single node tests
diff --git a/koder.yaml b/koder.yaml
index 404e1e9..028a975 100644
--- a/koder.yaml
+++ b/koder.yaml
@@ -12,6 +12,7 @@
         cfg: tests/io_task_test.cfg
         params:
             SOME_OPT: 12
+            FILENAME: /tmp/xxx.bin
     - pgbench:
          num_clients: "4,8,12"
          transactions_per_client: "1,2,3"