### Question:
AbstractRegistry implements Registry<K, V> { @Override public V lookup(K name) { return storage.get(name); }  @Override V lookup(K name); @Override void bind(K name, V value); @Override void unbind(K name); @Override Set<K> listBound();  }### Answer:
@Test public void lookupNotBound() { final String result = registry.lookup(KEY); assertNull("Expectected value not to be bound", result); }