public void Given991781544_ReturnEmptyString()
{
var completeOrgNum = @"991781544";
var orgNumWithouthChecksum = completeOrgNum.Substring(0, completeOrgNum.Length - 1);
var generator = new ChecksumGenerator();
var checksum = generator.GenerateChecksum(orgNumWithouthChecksum);
var result = generator.ValidateChecksum(completeOrgNum, checksum);
result.Should().Be("");
}
