async.cancel(true);
    assertTrue(inner.isCancelled());
    assertTrue(inner.wasInterrupted());
    assertThrows(CancellationException.class, inner::get);
  }

  public void testCancel_resultCancelsInner() throws Exception {
    SettableFuture<Object> async = SettableFuture.create();
    SettableFuture<Object> inner = SettableFuture.create();
    async.setFuture(inner);
    async.cancel(false);

    async.cancel(true);
    assertTrue(inner.isCancelled());
    assertTrue(inner.wasInterrupted());
    assertThrows(CancellationException.class, inner::get);
  }

  public void testCancel_resultCancelsInner() throws Exception {
    SettableFuture<Object> async = SettableFuture.create();
    SettableFuture<Object> inner = SettableFuture.create();
    async.setFuture(inner);
    async.cancel(false);

    assertThat(toTest).isEqualTo("FooBar{}");
  }

  @GwtIncompatible // Class names are obfuscated in GWT
  public void testToStringHelper_localInnerClass() {
    // Local inner classes have names ending like "Outer.$1Inner"
    class LocalInnerClass {}
    String toTest = MoreObjects.toStringHelper(new LocalInnerClass()).toString();
    assertThat(toTest).isEqualTo("LocalInnerClass{}");
  }

    @SuppressWarnings("unchecked")
    NavigableMap<K, V> innermost =
        new SafeTreeMap<>((Comparator<? super K>) Ordering.natural().nullsFirst());
    TestMap<K, V> inner = new TestMap<>(innermost, mutex);
    NavigableMap<K, V> outer = Synchronized.navigableMap(inner, mutex);
    return outer;
  }

  static class TestEntry<K, V> extends ForwardingMapEntry<K, V> implements Serializable {
    private final Entry<K, V> delegate;

public class SynchronizedMapTest extends TestCase {
  public final Object mutex = new Object[0]; // something Serializable

  protected <K, V> Map<K, V> create() {
    TestMap<K, V> inner = new TestMap<>(new HashMap<K, V>(), mutex);
    Map<K, V> outer = Synchronized.map(inner, mutex);
    return outer;
  }

  static class TestMap<K, V> extends ForwardingMap<K, V> implements Serializable {
    public final Object mutex;

public class SynchronizedMapTest extends TestCase {
  public final Object mutex = new Object[0]; // something Serializable

  protected <K, V> Map<K, V> create() {
    TestMap<K, V> inner = new TestMap<>(new HashMap<K, V>(), mutex);
    Map<K, V> outer = Synchronized.map(inner, mutex);
    return outer;
  }

  static class TestMap<K, V> extends ForwardingMap<K, V> implements Serializable {
    public final Object mutex;

        assertEquals(228L, MemoryUtil.sizeOf(mixedMap));

        // Nested maps
        Map<String, Map<String, String>> nestedMap = new HashMap<>();
        nestedMap.put("outer", Maps.map("inner", "value").$());
        assertEquals(183L, MemoryUtil.sizeOf(nestedMap));
    }

    @Test
    public void test_sizeOf_customObjects() {
        // Test fallback case for custom objects (should return 16L)

                .expiry(0) // Should not change
                .expiry(3000L);

        assertSame(purgeThumbnailJob, result);
        assertEquals(3000L, purgeThumbnailJob.getExpiry());
    }

    // Inner class for mock ThumbnailManager
    private static class MockThumbnailManager extends ThumbnailManager {
        private long purgeCallCount = 0;
        private long purgeExpiry = 0;

        public Class<?> getLastCredentialType() {
            return lastCredentialType;
        }

        public Function<?, ?> getLastFunction() {
            return lastFunction;
        }
    }

    // Inner class for test credential
    private static class TestLoginCredential implements LoginCredential {
        private final String username;
        private final String password;

        final Map<String, Object> source = new LinkedHashMap<>();
        final Map<String, Object> inner = new LinkedHashMap<>();
        inner.put("key", "value");
        final Map<String, Object> outer = new LinkedHashMap<>();
        outer.put("inner", inner);
        source.put("nested", outer);

        final String json = new JsonIndexExportFormatter().format(source, Collections.emptySet());