public void FindAssignedEditPositionInRange()
{
var maskedTextProvider = new MaskedTextProvider(TestSimpleDigitMask);
Assert.Equal(-1, maskedTextProvider.FindAssignedEditPositionInRange(0, 1, true));
maskedTextProvider.Add("12");
Assert.Equal(0, maskedTextProvider.FindAssignedEditPositionInRange(0, 1, true));
Assert.Equal(2, maskedTextProvider.FindAssignedEditPositionInRange(0, 5, false));
}