diff --git a/clap-test.rs b/clap-test.rs
index 2f91b9e8..3e01edee 100644
--- a/clap-test.rs
+++ b/clap-test.rs
@@ -39,6 +39,16 @@ mod test {
         assert_eq!(stderr, err.use_stderr());
         compare(left, right)
     }
+    pub fn compare_output2(l: App, args: &str, right1: &str, right2: &str, stderr: bool) -> bool {
+        let mut buf = Cursor::new(Vec::with_capacity(50));
+        let res = l.get_matches_from_safe(args.split(' ').collect::<Vec<_>>());
+        let err = res.unwrap_err();
+        err.write_to(&mut buf).unwrap();
+        let content = buf.into_inner();
+        let left = String::from_utf8(content).unwrap();
+        assert_eq!(stderr, err.use_stderr());
+        compare(&*left, right1) || compare(&*left, right2)
+    }
 
     // Legacy tests from the pyhton script days