public void Normal_SumBigNumbersTests()
{
//arrange
string result = SumBigNumbers.Add("100000000000000000000000000000000000000000000000000000000000000000000000011", "100000000000000000000000000000000000000000000000000000000000000000000000011");
//act
string expected = "200000000000000000000000000000000000000000000000000000000000000000000000022";
//assert
Assert.IsTrue(result == expected);
}
public void NullValue_SumBigNumbersTests(string a, string b)
{
//assert
Assert.ThrowsException <ArgumentOutOfRangeException>(() => SumBigNumbers.Add(a, b));
}