@Test
public void addAllToBuilderWorksAsExpected() {

    final List<DefinitionIdentifier> additionalIdentifiers = Arrays.asList(THIRD_IDENTIFIER, SECOND_IDENTIFIER);
    final FeatureDefinitionBuilder underTest = ImmutableFeatureDefinition.getBuilder(FIRST_IDENTIFIER);
    underTest.addAll(additionalIdentifiers);
    assertThat(underTest).containsExactly(FIRST_IDENTIFIER, THIRD_IDENTIFIER, SECOND_IDENTIFIER);
}