### Question:
ConfigValueMapView extends AbstractMap<String, String> { @Override public boolean isEmpty() { return delegate.isEmpty(); } ConfigValueMapView(final Map<String, ConfigValue> delegate); @Override int size(); @Override boolean isEmpty(); @Override boolean containsKey(final Object key); @Override boolean containsValue(final Object value); @Override String get(final Object key); @Override Set<String> keySet(); @Override Set<Map.Entry<String, String>> entrySet(); @Override Collection<String> values();  }### Answer:
@Test public void isEmpty() { assertTrue(new ConfigValueMapView(new HashMap<>()).isEmpty()); }