diff --git a/test/TestUniqueness.py b/test/TestUniqueness.py
new file mode 100644
index 00000000..baf3792c
--- /dev/null
+++ b/test/TestUniqueness.py
@@ -0,0 +1,23 @@
+import unittest
+from BaseClasses import MultiWorld
+from worlds.AutoWorld import AutoWorldRegister
+
+
+class TestBase(unittest.TestCase):
+    world: MultiWorld
+    _state_cache = {}
+
+    def testUniqueItems(self):
+        known_item_ids = set()
+        for gamename, world_type in AutoWorldRegister.world_types.items():
+            current = len(known_item_ids)
+            known_item_ids |= set(world_type.item_id_to_name)
+            self.assertEqual(len(known_item_ids) - len(world_type.item_id_to_name), current)
+
+    def testUniqueLocations(self):
+        known_location_ids = set()
+        for gamename, world_type in AutoWorldRegister.world_types.items():
+            current = len(known_location_ids)
+            known_location_ids |= set(world_type.location_id_to_name)
+            self.assertEqual(len(known_location_ids) - len(world_type.location_id_to_name), current)
+