Refactored Command to add owner

tests/test_integration.py

@@ -34,13 +34,13 @@ def rt(user):
 
 class TestingCommand:
   def test_i_can_trigger_a_command(self, user):
-    command = Command('test', 'TestingCommand', new_value, "this is my new value")
+    command = Command('test', 'TestingCommand', None, new_value, "this is my new value")
     testable = TestableElement(user, mk.button('button', command))
     testable.click()
     assert user.get_content() == "this is my new value"
   
   def test_error_is_raised_when_command_is_not_found(self, user):
-    command = Command('test', 'TestingCommand', new_value, "this is my new value")
+    command = Command('test', 'TestingCommand', None, new_value, "this is my new value")
     CommandsManager.reset()
     testable = TestableElement(user, mk.button('button', command))
     
@@ -50,7 +50,7 @@ class TestingCommand:
     assert "not found." in str(exc_info.value)
   
   def test_i_can_play_a_complex_scenario(self, user, rt):
-    command = Command('test', 'TestingCommand', new_value, "this is my new value")
+    command = Command('test', 'TestingCommand', None, new_value, "this is my new value")
     
     @rt('/')
     def get(): return mk.button('button', command)