@Test
public void getHgncId() {

    assertThat(EMPTY_GENE_IDENTIFIER.getHgncId(), equalTo(GeneIdentifier.EMPTY_FIELD));
    GeneIdentifier instance = GeneIdentifier.builder()
            .hgncId("hgnc")
            .build();
    assertThat(instance.getHgncId(), equalTo("hgnc"));
}