text: exports.randomInts = [1, 9, 2, 8, 3, 7, 4, 6, 5];
  
  exports.orderedInts = [1, 2, 3, 4, 5, 6, 7, 8, 9];
  
  exports.isEven = function (x) {
      return x % 2 === 0;
  };
  
  exports.spy = function (object, method) {
      var func = object[method];
  
      function spy() {
          ++spy.calls;
          return func.apply(object, arguments);
      }
  
      spy.calls = 0;
      object[method] = spy;
      return spy;
  };
  