[vala] Add trivial test for the previous commit

[Luca Bruno <lucabru src gnome org>]

commit 236cf0890d8b9032a3ec5f1b104167435d191e1a
Author: Luca Bruno <lucabru src gnome org>
Date:   Fri Dec 12 16:18:13 2014 +0100

    Add trivial test for the previous commit

 tests/basic-types/integers.vala |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tests/basic-types/integers.vala b/tests/basic-types/integers.vala
index d9ff890..40eebfa 100644
--- a/tests/basic-types/integers.vala
+++ b/tests/basic-types/integers.vala
@@ -1,3 +1,5 @@
+int static_negative_int = -1;
+
 void test_int () {
        // declaration and initialization
        int i = 42;