    @Test
    public void testFormat() {

        assertEquals(
                SpeedFormatterUtil.format(METERS_PER_SECOND_SPEED, UnitSystem.METRIC),
                (int) KILOMETERS_PER_HOUR_SPEED);
        assertEquals(
                SpeedFormatterUtil.format(METERS_PER_SECOND_SPEED, UnitSystem.IMPERIAL_UK),
                (int) MILES_PER_HOUR_SPEED);
        assertEquals(
                SpeedFormatterUtil.format(METERS_PER_SECOND_SPEED, UnitSystem.IMPERIAL_US),
                (int) MILES_PER_HOUR_SPEED);
    }