diff --git a/evennia/contrib/grid/xyzgrid/tests.py b/evennia/contrib/grid/xyzgrid/tests.py
index 8e3d727625..4f5ad67bdd 100644
--- a/evennia/contrib/grid/xyzgrid/tests.py
+++ b/evennia/contrib/grid/xyzgrid/tests.py
@@ -6,7 +6,7 @@ Tests for the XYZgrid system.
 
 from random import randint
 from parameterized import parameterized
-from django.test import TestCase
+from django.test import TestCase, override_settings
 from evennia.utils.test_resources import BaseEvenniaTest
 from . import xymap, xyzgrid, xymap_legend, xyzroom
 
@@ -1415,3 +1415,81 @@ class TestBuildExampleGrid(BaseEvenniaTest):
         self.assertTrue(room2a.db.desc.startswith("This is the entrance to"))
         self.assertEqual(room2b.key, "North-west corner of the atrium")
         self.assertTrue(room2b.db.desc.startswith("Sunlight sifts down"))
+
+
+class TestXyzRoom(xyzroom.XYZRoom):
+  def at_object_creation(self):
+    breakpoint()
+
+class TestXyzExit(xyzroom.XYZExit):
+  def at_object_creation(self):
+    breakpoint()
+
+# @override_settings(
+#   XYZEXIT_PROTOTYPE_OVERRIDE= {
+#     "typeclass": "evennia.contrib.grid.xyzgrid.tests.TestXyzExit",
+#   },
+#   XYZROOM_PROTOTYPE_OVERRIDE= {
+#     "typeclass": "evennia.contrib.grid.xyzgrid.tests.TestXyzRoom",
+#   }
+# )
+class TestCallbacks(BaseEvenniaTest):
+    @override_settings(
+      XYZEXIT_PROTOTYPE_OVERRIDE={
+        "typeclass": "evennia.contrib.grid.xyzgrid.tests.TestXyzExit",
+      },
+      XYZROOM_PROTOTYPE_OVERRIDE={
+        "typeclass": "evennia.contrib.grid.xyzgrid.tests.TestXyzRoom",
+      })
+    def setUp(self):
+        super().setUp()
+        
+        from evennia.prototypes import prototypes as protlib
+        for prototype_key in ('xyz_room', 'xyz_exit', 'xyzroom', 'xyzexit'):
+          proto = protlib.search_prototype(
+              prototype_key,
+              # require_single=True,
+              # no_db=True
+          )
+          print(prototype_key, 'found?', proto)
+
+        self.map_data = {
+          "map": """
+
+            + 0 1
+
+            0 #-#
+
+            + 0 1
+
+          """,
+          "zcoord": "map1",
+          "prototypes": {
+             ("*", "*"): {
+               "key": "room",
+               "desc": "A room.",
+               "prototype_parent": "xyz_room",
+             },
+             ("*", "*", "*"): {
+               "desc": "A passage.",
+               "prototype_parent": "xyz_exit",
+             }
+          },
+          "options": {
+            "map_visual_range": 1,
+            "map_mode": "scan",
+          }
+        }
+        self.grid, err = xyzgrid.XYZGrid.create("testgrid")
+
+        def _log(msg):
+             print(msg)
+        self.grid.log = _log
+
+        self.grid.add_maps(self.map_data)
+
+    def tearDown(self):
+        self.grid.delete()
+
+    def test_dummy(self):
+        self.grid.spawn()
diff --git a/evennia/contrib/grid/xyzgrid/xymap_legend.py b/evennia/contrib/grid/xyzgrid/xymap_legend.py
index ff5ea6b0b7..4dfd05a72a 100644
--- a/evennia/contrib/grid/xyzgrid/xymap_legend.py
+++ b/evennia/contrib/grid/xyzgrid/xymap_legend.py
@@ -302,6 +302,7 @@ class MapNode:
         to their destinations.
 
         """
+        # breakpoint()
         global NodeTypeclass
         if not NodeTypeclass:
             from .xyzroom import XYZRoom as NodeTypeclass