Running script with argument seems to cause RecursionError - python-3.x

Question

I'm working on a little project with unittest.
I can run my tests but if I add an argument to my command line entry (e.g : ./myprogramm.py test instead of just ./myprogramm.py) in order to add an argparse layer (argparse itself doesn't seem to be the cause of the problem) a RecursionError occurs.
Sample file to reproduce :
#!/usr/bin/env python3
import argparse
import unittest
def foo():
return True
class FooTestCase(unittest.TestCase):
def test_foo(self):
self.assertTrue(foo())
def test():
unittest.main()
def main():
foo()
def make_parser():
parser = argparse.ArgumentParser(description='test or foo.')
subparsers = parser.add_subparsers(dest='subcommand')
subparsers.required = True
subparsers.add_parser('test')
subparsers.add_parser('foo')
return parser
if __name__ == '__main__':
parser = make_parser()
args = parser.parse_args()
if args.subcommand == 'test':
test()
elif args.subcommand == 'foo':
main()
Launching this programm with ./myprogramm.py foo works, but not if I launch it with ./myprogramm.py test.
Output with RecursionError :
File "./myprogramm.py", line 14, in test
unittest.main()
File "/usr/lib/python3.5/unittest/main.py", line 93, in __init__
self.parseArgs(argv)
File "/usr/lib/python3.5/unittest/main.py", line 140, in parseArgs
self.createTests()
File "/usr/lib/python3.5/unittest/main.py", line 147, in createTests
self.module)
File "/usr/lib/python3.5/unittest/loader.py", line 219, in loadTestsFromNames
suites = [self.loadTestsFromName(name, module) for name in names]
File "/usr/lib/python3.5/unittest/loader.py", line 219, in <listcomp>
suites = [self.loadTestsFromName(name, module) for name in names]
File "/usr/lib/python3.5/unittest/loader.py", line 204, in loadTestsFromName
test = obj()
File "./myprogramm.py", line 14, in test
unittest.main()
File "/usr/lib/python3.5/unittest/main.py", line 93, in __init__
self.parseArgs(argv)
File "/usr/lib/python3.5/unittest/main.py", line 114, in parseArgs
self._initArgParsers()
File "/usr/lib/python3.5/unittest/main.py", line 150, in _initArgParsers
parent_parser = self._getParentArgParser()
File "/usr/lib/python3.5/unittest/main.py", line 155, in _getParentArgParser
parser = argparse.ArgumentParser(add_help=False)
File "/usr/lib/python3.5/argparse.py", line 1629, in __init__
self._positionals = add_group(_('positional arguments'))
File "/usr/lib/python3.5/gettext.py", line 514, in gettext
return dgettext(_current_domain, message)
File "/usr/lib/python3.5/gettext.py", line 478, in dgettext
codeset=_localecodesets.get(domain))
File "/usr/lib/python3.5/gettext.py", line 413, in translation
mofiles = find(domain, localedir, languages, all=True)
File "/usr/lib/python3.5/gettext.py", line 376, in find
val = os.environ.get(envar)
File "/usr/lib/python3.5/_collections_abc.py", line 595, in get
return self[key]
RecursionError: maximum recursion depth exceeded
How could I (should I?) handle this?
Thus far to avoid this problem, I run del sys.argv[1]. But is there a better way?
I guess that unittest.main() uses sys.argv and test as first argument triggers a particular behaviour for this function.
If I use an other keyword that test I get something like this (using bar here) :
E
======================================================================
ERROR: bar (unittest.loader._FailedTest)
----------------------------------------------------------------------
AttributeError: module '__main__' has no attribute 'bar'
----------------------------------------------------------------------
Ran 1 test in 0.000s
FAILED (errors=1)