more fixes with initialize

Author: Carreau

tests/extension/mockextensions/app.py

@@ -14,7 +14,7 @@
 
 EVENT_SCHEMA = """\
 $id: https://events.jupyter.org/mockapp/v1/test
-version: 1
+version: '1'
 properties:
   msg:
     type: string

tests/extension/test_app.py

@@ -32,6 +32,7 @@ def mock_extension(extension_manager):
     pkg = extension_manager.extensions[name]
     point = pkg.extension_points["mockextension"]
     app = point.app
+    app.initialize()
     return app
 
 

tests/services/events/mockextension/mock_extension_event.yaml

@@ -1,5 +1,5 @@
 $id: http://event.mockextension.jupyter.org/message
-version: 1
+version: "1"
 title: Message
 description: |
   Emit a message