sgsn: introduce TC_attach_rau_a_b

MS <-> SGSN: Successful Attach
MS  -> SGSN: Routing Area _a_ Update Request
MS <-  SGSN: Routing Area _a_ Update Accept
MS  -> SGSN: Routing Area _b_ Update Request
MS <-  SGSN: Routing Area _b_ Update Accept
MS  -> SGSN: Detach (PowerOff)

Change-Id: Ie636778628c216e315bd6f5bc11e0e5bd9c218a5
diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index 497e45f..edc19bc 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -1899,6 +1899,39 @@
 	vc_conn.done;
 }
 
+private function f_TC_attach_rau_a_b(charstring id) runs on BSSGP_ConnHdlr {
+	var BssgpDecoded bd;
+
+	f_TC_attach(id);
+
+	log("attach complete sending rau");
+	f_routing_area_update(g_pars.ra, 0);
+
+	log("rau complete unregistering");
+	f_bssgp_client_unregister(g_pars.imsi);
+	f_bssgp_client_register(g_pars.imsi, g_pars.tlli, g_pars.bssgp_cell_id[1], BSSGP_PROC[1]);
+
+	log("sending second RAU via different RA");
+	f_routing_area_update(f_cellid_to_RAI(g_pars.bssgp_cell_id[1]), 1);
+
+	f_detach_mo(c_GMM_DTT_MO_GPRS, true, true, 1);
+}
+
+testcase TC_attach_rau_a_b() runs on test_CT {
+	/* MS <-> SGSN: Successful Attach
+	 * MS  -> SGSN: Routing Area _a_ Update Request
+	 * MS <-  SGSN: Routing Area _a_ Update Accept
+	 * MS  -> SGSN: Routing Area _b_ Update Request
+	 * MS <-  SGSN: Routing Area _b_ Update Accept
+	 * MS  -> SGSN: Detach (PowerOff)
+	 */
+	var BSSGP_ConnHdlr vc_conn;
+	f_init();
+	f_sleep(1.0);
+	vc_conn := f_start_handler(refers(f_TC_attach_rau_a_b), testcasename(), g_gb, 38);
+	vc_conn.done;
+}
+
 control {
 	execute( TC_attach() );
 	execute( TC_attach_mnc3() );
@@ -1925,6 +1958,7 @@
 	execute( TC_rau_unknown() );
 	execute( TC_attach_rau() );
 	execute( TC_attach_rau_a_a() );
+	execute( TC_attach_rau_a_b() );
 	execute( TC_detach_unknown_nopoweroff() );
 	execute( TC_detach_unknown_poweroff() );
 	execute( TC_detach_nopoweroff() );