[vala/0.40] tests: Extend "struct with delegate" test to increase coverage

[Rico Tzschichholz <ricotz src gnome org>]

commit aa490ad81b803e7e7c051ae682dd4c239c009ae3
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Mar 10 18:14:09 2019 +0100

    tests: Extend "struct with delegate" test to increase coverage

 tests/structs/structs.vala | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/tests/structs/structs.vala b/tests/structs/structs.vala
index ae4e6f734..dabe021d8 100644
--- a/tests/structs/structs.vala
+++ b/tests/structs/structs.vala
@@ -29,9 +29,10 @@ struct StructWithNamedCreationMethod {
 delegate void Func ();
 
 struct StructWithFunc {
-       int foo;
+       public Func foo;
 
-       public StructWithFunc (Func f) {
+       public StructWithFunc (owned Func f) {
+               foo = (owned) f;
        }
 }