Index: test_argparse.py
===================================================================
--- test_argparse.py	(revision 83926)
+++ test_argparse.py	(working copy)
@@ -12,6 +12,11 @@
 from io import StringIO
 
 from test import support
+
+# if the user set the COLUMNS environment variable to something other than 80
+# then line wrapping will occur at a different column, causing many failures
+os.environ["COLUMNS"] = "80"
+
 class StdIOBuffer(StringIO):
     pass