Add TC_attach_pdp_act_user_deact_mt for GGSN-originated PDP DEACT

Change-Id: I7eb653694f487f8bbf122146300c93be625b0f87
Related: OS#2961
diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index 06ed56b..a853c6d 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -842,6 +842,22 @@
 	}
 }
 
+function f_pdp_ctx_deact_mt(inout PdpActPars apars, OCT1 cause) runs on BSSGP_ConnHdlr {
+	var Gtp1cUnitdata g_ud;
+	var integer seq_nr := 23;
+	var GtpPeer peer := valueof(ts_GtpPeerC(apars.sgsn_ip_c));
+
+	BSSGP.clear;
+	GTP.send(ts_GTPC_DeletePDP(peer, seq_nr, apars.sgsn_tei_c, apars.nsapi, omit));
+
+	interleave {
+	[] BSSGP.receive(tr_BD_L3_MT(tr_SM_DEACT_PDP_REQ_MT(apars.tid, ?))) {
+		BSSGP.send(ts_SM_DEACT_PDP_ACCEPT_MO(apars.tid));
+		}
+	[] GTP.receive(tr_GTPC_MsgType(?, deletePDPContextResponse, apars.ggsn_tei_c)) { }
+	}
+}
+
 
 /* Table 10.5.156/3GPP TS 24.008 */
 template (value) QoSV t_QosDefault := {
@@ -1095,6 +1111,28 @@
 	vc_conn.done;
 }
 
+/* ATTACH + PDP CTX ACT + user plane traffic + PDP CTX DEACT in MT direction */
+private function f_TC_attach_pdp_act_user_deact_mt(charstring id) runs on BSSGP_ConnHdlr {
+	var PdpActPars apars := valueof(t_PdpActPars(mp_ggsn_ip));
+
+	/* first perform regular attach */
+	f_TC_attach(id);
+	/* then activate PDP context */
+	f_pdp_ctx_act(apars);
+	/* then transceive a downlink PDU */
+	f_gtpu_xceive_mt(apars, f_rnd_octstring(100));
+	f_gtpu_xceive_mo(apars, f_rnd_octstring(200));
+
+	f_pdp_ctx_deact_mt(apars, '00'O);
+}
+testcase TC_attach_pdp_act_user_deact_mt() runs on test_CT {
+	var BSSGP_ConnHdlr vc_conn;
+	f_init();
+	vc_conn := f_start_handler(refers(f_TC_attach_pdp_act_user_deact_mt), testcasename(), g_gb[0], 22);
+	vc_conn.done;
+}
+
+
 
 control {
 	execute( TC_attach() );
@@ -1117,6 +1155,7 @@
 	execute( TC_attach_pdp_act_user() );
 	execute( TC_attach_pdp_act_ggsn_reject() );
 	execute( TC_attach_pdp_act_user_deact_mo() );
+	execute( TC_attach_pdp_act_user_deact_mt() );
 }