Allow skipping the slow testmanylinux

It's not so much about tests being slow: some just get stuck and timeout
travis.

Skipped all tests taking about more than 0.2s to run on my laptop.
Fast testing takes about 8s instead of 24.

1 files changed, 2 insertions, 1 deletions

diff --git a/tests/test_async.py b/tests/test_async.py
index 6f8fed5..b379bae 100755
--- a/tests/test_async.py
+++ b/tests/test_async.py
@@ -23,7 +23,7 @@
 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 # License for more details.
 
-from testutils import unittest, skip_before_postgres
+from testutils import unittest, skip_before_postgres, slow
 
 import psycopg2
 from psycopg2 import extensions
@@ -318,6 +318,7 @@ class AsyncTests(ConnectingTestCase):
         self.assert_(conn.async)
         conn.close()
 
+    @slow
     def test_flush_on_write(self):
         # a very large query requires a flush loop to be sent to the backend
         curs = self.conn.cursor()