### Question:
MetadataObjectContainer implements Serializable { public boolean isEmpty() { return objects.isEmpty(); }  @Nonnull List<T> getObjects(); boolean addObject( @Nonnull T metadata ); void addObjects( @Nonnull Collection<? extends T> metadata ); boolean isEmpty();  }### Answer:
@Test public void empty() { final MetadataObjectContainer container = new MetadataObjectContainer(); Assert.assertTrue( container.isEmpty() ); }