TST: correctly predict locale setability

Don't join the lang and encoding when performing the trial set, because locale.setlocale(locale.LC_ALL, ('it_CH', 'utf-8')) succeeds, but locale.setlocale(locale.LC_ALL, 'it_CH.utf-8') throws locale.Error.

Author: neirbowj

pandas/tools/tests/test_util.py

@@ -65,7 +65,7 @@ def test_set_locale(self):
  enc = codecs.lookup(enc).name
  new_locale = lang, enc
 
- if not tm._can_set_locale('.'.join(new_locale)):
+ if not tm._can_set_locale(new_locale):
  with tm.assertRaises(locale.Error):
  with tm.set_locale(new_locale):
  pass