public void InputOutputMappingViewModel_DefaultWithEmptyToNull_Expect_EmptyToNullString()
{
const string name = "vehicleColor";
const string value = "vehicleColor";
const string mapsTo = "testMapsTo";
string defaultValue = string.Empty;
const string recordSetName = "testRecSetName";
const bool required = true;
_inputOutputViewModel = new InputOutputViewModel(name, value, mapsTo, defaultValue, required, recordSetName, true);
string actual = _inputOutputViewModel.DisplayDefaultValue;
Assert.AreEqual("Empty to NULL", actual);
}