@Test
public void testEqual() {

    LOG.info("testEqual");
    final String s0 = "";
    final String s1 = "abc";
    final String s2 = "abc";
    final String s3 = "Abc";
    Assert.assertTrue(Objects.equal(null, null));
    Assert.assertFalse(Objects.equal(s0, null));
    Assert.assertFalse(Objects.equal(null, s0));
    Assert.assertFalse(Objects.equal(s1, null));
    Assert.assertFalse(Objects.equal(null, s1));
    Assert.assertTrue(Objects.equal(s1, s1));
    Assert.assertTrue(Objects.equal(s1, s2));
    Assert.assertFalse(Objects.equal(s1, s3));
}