public void testDefaultStringWithNullStringAndNullDefault() {
   String s = StringUtils.defaultString(null, null);
   Assert.assertEquals(null, s);
 }
 public void testDefaultStringWithGoodStringAndGoodDefault() {
   String testString = "test string";
   String s = StringUtils.defaultString(testString, "test Default");
   Assert.assertEquals(testString, s);
 }
 public void testDefaultStringWithNullStringAndGoodDefault() {
   String testDefault = "test Default";
   String s = StringUtils.defaultString(null, testDefault);
   Assert.assertEquals(testDefault, s);
 }