tests: gprs_ns2: add unitdata unit test

test sending unitdata over a alive and blocked NSVC.

Change-Id: I2c44b711d004d2ca08e05d4f54519ad8dbd77c27
diff --git a/tests/gb/gprs_ns2_test.ok b/tests/gb/gprs_ns2_test.ok
index 27c72fa..7d12325 100644
--- a/tests/gb/gprs_ns2_test.ok
+++ b/tests/gb/gprs_ns2_test.ok
@@ -11,5 +11,14 @@
 ---- Create NSVC[i]
 ---- Create NSVC[i]
 --- Finish NSE block unblock nsvc
+--- Testing unitdata test
+---- Create NSE + Binds
+---- Create NSVC[0]
+---- Create NSVC[1]
+---- Send UNITDATA to NSVC[0]
+---- Send Block NSVC[0]
+---- Try to receive over blocked NSVC[0]
+---- Receive over NSVC[1]
+--- Finish unitdata test
 ===== NS2 protocol test END