public void ShouldDecodeBase64String()
        {
            const string Base64EncodedData = "SGVsbG8gQmFzZTY0";
             const string DecodedData = "Hello Base64";

             var base64Converter = new Base64Converter();
             string result = base64Converter.Decode(Base64EncodedData);

             Assert.That(DecodedData, Is.EqualTo(result));
        }
 public void ShouldReturnNullWhenNullIsGivenToDecode()
 {
     var base64Converter = new Base64Converter();
      string result = base64Converter.Decode(null);
      Assert.That(result, Is.EqualTo(null));
 }