kajonggtest: make sure we have a UTF-8 default encoding

src/kajonggtest.py

@@ -31,6 +31,7 @@ import time
 import gc
 
 from optparse import OptionParser
+from locale import getdefaultlocale
 
 from common import Debug, StrMixin, cacheDir
 from util import removeIfExists, gitHead, checkMemory
@@ -721,6 +722,11 @@ def main():
     """parse options, play, evaluate results"""
     global OPTIONS  # pylint: disable=global-statement
 
+    locale_encoding = getdefaultlocale()[1]
+    if locale_encoding != 'UTF-8':
+        print('we need default encoding UTF-8 but have {}'.format(locale_encoding))
+        sys.exit(2)
+
     # we want only english in the logs because i18n and friends
     # behave differently in kde and kde
     os.environ['LANG'] = 'en_US.UTF-8'