--- a/tests/test_arduino.coffee
+++ b/tests/test_arduino.coffee
@@ -16,10 +16,9 @@ describe 'class ArduinoFirmata', ->
 
   describe 'method list', ->
 
-    it 'should return list of serialports', (done) ->
+    it 'should return list of serialports', ->
       ArduinoFirmata.list (err, devices) ->
-        assert.equal devices instanceof Array, true
-        done()
+        assert.equal (devices instanceof Array), true
 
 
 describe 'instance of ArduinoFirmata', ->