childio: t_cat: Test leak

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/src/childio.rs b/src/childio.rs
index d6a6111e7113766dd8fe57257e8a85ae5aa7b322..1bccd2ff8ffe3087d4faf95d192e57772a6d9fbf 100644 (file)
--- a/src/childio.rs
+++ b/src/childio.rs
@@ -177,6 +177,11 @@ fn t_cat() {
     assert_eq!( r.read(&mut buf).unwrap(), 2 );
     assert_eq!(&buf[0..2], b"hi");
   }
+
+  let w = capture_warns::run(&||{
+    let (_w, _r) = setup();
+  });
+  assert_eq!( &w, &[] as &[String] );
 }
 
 #[test]