Added readme instructions and changed test user to postgres.

DEVELOP.rst

@@ -122,3 +122,33 @@ The rpm package can be installed as follows:
 ::
 
     $ sudo yum install pgcli*.rpm
+
+Running the integration tests
+-----------------------------
+
+Integration tests use `behave package http://pythonhosted.org/behave/`_.
+Configuration settings for this package are provided via ``behave.ini`` file
+in root directory.
+
+The database user ``pg_test_user`` has to have permissions to create and drop
+test database. Dafault user is ``postgres`` at ``localhost``, without the
+password (authentication mode ****).
+
+First, install the requirements for testing:
+
+::
+
+    $ pip install -r requirements-dev.txt
+
+After that, tests can be run with:
+
+::
+
+    $ behave
+
+To see stdout/stderr, use the following command:
+
+::
+
+    $ behave --no-capture
+

behave.ini

@@ -1,5 +1,5 @@
 [behave.userdata]
-pg_test_user = behave_user
+pg_test_user = postgres
 pg_test_pass =
 pg_test_host = localhost
 pg_test_db = pgcli_behave_tests