    @Test
    public void testParsePureUnit() {

        assertThat(UnitUtils.parseUnit("DU"), is(SmartHomeUnits.DOBSON_UNIT));
        assertThat(UnitUtils.parseUnit("°F"), is(ImperialUnits.FAHRENHEIT));
        assertThat(UnitUtils.parseUnit("m"), is(SIUnits.METRE));
        assertThat(UnitUtils.parseUnit("%"), is(SmartHomeUnits.PERCENT));
    }