@unpack, @file_data, and JSON list of lists

[interrogator]

Hi,

Great project, you've really improved our testing framework, thanks.

I appear to have found some unexpected behaviour when combining @file_data and @unpack when the JSON file contains a list of lists of strings.

Say I have j.json:

[ 
  ["some", "data"],
  ["another", "point"]
]

and example.py:

import unittest
from ddt import ddt, file_data, unpack

@ddt
class Tests(unittest.TestCase):

    @file_data('j.json')
    @unpack
    def test(self, first, second):
        return

unittest.main()

and run python example.py, I get an unexpected error:

Traceback (most recent call last):
  File "/.../py3/lib/python3.6/site-packages/ddt.py", line 139, in wrapper
    return func(self, *args, **kwargs)
TypeError: test() missing 1 required positional argument: 'second'

I would expect second to be "data" for the first generated test, then "point" for the second, but in fact, first contains a list, ["some", "data"], meaning that it wasn't unpacked . Is this behaviour a bug or feature? If bug, should I try to fix and PR?

Should point out: I know I could use dict/map structures in the JSON, but for our cases this is not desirable.

[wswld]

Hi, sorry for the delay. Is this still relevant to you?

[interrogator]

Hi, yeah, I believe it would still be handy if it was fixed. Not a huge priority though, we have a workaround right now