added tests for setlocale()

tests/test_.py

@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+import pytest
+
+import ioex
+import locale
+import datetime
+
+@pytest.mark.parametrize(('locale_code'), [
+    'unknown_??.utf8',
+    ])
+def test_setlocale_unsupported(locale_code):
+    with pytest.raises(ioex.UnsupportedLocaleSettingError):
+        with ioex.setlocale(locale_code):
+            pass
+
+def test_setlocale_unsupported_inheritance():
+    assert issubclass(ioex.UnsupportedLocaleSettingError, locale.Error)
+
+@pytest.mark.xfail(raises = ioex.UnsupportedLocaleSettingError)
+@pytest.mark.parametrize(('dt', 'dt_format', 'locale_code', 'expected_string'), [
+    [datetime.datetime(2016, 07, 23, 1, 7, 12), '%x', 'de_DE.utf8', u'23.07.2016'],
+    [datetime.datetime(2016, 07, 23, 1, 7, 12), '%X', 'de_DE.utf8', u'01:07:12'],
+    [datetime.datetime(2016, 07, 23, 1, 7, 12), '%x', 'en_US.utf8', u'07/23/2016'],
+    [datetime.datetime(2016, 07, 23, 1, 7, 12), '%X', 'en_US.utf8', u'01:07:12 AM'],
+    [datetime.datetime(2016, 07, 23, 1, 7, 12), '%x', 'it_IT.utf8', u'23/07/2016'],
+    [datetime.datetime(2016, 07, 23, 1, 7, 12), '%X', 'it_IT.utf8', u'01:07:12'],
+    [datetime.datetime(2016, 07, 23, 1, 7, 12), '%x', 'zh_CN.utf8', u'2016年07月23日'],
+    [datetime.datetime(2016, 07, 23, 1, 7, 12), '%X', 'zh_CN.utf8', u'01时07分12秒'],
+    ])
+def test_setlocale_strtime(dt, dt_format, locale_code, expected_string):
+    with ioex.setlocale(locale_code):
+        assert dt.strftime(dt_format).decode('utf-8') == expected_string