diff --git a/tests/conftest.py b/tests/conftest.py
index cacaf6d..7072596 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -552,7 +552,7 @@ def tarantool_client(db_context):  # TODO Here add TarantoolConnectionClass
 #
 
 @pytest.fixture
-def utxo_collection(tarantool_client):
+def utxo_collection(tarantool_client, _setup_database):
     return tarantool_client.get_space("utxos")
 
 
@@ -568,10 +568,12 @@ def dummy_unspent_outputs():
 @pytest.fixture
 def utxoset(dummy_unspent_outputs, utxo_collection):
     from json import dumps
+    num_rows_before_operation = utxo_collection.select().rowcount
     for utxo in dummy_unspent_outputs:
         res = utxo_collection.insert((utxo["transaction_id"], utxo["output_index"], dumps(utxo)))
         assert res
-    assert len(utxo_collection.select()) == 3
+    num_rows_after_operation = utxo_collection.select().rowcount
+    assert num_rows_after_operation == num_rows_before_operation + 3
     return dummy_unspent_outputs, utxo_collection
 
 
diff --git a/tests/tendermint/test_lib.py b/tests/tendermint/test_lib.py
index d016867..82f1eea 100644
--- a/tests/tendermint/test_lib.py
+++ b/tests/tendermint/test_lib.py
@@ -288,9 +288,11 @@ def test_store_bulk_transaction(mocker, b, signed_create_tx,
 @pytest.mark.bdb
 def test_delete_zero_unspent_outputs(b, utxoset):
     unspent_outputs, utxo_collection = utxoset
+    num_rows_before_operation = utxo_collection.select().rowcount
     delete_res = b.delete_unspent_outputs()
+    num_rows_after_operation = utxo_collection.select().rowcount
     # assert delete_res is None
-    assert utxo_collection.select().rowcount == 3
+    assert num_rows_before_operation == num_rows_after_operation
     # assert utxo_collection.count_documents(
     #     {'$or': [
     #         {'transaction_id': 'a', 'output_index': 0},
@@ -350,9 +352,11 @@ def test_delete_many_unspent_outputs(b, utxoset):
 
 @pytest.mark.bdb
 def test_store_zero_unspent_output(b, utxo_collection):
+    num_rows_before_operation = utxo_collection.select().rowcount
     res = b.store_unspent_outputs()
+    num_rows_after_operation = utxo_collection.select().rowcount
     assert res is None
-    assert utxo_collection.select().rowcount == 0
+    assert num_rows_before_operation == num_rows_after_operation
 
 
 @pytest.mark.bdb