diff --git a/i3pystatus/core/modules.py b/i3pystatus/core/modules.py
index 152f754..c9b66d9 100644
--- a/i3pystatus/core/modules.py
+++ b/i3pystatus/core/modules.py
@@ -40,8 +40,8 @@ class Module(SettingsBase):
         It then triggers the callback depending on the nature (ie type) of
         the callback variable:
         1. if null callback, do nothing
-        2. if it's a python function
-        3. if it's a method of the current module
+        2. if it's a python function ()
+        3. if it's the name of a method of the current module (string)
 
         To setup the callbacks, you can set the settings 'on_leftclick',
         'on_rightclick', 'on_upscroll', 'on_downscroll'.
@@ -58,6 +58,7 @@ class Module(SettingsBase):
                     ],
                     on_leftclick= ["urxvtc"] , # launch urxvtc on left click
                     on_rightclick= ["scroll_format", 2] , # update format by steps of 2
+                    on_upscroll= [print, "hello world"] , # call python function print
                     log_level=logging.DEBUG,
                     )
         """
diff --git a/tests/test_callbacks.py b/tests/test_callbacks.py
new file mode 100644
index 0000000..5b2fbd0
--- /dev/null
+++ b/tests/test_callbacks.py
@@ -0,0 +1,68 @@
+import unittest
+
+
+from i3pystatus.core.modules import Module
+
+
+class CallbacksMetaTest(unittest.TestCase):
+
+    valid_msg_count = "hello world"
+    notmuch_config = "notmuch-config"
+
+    @staticmethod
+    def send_clicks(module):
+        # simulate click events for buttons 1 to 10
+        for button in range(1, 10):
+            module.on_click(button)
+
+    class NoDefaultCounter(Module):
+
+        counter = 0
+
+        def update_counter(self, step=1):
+            self.counter = self.counter + step
+
+    class WithDefaultsCounter(NoDefaultCounter):
+        on_leftclick = "update_counter"
+        on_rightclick = ["update_counter", 2]
+        on_upscroll = ["callable_callback", "i3 is", "awesome"]
+        on_downscroll = ["update_counter", -1]
+
+    def test_count_is_correct(self):
+        """Checks module works in the intended way, ie increase correctly
+        a counter"""
+        counter = self.NoDefaultCounter()
+        self.assertEqual(counter.counter, 0)
+        counter.update_counter(1)
+        self.assertEqual(counter.counter, 1)
+        counter.update_counter(2)
+        self.assertEqual(counter.counter, 3)
+        counter.update_counter(-2)
+        self.assertEqual(counter.counter, 1)
+
+        CallbacksMetaTest.send_clicks(counter)
+
+        # retcode, out, err = run_through_shell("notmuch --config=%s new" % (self.notmuch_config), enable_shell=True)
+
+        # self.assertEqual(out.strip(), self.valid_output)
+    def test_callback_set_post_instanciation(self):
+
+        counter = self.NoDefaultCounter()
+
+        # set callbacks
+        counter.on_leftclick = "update_counter"
+        counter.on_rightclick = ["update_counter", 2]
+        counter.on_upscroll = [print, "i3 is", "awesome"]
+        counter.on_downscroll = ["update_counter", -1]
+
+        self.assertEqual(counter.counter, 0)
+        counter.on_click(1)  # left_click
+        self.assertEqual(counter.counter, 1)
+        counter.on_click(2)  # middle button
+        self.assertEqual(counter.counter, 1)
+        counter.on_click(3)  # right click
+        self.assertEqual(counter.counter, 3)
+        counter.on_click(4)  # upscroll
+        self.assertEqual(counter.counter, 3)
+        counter.on_click(5)  # downscroll
+        self.assertEqual(counter.counter, 2)