Patch #1680959: add test suite for pipes module.
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index a20ba15..99803ff 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -830,6 +830,7 @@
         test_mhlib
         test_openpty
         test_ossaudiodev
+        test_pipes
         test_poll
         test_posix
         test_pty