@Test
void add() {

    root.addChild(Literal.<String>builder("a").then(Literal.<String>builder("child").build()).build());
    
    tree.add(root, commands, "", command -> !command.getName().equalsIgnoreCase("b"));
    
    assertEquals(1, root.getChildren().size());
    assertNotNull(root.getChild("a").getChild("child"));
}