### Question:
LengthUnitsProvider extends AbstractUnitsProvider<Length> { @Override public Class<? extends Length> getDisplayClass(Length value) { return value.getDisplayClass(); } LengthUnitsProvider(); @Override T convert(Class<T> desiredType, Length source); @Override T fromUnitsAndMagnitude(Class<T> type, Number magnitude); @Override Class<? extends Length> getDisplayClass(Length value); @Override String getLongLabel(Class<? extends Length> type, boolean plural); @Override String getSelectionLabel(Class<? extends Length> type); @Override String getShortLabel(Class<? extends Length> type, boolean plural); @Override Class<Length> getSuperType(); @Override String toShortLabelString(Length obj);  }### Answer:
@Test public void testGetDisplayClass() { LengthUnitsProvider units = new LengthUnitsProvider(); Assert.assertEquals(Meters.class, units.getDisplayClass(new AutoscaleMetric(1.))); Assert.assertEquals(Kilometers.class, units.getDisplayClass(new AutoscaleMetric(50000.))); }