@Test
void mapByteToDouble() {

    final ToByte<Byte> toByte = b -> b;
    final ToDoubleMapper<Byte, ToByte<Byte>, ByteToDoubleFunction> toDoubleMapper =
            (ToDoubleMapper<Byte, ToByte<Byte>, ByteToDoubleFunction>)
                    MapperUtil.mapByteToDouble(toByte, b -> 1);
    assertEquals(MapperType.BYTE_TO_DOUBLE, toDoubleMapper.mapperType());
}