@Test
public void testNvl() throws Exception {

  assertNull(nvl(null, null));
  for (int i = 0; i < 100; ++i) {
    assertNotNull(ObjectUtils.nvl(randomUUID().toString(), randomUUID().toString()));
  }
  for (int i = 0; i < 100; ++i) {
    assertNotNull(ObjectUtils.nvl(randomUUID().toString(), randomUUID().toString(),
        randomUUID().toString()));
  }
}