Changes in anticipation of stricter str vs. bytes enforcement.
diff --git a/Lib/test/test_cgi.py b/Lib/test/test_cgi.py
index 652b36e..9b3df21 100644
--- a/Lib/test/test_cgi.py
+++ b/Lib/test/test_cgi.py
@@ -232,7 +232,7 @@
                 return a
 
         f = TestReadlineFile(tempfile.TemporaryFile())
-        f.write('x' * 256 * 1024)
+        f.write(b'x' * 256 * 1024)
         f.seek(0)
         env = {'REQUEST_METHOD':'PUT'}
         fs = cgi.FieldStorage(fp=f, environ=env)