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I have looked into that, but I can’t figure out how to swap my state with alternate implementation. I have these macros defined on the 2 datasources:

(defstate datasource
  :start (do (log/info "Starting DB connection pool")
             (hikari/make-datasource (:db config/config)))
  :stop (do (hikari/close-datasource datasource)
            (log/info "Closed DB connection pool")))

(defstate read-only-datasource
  :start (do (log/info "Starting read-only DB connection pool")
             (hikari/make-datasource (merge (:db config/config)
                                            (:read-only-db config/config))))
  :stop (do (hikari/close-datasource datasource)
            (log/info "Closed read-only DB connection pool")))

(defmacro with-transaction [[transaction] & body]
  `(jdbc/with-db-transaction
     [~transaction {:datasource datasource}]
     ~@body))

(defmacro with-read-only-transaction [[transaction] & body]
  `(jdbc/with-db-transaction
     [~transaction {:datasource read-only-datasource}]
     ~@body))

and I want to either replace the state within with-read-only-transaction to use the normal datasource in tests