Add reference to STC tests in UP4 repo

Change-Id: I72dc7ea594d7b06d46e6fdea2a8ea23319780b79
diff --git a/testing/component.rst b/testing/component.rst
index 38673a0..b511dad 100644
--- a/testing/component.rst
+++ b/testing/component.rst
@@ -1,2 +1,6 @@
 Component Tests (STC)
 =====================
+
+Integration tests for P4-UPF use the ONOS System Test Coordinator (STC) framework.
+The documentation about tests can be found in the UP4 Repository:
+`Integration Tests Scenarios <https://github.com/omec-project/up4/blob/master/scenarios/docs/README.md>`_.