@Test
 public void should_return_values_of_property() {
   List<Long> ids = new ArrayList<Long>();
   ids.add(yoda.getId());
   when(propertySupport.propertyValues(propertyName, Long.class, employees)).thenReturn(ids);
   assertSame(ids, properties.from(employees));
 }
 @Before
 public void setUp() {
   propertySupport = mock(PropertySupport.class);
   propertyName = "id";
   properties = new Properties<Long>(propertyName, Long.class);
   properties.propertySupport = propertySupport;
 }