public void IsValidCalledTwice_ForValidValues_ReturnsTrue()
 {
     var sut = new NipNumberValidatorAttribute();
     Assert.IsFalse(sut.IsValid("7680002462"));
     Assert.IsTrue(sut.IsValid("7680002466"));
 }
 public void IsValid_ForValidValues_ReturnsFalse(object value)
 {
     var sut = new NipNumberValidatorAttribute();
     Assert.IsFalse(sut.IsValid(value));
 }