I think I’ve found a bug: if there is anything before, but on the same line as, the ns form in a file, CIDER doesn’t recognize tests defined by cider-test-defining-forms and you get the error “No test at point” even when the point is in a test. Minimal example:

1 (ns some-test
    (:require [clojure.test :refer [deftest is]]))

(deftest unrecognized-test
  (is (= 1 1)))