Managed to do it thanks for your help!

Ok thank you :)

I have now used a try catch to find the input string and I have my solution working in VS.
Would it help if I messgae you my code?
Thanks for your help.

I am pretty sure the test inputs a zero length string, i tested it like this.

if (strng == "")
return "5";

Test1
Expected string length 0 but was 1. Strings differ at index 0.
Expected:
But was: "5"
-----------^

But when i return what i expect it is expecting, this happens.

if (strng == "")
return "";

Test1
System.OverflowException : Value was either too large or too small for an Int32.
at System.Number.ParseInt32 (System.String s, NumberStyles style, System.Globalization.NumberFormatInfo info) [0x00000] in :0
at System.Int32.Parse (System.String s, IFormatProvider provider) [0x00000] in :0
at System.Convert.ToInt32 (System.String value) [0x00000] in :0
at WeightSort.orderWeight (System.String strng) [0x00000] in :0
at WeightSortTests.Test1 () [0x00000] in :0

The 50 random tests all pass fine.

C#

I get an error if i:

return "";

the test say the expected result is

expected:

so I am a bit confussed as to what it wants...