unicode_literals break pytest_addoption hook

[pytestbot]

Originally reported by: Floris Bruynooghe (BitBucket: flub, GitHub: flub)

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When using unicode literals to add options in pytest_addoption argparse fails:

from __future__ import unicode_literals

def pytest_addoption(parser):
    parser.addoption('--foo', action='store', type='string', help='do foo')

Results in:

$ py.test
Traceback (most recent call last):
  File "/home/flub/.local/bin/py.test", line 9, in <module>
    load_entry_point('pytest==2.4.0', 'console_scripts', 'py.test')()
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/config.py", line 18, in main
    config = _prepareconfig(args, plugins)
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/config.py", line 63, in _prepareconfig
    pluginmanager=pluginmanager, args=args)
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/core.py", line 364, in __call__
    return self._docall(methods, kwargs)
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/core.py", line 375, in _docall
    res = mc.execute()
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/core.py", line 293, in execute
    res = method(**kwargs)
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/helpconfig.py", line 25, in pytest_cmdline_parse
    config = __multicall__.execute()
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/core.py", line 293, in execute
    res = method(**kwargs)
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/config.py", line 618, in pytest_cmdline_parse
    self.parse(args)
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/config.py", line 715, in parse
    args = self._parser.parse_setoption(args, self.option)
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/config.py", line 167, in parse_setoption
    parsedoption = self.parse(args)
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/config.py", line 145, in parse
    self.optparser = self._getparser()
  File "/home/flub/.local/lib/python2.7/site-packages/_pytest/config.py", line 160, in _getparser
    arggroup.add_argument(*n, **a)
  File "/usr/lib/python2.7/argparse.py", line 1286, in add_argument
    raise ValueError('%r is not callable' % (type_func,))
ValueError: u'string' is not callable

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/360

[pytestbot]

Original comment by Floris Bruynooghe (BitBucket: flub, GitHub: flub):

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Allow unicode strings in parser.add_argument()

This fixes issue360 by also converting unicode strings to the argparse
syntax instead of just native strings.