gistfile1.clj

(defmacro with-test-db [entity & body]
  `(with-redefs [~entity (database ~entity test-db)]
     ~body))                                                                                                                                                                                               

(fact
  "The job queue table has zero jobs in it to start."
  (with-test-db
    db/job_queue
    (:size (first (persistence/queue-size 12 2)))) => 0)

trace.clj

[rjmdash@localhost]$ lein midje
All namespaces already :aot compiled.

FAIL "The job queue table has zero jobs in it to start." at (main_using_db_test.clj:21)
    Expected: 0
      Actual: java.lang.ClassCastException: java.lang.Long cannot be cast to clojure.lang.IFn
              job_queue.test.main_using_db_test$eval3684$fn__3685$fn__3686$fn__3687.invoke(main_using_db_test.clj:23)
              job_queue.test.main_using_db_test$eval3684$fn__3685$fn__3686.invoke(main_using_db_test.clj:21)
              job_queue.test.main_using_db_test$eval3684$fn__3685.invoke(main_using_db_test.clj:19)
              job_queue.test.main_using_db_test$eval3684.invoke(main_using_db_test.clj:19)
FAILURE: 1 fact was not confirmed. (But 8 were.)