testLists() {
    const original = '<ul><li>one</li><ul><li>two</li></UL><li>three</li></ul>';
    const expected =
        '<ul><li>one</li>\n<ul><li>two</li></UL>\n<li>three</li></ul>\n';
    assertEquals(expected, HtmlPrettyPrinter.format(original));
  }
FF3.0 doesn't like \n between <code></li></code> and <code></ul></code>.
See b/1520665.