@Test
public void parsePedigreeUnknownSex() {

    Pedigree.Individual zero = PedFiles.parsePedigree(Stream.of("1\tManuel\t0\t0\t0\t0"))
            .getIndividuals().stream().findFirst().orElse(Pedigree.Individual.builder().build());
    assertThat(zero.getSex(), equalTo(Sex.UNKNOWN));
    Pedigree.Individual minusNine = PedFiles.parsePedigree(Stream.of("1\tManuel\t0\t0\t42\t0"))
            .getIndividuals().stream().findFirst().orElse(Pedigree.Individual.builder().build());
    assertThat(minusNine.getSex(), equalTo(Sex.UNKNOWN));
}