Clojure test: global fixtures

I've got some fixtures that boot up and close the database in my project.

Now it looks something like this:

(use-fixtures :once with-embedded-db)

while in the fixture itself I've got a dynamic variable that I use in different places:

(def ^:dynamic *db*)

(defn with-embedded-db [f]
  (binding [*db* (db/connect args)]
    (f)
    (finally
      (db/clean-up *db)))

Now, assume that db/connect and db/clean-up take some time.

PROBLEM:

When I run tests using lein test, it takes very long time, unnecessarily spending time on connecting and disconnecting to the db for every namespace.

QUESTION:

Is there a way to set up global fixtures so that when I run lein test, it calls it only once for all the test namespaces?

Thanks!