add initial db_test: creating and deleting subscribers

Change-Id: I2a0d277f55162bf5ceb0fc7d50390f2994daed71
diff --git a/tests/Makefile.am b/tests/Makefile.am
index d979fb6..0b625f5 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,6 +1,7 @@
 SUBDIRS = \
 	auc \
 	gsup_server \
+	db \
 	$(NULL)
 
 # The `:;' works around a Bash 3.2 bug when the output is not writeable.