diff --git a/test/DebugProtoTest.thrift b/test/DebugProtoTest.thrift
index d3d2580..9ba60a2 100644
--- a/test/DebugProtoTest.thrift
+++ b/test/DebugProtoTest.thrift
@@ -250,4 +250,19 @@
 
 service ReverseOrderService {
   void myMethod(4: string first, 3: i16 second, 2: i32 third, 1: i64 fourth);
+}
+
+union TestUnion {
+  /**
+   * A doc string
+   */
+  1: string string_field;
+  2: i32 i32_field;
+  3: OneOfEach struct_field;
+  4: list<RandomStuff> struct_list;
+  5: i32 other_i32_field;
+}
+
+struct StructWithAUnion {
+  1: TestUnion test_union;
 }
\ No newline at end of file