msc: Add test case for LU with MI=IMEI (which is illegal)

Change-Id: Ie3c91a0ff212a70a8e03e0579f240a10bc4356f4
diff --git a/msc_tests/BSC_ConnectionHandler.ttcn b/msc_tests/BSC_ConnectionHandler.ttcn
index f9b4d3e..0fb1702 100644
--- a/msc_tests/BSC_ConnectionHandler.ttcn
+++ b/msc_tests/BSC_ConnectionHandler.ttcn
@@ -125,6 +125,16 @@
 	var MobileIdentityLV mi := valueof(ts_MI_IMSI_LV(imsi));
 	return f_build_lu(mi);
 }
+function f_build_lu_imei(hexstring imei) return PDU_ML3_MS_NW
+{
+	var MobileIdentityLV mi := valueof(ts_MI_IMEI_LV(imei));
+	return f_build_lu(mi);
+}
+function f_build_lu_tmsi(OCT4 tmsi) return PDU_ML3_MS_NW
+{
+	var MobileIdentityLV mi := valueof(ts_MI_TMSI_LV(tmsi));
+	return f_build_lu(mi);
+}
 private function f_build_lu(MobileIdentityLV mi) return PDU_ML3_MS_NW
 {
 	var LocationAreaIdentification_V old_lai := { '62F220'O, '9999'O };