/**
* Tests the formatting (3 element tree).
*/
public void testToDot3Elements() throws Exception {
Node ast = new Node(Token.BLOCK);
ast.addChildToBack(new Node(Token.NAME));
ast.addChildToBack(new Node(Token.STRING));
String expected = "digraph AST {\n" +
" node [color=lightblue2, style=filled];\n" +
" node0 [label=\"BLOCK\"];\n" +