diff --git a/tests/unit/db_annotations/test_collection.py b/tests/unit/db_annotations/test_collection.py
index 9d32f42af..3e15150e1 100644
--- a/tests/unit/db_annotations/test_collection.py
+++ b/tests/unit/db_annotations/test_collection.py
@@ -9,6 +9,10 @@ def test_add_update_delete_collection(firestore_emulator, collections_db):
     old_user = "john_doe"
     old_name = "test_collection0"
     _id = collection.add_collection(old_name, old_user, "this is a test")
+
+    with pytest.raises(KeyError):
+        collection.add_collection(old_name, old_user, "this is a test")
+
     _collection = collection.read_collection(_id)
     assert _collection["name"] == old_name
     assert _collection["created_by"] == old_user
diff --git a/tests/unit/db_annotations/test_layer_group.py b/tests/unit/db_annotations/test_layer_group.py
index 6d96c1e77..abf366a29 100644
--- a/tests/unit/db_annotations/test_layer_group.py
+++ b/tests/unit/db_annotations/test_layer_group.py
@@ -24,6 +24,16 @@ def test_add_update_delete_layer_group(firestore_emulator, layer_groups_db):
         layers=layers_ids,
         comment="this is a test",
     )
+
+    with pytest.raises(KeyError):
+        layer_group.add_layer_group(
+            name=old_name,
+            collection_id=collection_id,
+            user=user,
+            layers=layers_ids,
+            comment="this is a test",
+        )
+
     _layer_group = layer_group.read_layer_group(_id)
     assert _layer_group["name"] == old_name
     assert len(cast(list, _layer_group["layers"])) == 2