code: function (needle, haystack,
                             message) {
  
          YUITest.Assert._increment();
  
          if (this._indexOf(haystack, needle) == -1){
              YUITest.Assert.fail(YUITest.Assert._formatMessage(message, "Value " + needle + " (" + (typeof needle) + ") not found in array [" + haystack + "]."));
          }
      }
docs: Asserts that a value is present in an array. This uses the triple equals
  sign so no type cohersion may occur.
  @param {Object} needle The value that is expected in the array.
  @param {Array} haystack An array of values.
  @param {String} message (Optional) The message to display if the assertion fails.
  @method contains
  @static