deck[i] % 256;
    document.write("<td style='background-color:rgb(" + bg + "," + bg + "," + bg + ");height:20px;width:20px'>\n    &nbsp;\n</td>");
  }
  return document.write('</tr>');
};