Create instructions for running tests

docs/developers/tests.rst

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+.. _how-to-run-the-unit-tests-of-nes:
+
+How to run the unit tests of NES
+=============================================
+In this guide, we will demonstrate how to run the unit tests of NES. 
+
+
+.. Note::
+  * We will assume NES was installed according to the :ref:`tutorial-to-install-the-latest-version-of-nes`.
+  * For demonstration purposes, we assume NES was deployed at ``/usr/local/nes-system``.
+
+
+.. running-tests:
+
+Running the tests
+-----------------
+
+1. In order to execute the tests, the NES user in PostgreSQL must have permission to create databases. Grant permission to create databases for the NES user in PostgreSQL  (change ``nes`` for NES database user name)::
+
+    sudo su postgres -c 'psql'
+
+    alter role nes with createdb;
+
+    quit;
+
+2. Activate virtualenv::
+
+    cd /usr/local/nes-system/
+
+    source bin/activate
+
+Next steps will be executed inside the virtualenv.
+
+3. Change path to::
+
+    cd /usr/local/nes-system/nes/patientregistrationsystem/qdc
+
+4. Run the tests::
+
+    python manage.py test
+