@Test
public void testCompare_DE_NULL() {

  assertThat(TRANSLATION_COMPARATOR.compare(
    new Translation(Language.of("de"), "de"),
    null
  )).isLessThan(0);
  assertThat(TRANSLATION_COMPARATOR.compare(
    null,
    new Translation(Language.of("de"), "de")
  )).isGreaterThan(0);
}