public void roundtrip(MindMap m) {
MindMap m1 = m;
JSONMindMapBuilder jmmb = new JSONMindMapBuilder();
m1.copyTo(jmmb);
MindMap m2 = new MindMap();
jmmb.copyTo(m2);
compareMaps(m1, m2);
}
private void compareMaps(MindMap m1, MindMap m2) {
if (m1 == m2)