testIndent() {
    const tree = makeATree();
    tree.expandAll();

    const node = tree.getChildren()[0].getChildren()[0];
    assertEquals('AAA', node.getHtml());
    assertNotNull(node.getElement());
    assertEquals('19px', node.getRowElement().style.paddingLeft);

    assertEquals(2, node.getDepth());

    const newParent = node.getNextSibling();
    assertEquals('AAB', newParent.getHtml());
    assertEquals(2, newParent.getDepth());

    newParent.add(node);

    assertEquals(newParent, node.getParent());
    assertEquals(node, newParent.getChildren()[0]);
    assertEquals(3, node.getDepth());
    assertEquals('38px', node.getRowElement().style.paddingLeft);
  }
Test moving a node to a greater depth.