Adding children at runtime without html macro

[Tarnadas]

Hey,

I'm trying to add children to a previously generated Node.
I need this, because I don't yet know how my DOM looks like at compile time.
I thought this would be possible with this code snippet, however it fails:

#[test]
fn test() {
    use typed_html::dom::{DOMTree, VNode};
    use typed_html::html;

    let mut root: DOMTree<String> = html!(<div></div>);
    let s = "Hello World";
    if let VNode::Element(root) = &mut root.vnode() {
        root.children.push(VNode::Text(s.as_ref()));
    };

    assert_eq!(root.to_string(), "<div>Hello World</div>");
}

thread 'test' panicked at 'assertion failed: (left == right)
left: "<div></div>",
right: "<div>Hello World</div>"', ui/main.rs:34:5

I get the same error for non-text nodes.