object: Add restart nodes lock object tests nspcc-dev#550

The test_the_object_lock_should_be_kept_after_restarting_the_nodes
test added.
This test verifies the issue
nspcc-dev/neofs-node#1502

Signed-off-by: Oleg Kulachenko <oleg@nspcc.ru>

pytest_tests/testsuites/object/test_object_lock.py

@@ -18,7 +18,7 @@
     OBJECT_NOT_FOUND,
 )
 from neofs_testlib.shell import Shell
-from node_management import drop_object
+from node_management import drop_object, restart_storage_nodes
 from pytest import FixtureRequest
 from python_keywords.container import create_container
 from python_keywords.neofs_verbs import delete_object, head_object, lock_object
@@ -663,3 +663,29 @@ def test_link_object_of_complex_object_should_also_be_protected_from_deletion(
                     self.shell,
                     self.cluster.default_rpc_endpoint,
                 )
+
+    @allure.title("Locked object should be protected from deletion after the storage nodes are restarted")
+    @pytest.mark.parametrize(
+        # Only complex objects are required for this test
+        "locked_storage_object",
+        [pytest.lazy_fixture("complex_object_size")],
+        indirect=True,
+    )
+    def test_the_object_lock_should_be_kept_after_restarting_the_nodes(
+            self,
+            locked_storage_object: StorageObjectInfo,
+    ):
+        """
+        Lock objects should fill metabase on resync_metabase
+        """
+        restart_storage_nodes(self.cluster.storage_nodes)
+
+        with allure.step(f"Try to delete object {locked_storage_object.oid}"):
+            with pytest.raises(Exception, match=OBJECT_IS_LOCKED):
+                delete_object(
+                    locked_storage_object.wallet_file_path,
+                    locked_storage_object.cid,
+                    locked_storage_object.oid,
+                    self.shell,
+                    self.cluster.default_rpc_endpoint,
+                )