doc(dev): add note about local testing

How to exclude the primary tests that are likely to fail when
running tests locally.

diff --git a/README.rst b/README.rst
index b35643e006f04fcb84c0c8f55330c0483bacdc90..21bcffc5f97f5a289218e8055f6d7f30d689152a 100644 (file)
--- a/README.rst
+++ b/README.rst
@@ -88,6 +88,12 @@ Now hack away! You can run the tests using::
     export PSYCOPG_TEST_DSN="dbname=psycopg_test"
     pytest
 
+If some of the tests fail on your local host, it may be helpful to exclude the
+`proxy`, `subprocess`, and/or `timing` tests to get a clean test run, for
+example::
+
+     pytest  -m 'not proxy and not timing'
+
 The project includes some `pre-commit`__ hooks to check that the code is valid
 according to the project coding convention. Please make sure to install them
 by running::