db: Add testcase for the db migration.
diff --git a/openbsc/src/libmsc/db.c b/openbsc/src/libmsc/db.c
index 7746e44..1580acd 100644
--- a/openbsc/src/libmsc/db.c
+++ b/openbsc/src/libmsc/db.c
@@ -271,6 +271,8 @@
 	dbi_result result;
 	struct gsm_sms *sms;
 
+	LOGP(DDB, LOGL_NOTICE, "Going to migrate from revision 3\n");
+
 	result = dbi_conn_query(conn, "BEGIN EXCLUSIVE TRANSACTION");
 	if (!result) {
 		LOGP(DDB, LOGL_ERROR,