diff --git a/tests/res/id_map.json b/tests/res/id_map.json
new file mode 100644
index 0000000..b721196
--- /dev/null
+++ b/tests/res/id_map.json
@@ -0,0 +1,4 @@
+{
+  "1": "2",
+  "5": "2"
+}