clarify an error message in case of wrong middleware kind. fixes #62

Author: darkleaf

src/darkleaf/di/core.clj

@@ -198,7 +198,8 @@
       (map? mw)               (recur (apply-map registry mw) tail)
       (instance? Function mw) (recur (.apply ^Function mw registry) tail)
       (sequential? mw)        (recur registry (concat mw tail))
-      :else                   (throw (IllegalArgumentException. "Wrong middleware kind")))))
+      :else                   (throw (IllegalArgumentException.
+                                      (str "Wrong middleware kind: " mw))))))
 
 (declare var->factory)
 

test/darkleaf/di/registries_test.clj

@@ -53,3 +53,11 @@
 (t/deftest null-registry-middleware-test
   (with-open [root (di/start `root (null-registry-middleware))]
     (t/is (= 'root @root))))
+
+
+(declare unbound-var)
+
+(t/deftest unboud-var-test
+  (t/is (thrown-with-msg? IllegalArgumentException
+                          #"\AWrong middleware kind: Unbound: #'darkleaf.di.registries-test/unbound-var\z"
+                          (di/start `root unbound-var))))