diff --git a/tests/backend/localmongodb/test_schema.py b/tests/backend/localmongodb/test_schema.py
index b9b22639..2d89c2ce 100644
--- a/tests/backend/localmongodb/test_schema.py
+++ b/tests/backend/localmongodb/test_schema.py
@@ -99,12 +99,17 @@ def test_create_secondary_indexes():
     indexes = conn.conn[dbname]['assets'].index_information().keys()
     assert set(indexes) == {'_id_', 'asset_id', 'text'}
 
-    indexes = conn.conn[dbname]['transactions'].index_information().keys()
+    index_info = conn.conn[dbname]['transactions'].index_information()
+    indexes = index_info.keys()
     assert set(indexes) == {
             '_id_', 'transaction_id', 'asset_id', 'outputs', 'inputs'}
+    assert index_info['transaction_id']['unique']
 
-    indexes = conn.conn[dbname]['blocks'].index_information().keys()
+    index_info = conn.conn[dbname]['blocks'].index_information()
+    indexes = index_info.keys()
     assert set(indexes) == {'_id_', 'height'}
+    assert index_info['height']['unique']
+
 
     index_info = conn.conn[dbname]['utxos'].index_information()
     assert set(index_info.keys()) == {'_id_', 'utxo'}