public void Given_that_builder_is_null_when_adding_rule_it_should_throw()
{
IIbanNetOptionsBuilder builder = null;
// Act
// ReSharper disable once ExpressionIsAlwaysNull
Action act = () => builder.ValidateNationalCheckDigits();
// Assert
act.Should()
.Throw <ArgumentNullException>()
.Which.ParamName.Should()
.Be(nameof(builder));
}
