@Test
 public void testToString() throws Exception {
   JUnitUtils.assertDoesNotThrow(() -> new IsLongPredicate().toString());
 }
 @Test
 public void testToString() throws Exception {
   JUnitUtils.assertDoesNotThrow(() -> new IsEnumPredicate(SampleEnum.class).toString());
 }
 @Test
 public void testToString() throws Exception {
   JUnitUtils.assertDoesNotThrow(() -> new ListLengthPredicate(0, 5).toString());
 }