[test_utils] Add a basic test for i18n

.travis.yml

@@ -17,3 +17,7 @@ notifications:
 #    channels:
 #      - "irc.freenode.org#youtube-dl"
 #    skip_join: true
+addons:
+  apt:
+    packages:
+      - gettext

Makefile

@@ -36,14 +36,14 @@ install: youtube-dl youtube-dl.1 youtube-dl.bash-completion youtube-dl.zsh youtu
 codetest:
 	flake8 .
 
-test:
+test: update-gmo
 	#nosetests --with-coverage --cover-package=youtube_dl --cover-html --verbose --processes 4 test
 	nosetests --verbose test
 	$(MAKE) codetest
 
 ot: offlinetest
 
-offlinetest: codetest
+offlinetest: codetest update-gmo
 	nosetests --verbose test --exclude test_download.py --exclude test_age_restriction.py --exclude test_subtitles.py --exclude test_write_annotations.py --exclude test_youtube_lists.py
 
 tar: youtube-dl.tar.gz

test/test_utils.py

@@ -30,6 +30,7 @@ from youtube_dl.utils import (
     fix_xml_ampersands,
     InAdvancePagedList,
     intlist_to_bytes,
+    I18N,
     is_html,
     js_to_json,
     limit_length,
@@ -746,6 +747,35 @@ The first line
                 {'nocheckcertificate': False}, '--check-certificate', 'nocheckcertificate', 'false', 'true', '='),
             ['--check-certificate=true'])
 
+    def test_i18n(self):
+        old_locale = os.environ.get('LC_ALL')
+        if old_locale is not None:
+            del os.environ['LC_ALL']
+
+        instance = I18N()
+        instance.set_default_language('en_US')
+        self.assertEqual(instance.translate('Test URL: %s'), 'Test URL: %s')
+
+        instance = I18N()
+        instance.set_default_language('zh_TW')
+        self.assertEqual(instance.translate('Test URL: %s'), '測試網址：%s')
+
+        # A fake language code
+        instance = I18N()
+        instance.set_default_language('pp_QQ')
+        self.assertEqual(instance.translate('Test URL: %s'), 'Test URL: %s')
+
+        # setting locale via environ is not applicable on Windows
+        if not sys.platform.startswith('win'):
+            os.environ['LC_ALL'] = 'zh_TW'
+            instance = I18N()
+            self.assertEqual(instance.translate('Test URL: %s'), '測試網址：%s')
+
+        if old_locale is not None:
+            os.environ['LC_ALL'] = old_locale
+        else:
+            del os.environ['LC_ALL']
+
 
 if __name__ == '__main__':
     unittest.main()