Add Testing section in README file.

README.md

@@ -150,6 +150,18 @@ Proof that SELinux allows binding only to tcp/udp *21* port.
     Ncat: SHA-1 fingerprint: 6EEC 102E 6666 5F96 CC4F E5FA A1BE 4A5E 6C76 B6DC
     Ncat: bind to :::80: Permission denied. QUITTING.
 
+## Testing
+
+Udica repository contains units tests for basic functionality of the tool. Udica should be installed on the system (see [Installing](#Installing)).
+
+To run tests follow these commands:
+
+    # cd tests
+    # python3 -m unittest
+
+The tests are intended to be run on Fedora machine as root. Tested on
+Fedora 29 and Fedora Rawhide.
+
 ## Known issues
 
    * It's not possible to detect capabilities used by container in docker engine, therefore you *have to* use '-c' to specify capabilities for docker container manually.