public void GetDateOfBirthTest()
        {
            DateTime expected = new DateTime(1988, 4, 16, 0, 0, 0);
            DateTime?result   = PersonalCodeUtils.GetDateOfBirth("38804161728");

            Assert.True(expected.Equals(result));
        }
 public void IsValidTest()
 {
     Assert.False(PersonalCodeUtils.IsValid("38804161729"));
     Assert.True(PersonalCodeUtils.IsValid("38804161728"));
 }