000"],
    "a valid time string representing 1 second before noon");
} , "stepDown on step value second ");

test(function(){
  _StepTest.value = "12:00";
  _StepTest.step = "0.001";
  _StepTest.stepUp();
  assert_equals(_StepTest.value, "12:00:00.001");
} , "stepUp on step value with fractional seconds");
test(function(){
  _StepTest.value = "12:00";
  _StepTest.step = "0.001";
  _StepTest.stepDown();
  assert_equals(_StepTest.value, "11:59:59.999");
} , "stepDown on step value with fractional seconds");

