refactor: classes and configs (#528)

tests/helper_classes/test_json_serializable.py

@@ -59,7 +59,7 @@ class TestJsonSerializable(unittest.TestCase):
     def test_recursive(self):
         """Test recursiveness with the real app"""
         random_id = str(random.random())
-        config = AppConfig(id=random_id)
+        config = AppConfig(id=random_id, collect_metrics=False)
         # config class is set under app.config.
         app = App(config=config)
         # w/o recursion it would just be <embedchain.config.apps.OpenSourceAppConfig.OpenSourceAppConfig object at x>
@@ -67,4 +67,5 @@ class TestJsonSerializable(unittest.TestCase):
         new_app: App = App.deserialize(s)
         # The id of the new app is the same as the first one.
         self.assertEqual(random_id, new_app.config.id)
+        # We have proven that a nested class (app.config) can be serialized and deserialized just the same.
         # TODO: test deeper recursion