diff --git a/contrib/async-test/aggr.thrift b/contrib/async-test/aggr.thrift
new file mode 100644
index 0000000..c016a65
--- /dev/null
+++ b/contrib/async-test/aggr.thrift
@@ -0,0 +1,8 @@
+exception Error {
+  1: string desc;
+}
+
+service Aggr {
+  void addValue(1: i32 value);
+  list<i32> getValues() throws (1: Error err);
+}