Pedigree { @JsonIgnore public Individual getIndividualById(String individualId) { return individualsById.get(individualId); } private  Pedigree(Collection<Individual> individuals); static Pedigree of(Collection<Individual> individuals); static Pedigree of(Individual... individuals); static Pedigree justProband(String id); static Pedigree empty(); @JsonIgnore boolean containsId(String id); @JsonIgnore Individual getIndividualById(String individualId); Set<Individual> getIndividuals(); @JsonIgnore Set<String> getIdentifiers(); @JsonIgnore int size(); @JsonIgnore boolean isEmpty(); @JsonIgnore int numFamilies(); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString();  }
@Test public void testGetIndividualById() { Pedigree instance = Pedigree.of(PROBAND, MOTHER, FATHER); assertThat(instance.getIndividualById(MOTHER.getId()), equalTo(MOTHER)); }