code: function (parentNode, testCase){
  
                  //add the test suite
                  var node = parentNode.appendChild(testCase),
                      prop,
                      testName;
  
                  //iterate over the items in the test case
                  for (prop in testCase){
                      if ((prop.indexOf("test") === 0 || prop.indexOf(" ") > -1) && typeof testCase[prop] == "function"){
                          node.appendChild(prop);
                      }
                  }
  
              }
docs: ------------------------------------------------------------------------- Test Tree-Related Methods ------------------------------------------------------------------------- 
  Adds a test case to the test tree as a child of the specified node.
  @param {TestNode} parentNode The node to add the test case to as a child.
  @param {YUITest.TestCase} testCase The test case to add.
  @return {Void}
  @static
  @private
  @method _addTestCaseToTestTree