MSC: Add test for LU with 2G authentication

Change-Id: I5ea201bd603e581f199cd29056e7e7ebc9bd0923
diff --git a/msc_tests/MSC_Tests.ttcn b/msc_tests/MSC_Tests.ttcn
index dea27a7..15ffc20 100644
--- a/msc_tests/MSC_Tests.ttcn
+++ b/msc_tests/MSC_Tests.ttcn
@@ -418,6 +418,18 @@
 	vc_conn.done;
 }
 
+private function f_tc_lu_imsi_auth_tmsi(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
+	g_pars := pars;
+	f_perform_lu(true, true, true);
+}
+testcase TC_lu_imsi_auth_tmsi() runs on MTC_CT {
+	var BSC_ConnHdlr vc_conn;
+	f_init();
+
+	vc_conn := f_start_handler(refers(f_tc_lu_imsi_auth_tmsi), testcasename(), 5);
+	vc_conn.done;
+}
+
 
 /* Send CM SERVICE REQ for IMSI that has never performed LU before */
 private function f_tc_cmserv_imsi_unknown(charstring id, BSC_ConnHdlrPars pars)