@Test
void mapBoolean() {

    final ToBoolean<Boolean> toBoolean = bool -> bool;
    final ToBooleanMapper<Boolean, ToBoolean<Boolean>, BooleanUnaryOperator> toBooleanMapper =
            (ToBooleanMapper<Boolean, ToBoolean<Boolean>, BooleanUnaryOperator>)
                    MapperUtil.mapBoolean(toBoolean, bool -> bool);
    assertEquals(MapperType.BOOLEAN_TO_BOOLEAN, toBooleanMapper.mapperType());
}