public void Should_Return_Sum_Of_Arguments()
{
StringSumUtility ssu = new StringSumUtility();
var result = ssu.Sum("1", "2");
result.Should().Be("3");
}
public void Should_Return_Zero_If_Both_Nums_Not_Natural()
{
StringSumUtility ssu = new StringSumUtility();
var result = ssu.Sum("asd", "asd");
result.Should().Be("0");
}
public void Should_Return_One_Argument_If_Another_Is_Not_Natural()
{
StringSumUtility ssu = new StringSumUtility();
var result = ssu.Sum("asd", "13");
result.Should().Be("13");
}
public void Should_Throw_ArgumentException_If_Argument_Is_Whitespace()
{
StringSumUtility ssu = new StringSumUtility();
Action action = () => ssu.Sum(" ", "1");
action.Should().ThrowExactly <ArgumentException>();
}
