@Test
void mapFloatToDouble() {

    final ToFloat<Float> toFloat = f -> f;
    final ToDoubleMapper<Float, ToFloat<Float>, FloatToDoubleFunction> toDoubleMapper =
            (ToDoubleMapper<Float, ToFloat<Float>, FloatToDoubleFunction>)
                    MapperUtil.mapFloatToDouble(toFloat, f -> 1);
    assertEquals(MapperType.FLOAT_TO_DOUBLE, toDoubleMapper.mapperType());
}