Another atom-chlorine-setup update: I've added a rebl-run-side-tests function bound to ctrl-; X which uses the current namespace to try to guess the corresponding test namespace (by appending either -test or -expectations), requiring it, and running the tests in it. The summary is displayed in a popup (just like the regular run tests in current ns command built-into Chlorine) as well as being displayed inline, and submitted to REBL if present. The test results are displayed as output in the Chlorine REPL tab (again, like the built-in command). This allows you to run tests on a namespace without needing to switch to the corresponding test namespace first (something CIDER offers I believe).