We'll want these tests to pass so we know a Python3 port doesn't break this part of Scap, at least.
scap/tasks.py has update_l10n_cdb function, which reads JSON files and writes CDB files. I think we need to do the following:
- extract the actual JSON-to-CDB logic into its own function, without the caching logic
- find a set of representative JSON files
- write a test helper using the new function to convert JSON to CDB
- run the helper with both Python2 and Python3 and check the output is bitwise identical