@Test
public void testTrimToNull() {

  assertEquals("aCcepTed", NormalizeUtils.trimToNull("aCcepTed "));
  assertEquals("nuller", NormalizeUtils.trimToNull("nuller "));
  assertNull(NormalizeUtils.trimToNull("NuLL "));
  assertNull(NormalizeUtils.trimToNull(" "));
  assertNull(NormalizeUtils.trimToNull(" NULL "));
  assertNull(NormalizeUtils.trimToNull("       "));
  assertNull(NormalizeUtils.trimToNull("\\N "));
}