add assertion

test/wanijo/infra/system_test.clj

@@ -169,7 +169,8 @@
                       -[:of]->(rev:revision)
                       -[:of]->(i:instance)
                 WHERE i.uuid = '" (:uuid instance) "'
-                RETURN rp.value"))))))
+                RETURN rp.value"))))
+      (is (= 1 (single-result "MATCH (r:revision) RETURN COUNT(r)")))))
 
   (testing "delete first instance"
     (inst-routes/route-delete! (:uuid instance))