logging-is-weird.clj

            ;; works                                                                                                                                                               
            (let [factory clojure.tools.logging/*logger-factory*]
              (try
                (alter-var-root #'clojure.tools.logging/*logger-factory*
                                (constantly clojure.tools.logging.impl/disabled-logger-factory))
                (is (thrown-with-msg? Exception #"Message not processed"
                                      (test-utils/process-message! msg 2)))
                (finally
                  (alter-var-root #'clojure.tools.logging/*logger-factory* factory))))

            ;; doesn't work                                                                                                                                                        
            (with-redefs [clojure.tools.logging/*logger-factory*
                          clojure.tools.logging.impl/disabled-logger-factory]
              (is (thrown-with-msg? Exception #"Message not processed"
                                    (test-utils/process-message! msg 2))))