JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/jasmine/2.0.0/jasmine.js"></script>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/jasmine/2.0.0/jasmine.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/jasmine/2.0.0/jasmine-html.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jasmine/2.0.0/boot.js"></script>
<script src="https://rawgit.com/gampleman/quick_check.js/master/dist/quick-check.js"></script>

JavaScript

function sort(list) {
  for (var j = 1; j < list.length; j++) {
    var key = list[j],
        i = j - 1;
    while (i >= 0 && list[i] > key) {
      list[i + 1] = list[i];
      i--;
    }
    list[i + 1] = key;
  }
  return list;
}

describe('sort', function() {
  it('sorted lists have the same length as originals', function() {
    expect(function(list) { 
        var orig = list.slice();
        sort(list);
        return orig.length === list.length; 
    }).forAll(qc.arrayOf(qc.int));
  });
  
});