sys.getdefaultencoding() can return None.

diff --git a/Lib/test/test_imp.py b/Lib/test/test_imp.py
index 3110ea9880a02110fe7dcbf11c07179830ebc4cb..627e42f950409c4c0f69635e6fb29b59823649e0 100644 (file)
--- a/Lib/test/test_imp.py
+++ b/Lib/test/test_imp.py
@@ -86,6 +86,7 @@ class ImportTests(unittest.TestCase):
 
         # the return encoding can be uppercase
         fs_encoding = sys.getfilesystemencoding().lower()
+        fs_encoding = fs_encoding.lower() if fs_encoding else 'ascii'
 
         # covers utf-8 and Windows ANSI code pages
         # one non-space symbol from every page