@Test
public void getGravatarUrlSizeTest() {

    Assert.assertEquals("https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61.jpg?d=mm&s=200", GravatarUtil.getGravatarUrl("admin@example.com", 200));
    String s = null;
    Assert.assertEquals("https://www.gravatar.com/avatar/00000000000000000000000000000000.jpg?d=mm&s=200", GravatarUtil.getGravatarUrl(s, 200));
}