K k = (K) key;
        return function.apply(k);
      } else {
        return null;
      }
    }

    @Override
    public void clear() {
      backingSet().clear();
    }

    @Override
    protected Set<Entry<K, V>> createEntrySet() {
      @WeakOuter
      final class EntrySetImpl extends EntrySet<K, V> {
        @Override

        K k = (K) key;
        return function.apply(k);
      } else {
        return null;
      }
    }

    @Override
    public void clear() {
      backingSet().clear();
    }

    @Override
    protected Set<Entry<K, V>> createEntrySet() {
      @WeakOuter
      final class EntrySetImpl extends EntrySet<K, V> {
        @Override

        break
      }
    }

    if (routes.isEmpty()) {
      // We've exhausted all Proxies so fallback to the postponed routes.
      routes += postponedRoutes
      postponedRoutes.clear()
    }

    return Selection(routes)
  }

  /** Prepares the proxy servers to try. */
  private fun resetNextProxy(
    url: HttpUrl,
    proxy: Proxy?,
  ) {
    fun selectProxies(): List<Proxy> {

    unfiltered.remove("three");
    assertEquals(ImmutableMap.of("two", 2, "four", 4), unfiltered);
    assertEquals(ImmutableMap.of("four", 4), filtered);

    unfiltered.clear();
    assertEquals(ImmutableMap.of(), unfiltered);
    assertEquals(ImmutableMap.of(), filtered);
  }

  public void testFilteredValuesIllegalPut() {
    Map<String, Integer> unfiltered = createUnfiltered();

    @BeforeEach
    void setUp() {
        // Save original system property
        originalSystemProperty = System.getProperty(Constants.MAVEN_LOGGER_DEFAULT_LOG_LEVEL);
        // Clear system property to test configuration file loading
        System.clearProperty(Constants.MAVEN_LOGGER_DEFAULT_LOG_LEVEL);
    }

    @AfterEach
    void tearDown() {
        // Restore original system property

        CacheRecord record = new CacheRecord(exception);

        cache.put(key, record);

        return record;
    }

    @Override
    public void flush() {
        cache.clear();
    }

    protected static int pluginHashCode(Plugin plugin) {
        return CacheUtils.pluginHashCode(plugin);
    }

    protected static boolean pluginEquals(Plugin a, Plugin b) {

    }
  }


  public void testKeySet_clear() {
    for (LoadingCache<Object, Object> cache : caches()) {
      warmUp(cache, 0, 100);

      Set<Object> keys = cache.asMap().keySet();
      keys.clear();
      checkEmpty(keys);
      checkEmpty(cache);
    }
  }

  public void testKeySet_empty_remove() {
    for (LoadingCache<Object, Object> cache : caches()) {

    }
  }


  public void testKeySet_clear() {
    for (LoadingCache<Object, Object> cache : caches()) {
      warmUp(cache, 0, 100);

      Set<Object> keys = cache.asMap().keySet();
      keys.clear();
      checkEmpty(keys);
      checkEmpty(cache);
    }
  }

  public void testKeySet_empty_remove() {
    for (LoadingCache<Object, Object> cache : caches()) {

  Collection<V> unmodifiableEmptyCollection() {
    if (unfiltered instanceof SetMultimap) {
      return emptySet();
    } else {
      return emptyList();
    }
  }

  @Override
  public void clear() {
    keySet().clear();
  }

  @Override
  Set<K> createKeySet() {
    return Sets.filter(unfiltered.keySet(), keyPredicate);
  }

  @Override
  public Collection<V> get(@ParametricNullness K key) {

      size -= oldCount;
    } else {
      backingMap.setValue(entryIndex, newCount);
      size += newCount - oldCount;
    }
    return true;
  }

  @Override
  public final void clear() {
    backingMap.clear();
    size = 0;
  }

  /**
   * Skeleton of per-entry iterators. We could push this down and win a few bytes, but it's complex
   * enough it's not especially worth it.
   */