diff --git a/docs/extensiondev.rst b/docs/extensiondev.rst
index 72747e28..f5929ec4 100644
--- a/docs/extensiondev.rst
+++ b/docs/extensiondev.rst
@@ -586,7 +586,7 @@ Test cases for checking the definition of the extension should ensure that:
 
 An example of what these tests could look like is provided below::
 
-    def test_get_default_config(self):
+    def test_get_default_config():
         ext = Extension()
         config = ext.get_default_config()
 
@@ -596,7 +596,7 @@ An example of what these tests could look like is provided below::
         assert 'param_2 = value_2' in config
         assert 'param_n = value_n' in config
 
-    def test_get_config_schema(self):
+    def test_get_config_schema():
         ext = Extension()
         schema = ext.get_config_schema()
 
@@ -605,7 +605,7 @@ An example of what these tests could look like is provided below::
         assert 'param_2' in schema
         assert 'param_n' in schema
 
-    def test_setup(self):
+    def test_setup():
         registry = mock.Mock()
 
         ext = Extension()
@@ -783,4 +783,4 @@ the events fire::
 
 For further details and examples, refer to the
 `/tests <https://github.com/mopidy/mopidy/tree/develop/tests>`_
-directory on the Mopidy development branch.
\ No newline at end of file
+directory on the Mopidy development branch.