Issue #3187: Better support for "undecodable" filenames.  Code by Victor
Stinner, with small tweaks by GvR.
diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 59f8c41..45decb7 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -29,7 +29,7 @@
     def testNoArgFunctions(self):
         # test posix functions which take no arguments and have
         # no side-effects which we need to cleanup (e.g., fork, wait, abort)
-        NO_ARG_FUNCTIONS = [ "ctermid", "getcwd", "getcwdu", "uname",
+        NO_ARG_FUNCTIONS = [ "ctermid", "getcwd", "getcwdb", "uname",
                              "times", "getloadavg",
                              "getegid", "geteuid", "getgid", "getgroups",
                              "getpid", "getpgrp", "getppid", "getuid",