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));
        }