Example of inspecting core.async state in between tests

core_async_tests.cljs

(ns radiator-react-native.app-test
  (:require [cljs.core.async :as async :refer [<!]]
            [cljs.core.async.impl.dispatch :as async.dispatch]
            [cljs.test :refer [deftest testing is use-fixtures async]])
  (:require-macros [cljs.core.async.macros :refer [go]]))

(enable-console-print!)

(def check-async-status
  {:after (fn []
            (prn {:queued? async.dispatch/queued?
                  :running? async.dispatch/running?
                  :task-count (.-length async.dispatch/tasks)}))})

(use-fixtures :each check-async-status)

(defn identity-chan
  [x]
  (let [c (async/chan 1)]
    (go (>! c x)
        (async/close! c))
    c))

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

;; after this test runs, I get {:queued? false, :running? false, :task-count 0}

(deftest test-identity-chan
  (async done
         (async/close! (go
                         (is (= (<! (identity-chan 42)) 42))
                         (done)))))

;; after this test runs, I get {:queued? true, :running? true, :task-count 0}