Compojure-api testing

trouble testing routes in an app that uses compojure-api. One of the handlers is asynchronous and returns a channel. The server runs fine, but when running tests the async handler produces the following exception:

java.lang.IllegalArgumentException: No implementation of method: :render of protocol: #'compojure.response/Renderable found for class: clojure.core.async.impl.channels.ManyToManyChannel```
(edited)
Since i’m using lein-ring to run the server and build the uberjar and it works fine under those conditions, I assume I’ve missed some bit of configuration in the tests. If anyone could point me in the direction of some docs (or a solution!) it’d be much appreciated. I can’t find anything that looks relevant on the repos for compojure-api or ring

Start by reproducing the exception in the route tests and compare that setup with the lein-ring server and uberjar configuration. The issue names no source file or test; done would require identifying the missing test configuration and confirming that asynchronous handlers returning channels can be tested without the Renderable exception.