[librsvg: 2/9] node.rs: Add a test for Children

[Federico Mena Quintero <federico src gnome org>]

commit ddf108423a3e1eaee3005dbf6204d31915f65ea0
Author: Ivan Molodetskikh <yalterz gmail com>
Date:   Thu Mar 15 20:59:40 2018 +0300

    node.rs: Add a test for Children

 rsvg_internals/src/node.rs | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
---
diff --git a/rsvg_internals/src/node.rs b/rsvg_internals/src/node.rs
index c14af5a7..744cc8a1 100644
--- a/rsvg_internals/src/node.rs
+++ b/rsvg_internals/src/node.rs
@@ -629,4 +629,46 @@ mod tests {
         assert!(Node::is_ancestor(node.clone(), child.clone()));
         assert!(!Node::is_ancestor(child.clone(), node.clone()));
     }
+
+    #[test]
+    fn node_children_iterator() {
+        let node = Rc::new(Node::new(
+            NodeType::Path,
+            None,
+            ptr::null_mut(),
+            Box::new(TestNodeImpl {}),
+        ));
+
+        let child = Rc::new(Node::new(
+            NodeType::Path,
+            Some(Rc::downgrade(&node)),
+            ptr::null_mut(),
+            Box::new(TestNodeImpl {}),
+        ));
+
+        let second_child = Rc::new(Node::new(
+            NodeType::Path,
+            Some(Rc::downgrade(&node)),
+            ptr::null_mut(),
+            Box::new(TestNodeImpl {}),
+        ));
+
+        node.add_child(&child);
+        node.add_child(&second_child);
+
+        let mut children = node.children();
+
+        let c = children.next();
+        assert!(c.is_some());
+        let c = c.unwrap();
+        assert!(rc_node_ptr_eq(&c, &child));
+
+        let c = children.next_back();
+        assert!(c.is_some());
+        let c = c.unwrap();
+        assert!(rc_node_ptr_eq(&c, &second_child));
+
+        assert!(children.next().is_none());
+        assert!(children.next_back().is_none());
+    }
 }