@Test
public void testExtLinkAttribute() throws Exception {
l.setExtLink(new URL("http://example.com"));
assertEquals(new URL("http://example.com"), l.getExtLink());
assertEquals("http://example.com", l.getAttribute("extlink"));
l.setExtLink(null);
assertEquals("", l.getAttribute("extlink"));
assertNull(l.getExtLink());
l.setAttribute("extlink", "http://example.com");
assertEquals(new URL("http://example.com"), l.getExtLink());
assertEquals("http://example.com", l.getAttribute("extlink"));
l.setAttribute("extlink", null);
assertEquals("", l.getAttribute("extlink"));
assertNull(l.getExtLink());
}
