@Test
public void whenToApiEntityFromDomainEntity() {

    CompetitionGroupSet domainEntity = DomainEntityTestUtils.fullCompetitionGroupSet();
    CompetitionGroupSetApiEntity expected = ApiEntityTestUtils.fullCompetitionGroupSet();
    CompetitionGroupSetApiEntity actual = mapper.toApiEntity(domainEntity);
    assertThat(actual).isEqualTo(expected);
}