Test code lists for GDSN release 3.1.27 are published here.
Code lists are also available in machine-readable format from https://gs1.se/services/codelist/3.1/ followed by the attribute ID, for example https://gs1.se/services/codelist/3.1/T2241.xml
Naming of test code lists is as follows: T1234_(GDSN version).xml. For example: T3777_3127.xml.