diff --git a/tests/Test.expected b/tests/Test.expected
index d8b21b9..5440aa8 100644
--- a/tests/Test.expected
+++ b/tests/Test.expected
@@ -12,6 +12,7 @@
 
 /* calls */
 void Test_Test(App * app, AppServerClient * client, int32_t i32);
-void Test_Test2(App * app, AppServerClient * client, int32_t * i32);
+bool Test_Test2(App * app, AppServerClient * client, int32_t * i32);
+String const * Test_Test3(App * app, AppServerClient * client, int32_t *);
 
 #endif /* !Test_Test_H */
diff --git a/tests/Test.interface b/tests/Test.interface
index d7c519d..82c8782 100644
--- a/tests/Test.interface
+++ b/tests/Test.interface
@@ -2,9 +2,13 @@
 service=Test
 
 [call::Test]
-#ret=void
+ret=VOID
 arg1=INT32,i32
 
 [call::Test2]
-#ret=void
+ret=BOOL
 arg1=INT32_INOUT,i32
+
+[call::Test3]
+ret=STRING
+arg1=INT32_INOUT