@Test
public void testExtractLinksNone() {

    List<String> links = null;
            
    links = RegexUtils.extractLinks(null);
    assertNotNull(links);
    assertEquals(0, links.size());
    
    links = RegexUtils.extractLinks("");
    assertNotNull(links);
    assertEquals(0, links.size());
    
    links = RegexUtils.extractLinks(
            "Test with no links " +
            "What about www.google.com");
    assertNotNull(links);
    assertEquals(0, links.size());
}