Add a test for Clone (for groups)

Author: aldanor

hdf5-rs/src/hl/group.rs

@@ -199,6 +199,25 @@ pub mod tests {
         })
     }
 
+    #[test]
+    pub fn test_clone() {
+        with_tmp_file(|file| {
+            file.create_group("a").unwrap();
+            let a = file.group("a").unwrap();
+            assert_eq!(a.name(), "/a");
+            assert_eq!(a.file().unwrap().id(), file.id());
+            assert_eq!(a.refcount(), 1);
+            let b = a.clone();
+            assert_eq!(b.name(), "/a");
+            assert_eq!(b.file().unwrap().id(), file.id());
+            assert_eq!(b.refcount(), 2);
+            assert_eq!(a.refcount(), 2);
+            drop(a);
+            assert_eq!(b.refcount(), 1);
+            assert!(b.is_valid());
+        })
+    }
+
     #[test]
     pub fn test_len() {
         with_tmp_file(|file| {