diff --git a/csys/environ.lisp b/csys/environ.lisp
index 5d00601..4c78d8d 100644
--- a/csys/environ.lisp
+++ b/csys/environ.lisp
@@ -38,7 +38,7 @@
 (defun forward (msg scope)
   (dolist (cell (find-cells (cells scope) (message:addr msg))) 
     (actor:send cell msg))
-  msg)
+  nil)
  
 ;;;; helpers
 
diff --git a/test/test-core.lisp b/test/test-core.lisp
index bd9c946..648c502 100644
--- a/test/test-core.lisp
+++ b/test/test-core.lisp
@@ -37,6 +37,7 @@
 (defun check-message (ctx msg)
   (let ((key (shape:head msg))
         (t:*test-suite* (suite ctx)))
+    (util:lgi (expected ctx))
     (multiple-value-bind (val found) (gethash key (expected ctx))
       (if found
         (progn
diff --git a/test/test-csys.lisp b/test/test-csys.lisp
index 9932b95..7f55dcc 100644
--- a/test/test-csys.lisp
+++ b/test/test-csys.lisp
@@ -29,7 +29,8 @@
 
 (defun setup-config ()
   (config:add :test-receiver :setup #'tc:setup)
-  (config:add-action '(:csys :notify :c00 "0-0") (value-in '(1)))
+  ;(config:add-action '(:csys :notify :c00 "0-0") (value-in '(1)))
+  (config:add-action '(:csys :notify) #'tc:check-message)
   (config:add-action '(:csys) (constantly nil))
   )
 
@@ -38,7 +39,8 @@
     (util:mv-bind (nmsg (scope scope)) 
         (csys:handle-action msg scope :actions (environ:actions))
       (util:lgi nmsg (tc:receiver t:*test-suite*))
-      (actor:send (core:mailbox (tc:receiver t:*test-suite*)) nmsg))))
+      (when nmsg
+        (actor:send (core:mailbox (tc:receiver t:*test-suite*)) nmsg)))))
 
 (defun run ()
   (let ((t:*test-suite* (make-instance 'tc:test-suite :name "csys")))
@@ -47,6 +49,7 @@
     (unwind-protect
       (test-basic-0)
       (sleep 0.1)
+      (tc:check-expected)
       (t:show-result))))
 
 ;;;; test: initialization
@@ -62,8 +65,10 @@
     env))
 
 (deftest test-basic-0 ()
-  (let ((env (setup-test (csys:make-program #'csys:eff-proc))))
+  (let ((env (setup-test (csys:make-program #'csys:eff-proc)))
+        (rcvr (tc:receiver t:*test-suite*)))
     (sleep 0.1)
+    (tc:expect rcvr (message:create '(:csys :notify :c00 "0-0") :data '(:value 1)))
     (actor:send env (message:create '(:csys :value :c00 "0-0") :data '(:value 1)))
     (sleep 0.1)
     (core:shutdown)))