Fix suspend/resume tests

Ensure that a suspend/resume was sent before sending the *_(N)ACK. In
reality these can only happen together and our TLLI cache removes
the entries after it sees the corresponding (N)ACK so it will not
forward the second message.

Change-Id: Ie0fd81edb748d3c638e42c4418ca514095c55861
Related: SYS#4865, OS#4472
diff --git a/gbproxy/GBProxy_Tests.ttcn b/gbproxy/GBProxy_Tests.ttcn
index 59154e8..475b647 100644
--- a/gbproxy/GBProxy_Tests.ttcn
+++ b/gbproxy/GBProxy_Tests.ttcn
@@ -1024,6 +1024,12 @@
 
 		f_global_sgsn2pcu(pdu_tx, pdu_rx);
 
+		pdu_tx := ts_BSSGP_SUSPEND(tlli, ra_id);
+		/* we cannot use pdu_tx as there are some subtle differences in the length field :/ */
+		pdu_rx := tr_BSSGP_SUSPEND(tlli, ra_id);
+
+		f_global_pcu2sgsn(pdu_tx, pdu_rx);
+
 		/* These messages are simple passed through so just also test sending NACK */
 		pdu_tx := ts_BSSGP_SUSPEND_NACK(tlli, ra_id, BSSGP_CAUSE_UNKNOWN_MS);
 		/* we cannot use pdu_tx as there are some subtle differences in the length field :/ */
@@ -1060,6 +1066,12 @@
 
 		f_global_sgsn2pcu(pdu_tx, pdu_rx);
 
+		pdu_tx := ts_BSSGP_RESUME(tlli, ra_id, int2oct(i, 1));
+		/* we cannot use pdu_tx as there are some subtle differences in the length field :/ */
+		pdu_rx := tr_BSSGP_RESUME(tlli, ra_id, int2oct(i, 1));
+
+		f_global_pcu2sgsn(pdu_tx, pdu_rx);
+
 		/* These messages are simple passed through so just also test sending NACK */
 		pdu_tx := ts_BSSGP_RESUME_NACK(tlli, ra_id, BSSGP_CAUSE_UNKNOWN_MS);
 		/* we cannot use pdu_tx as there are some subtle differences in the length field :/ */