-static int test_filter_list();
-static int test_substring_filter();
-static int test_ava_filter();
-static int test_approx_filter();
-static int test_presence_filter();
+static int test_filter_list(Backend *be, Connection *conn, Operation *op, Entry *e, Filter *flist, int ftype);
+static int test_substring_filter(Backend *be, Connection *conn, Operation *op, Entry *e, Filter *f);
+static int test_ava_filter(Backend *be, Connection *conn, Operation *op, Entry *e, Ava *ava, int type);
+static int test_approx_filter(Backend *be, Connection *conn, Operation *op, Entry *e, Ava *ava);
+static int test_presence_filter(Backend *be, Connection *conn, Operation *op, Entry *e, char *type);