diff -r 3a57eafd8401 Lib/cgi.py
--- a/Lib/cgi.py	Tue May 24 09:15:14 2016 +0300
+++ b/Lib/cgi.py	Tue May 24 22:02:54 2016 +0200
@@ -45,7 +45,7 @@
 
 __all__ = ["MiniFieldStorage", "FieldStorage",
            "parse", "parse_qs", "parse_qsl", "parse_multipart",
-           "parse_header", "print_exception", "print_environ",
+           "parse_header", "test", "print_exception", "print_environ",
            "print_form", "print_directory", "print_arguments",
            "print_environ_usage", "escape"]
 
diff -r 3a57eafd8401 Lib/test/test_cgi.py
--- a/Lib/test/test_cgi.py	Tue May 24 09:15:14 2016 +0300
+++ b/Lib/test/test_cgi.py	Tue May 24 22:02:54 2016 +0200
@@ -7,6 +7,7 @@
 import warnings
 from collections import namedtuple
 from io import StringIO, BytesIO
+from test import support
 
 class HackedSysModule:
     # The regression test will have real values in sys.argv, which
@@ -529,5 +530,13 @@
 --AaB03x--
 """
 
+
+class MiscTestCase(unittest.TestCase):
+    def test__all__(self):
+        blacklist = {"logfile", "logfp", "initlog", "dolog", "nolog",
+                     "closelog", "log", "maxlen", "valid_boundary"}
+        support.check__all__(self, cgi, blacklist=blacklist)
+
+
 if __name__ == '__main__':
     unittest.main()