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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>testing on jsbin</title>
  <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/mocha/1.18.2/mocha.css">
</head>
<body>  
  <div id="mocha"></div>
​
  <script src="//cdnjs.cloudflare.com/ajax/libs/mocha/1.18.2/mocha.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/chai/1.9.0/chai.js"></script>
  <script>
    function isSumOfSquares(n) {
      var maxNumber = Math.sqrt(n);
      for (var i=1; i < maxNumber; i++) {
        for (var j=1; j < maxNumber; j++) {
          if (i*i + j*j === n) return true;
        }
      }
      return false;
    }
    
    mocha.setup('bdd');
    var expect = chai.expect;
    
    describe('sum of squares', function() {
      it('should report that 116 is a sum of squares', function() {
        expect(isSumOfSquares(116)).to.equal(true);
      });
      
      it('should report that 99 is not a sum of squares', function() {
        expect(isSumOfSquares(99)).to.equal(false);
      });
    });
    
    mocha.run();
  </script>
</body>
</html>
 
​
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