Add test suite skeleton with empty test (auc_3g_test)

Change-Id: I6359b0809ce8578850fd65887a568714fb35dbd8
diff --git a/Makefile.am b/Makefile.am
index 40dad90..0d60cee 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -3,6 +3,7 @@
 SUBDIRS = \
 	src \
 	sql \
+	tests \
 	$(NULL)
 
 EXTRA_DIST = \