value,
    [
      "11:59",
      "11:59:00",
      "11:59:00.0",
      "11:59:00.00",
      "11:59:00.000"],
    "a valid time string representing 1 minute before noon");
} , "stepDown on step value zero ");

test(function(){
  _StepTest.value = "00:00";
  _StepTest.step = "86399";
  _StepTest.stepUp();
  assert_in_array(
    _StepTest.value,
    [
      "23:59:59",
      "23:59:59.0",
      "23:59:59.00",
      "23:59:59.000"],
    "a valid time string representing 1 second before midnight");
} , "stepUp 