return backingSet().contains(key);
    }

    @Override
    public @Nullable V get(@Nullable Object key) {
      return getOrDefault(key, null);
    }

    @Override
    public @Nullable V getOrDefault(@Nullable Object key, @Nullable V defaultValue) {
      if (Collections2.safeContains(backingSet(), key)) {
        @SuppressWarnings("unchecked") // unsafe, but Javadoc warns about it

          }
        });
    assertEquals(oldName, Thread.currentThread().getName());
  }

  public void testExecutors_nullCheck() throws Exception {
    new ClassSanityTester()
        .setDefault(RateLimiter.class, RateLimiter.create(1.0))
        .forAllPublicStaticMethods(MoreExecutors.class)
        .thatReturn(Executor.class)
        .testNulls();
  }

  @SuppressWarnings("TruthGetOrDefault") // We are testing our implementation of getOrDefault.
  public void testGetOrDefault() {
    LocalCache<Object, Object> map =
        makeLocalCache(createCacheBuilder().concurrencyLevel(1).initialCapacity(1));
    map.put(1, 1);
    assertThat(map.getOrDefault(1, 2)).isEqualTo(1);
    assertThat(map.getOrDefault(2, 2)).isEqualTo(2);
  }

  public void testPutCausesExpansion() {

  @SuppressWarnings("TruthGetOrDefault") // We are testing our implementation of getOrDefault.
  public void testGetOrDefault() {
    LocalCache<Object, Object> map =
        makeLocalCache(createCacheBuilder().concurrencyLevel(1).initialCapacity(1));
    map.put(1, 1);
    assertThat(map.getOrDefault(1, 2)).isEqualTo(1);
    assertThat(map.getOrDefault(2, 2)).isEqualTo(2);
  }

  public void testPutCausesExpansion() {

      mediaType.parsedCharset = this.parsedCharset;
    }
    // Return one of the constants if the media type is a known type.
    @SuppressWarnings("GetOrDefaultNotNull") // getOrDefault requires API Level 24
    MediaType result = firstNonNull(knownTypes.get(mediaType), mediaType);
    return result;
  }

  /**

    assertThat(tester.instantiate(MyAnnotation.class)).isNull();
  }

  public void testInstantiate_setDefault() throws Exception {
    NotInstantiable x = new NotInstantiable();
    tester.setDefault(NotInstantiable.class, x);
    assertThat(tester.instantiate(ConstructorParameterNotInstantiable.class)).isNotNull();
  }

  public void testSetDistinctValues_equalInstances() {
    assertThrows(

      }
      return // Already started.
    }

    var boundSocketAddress = socketAddress
    try {
      val serverSocketFactory =
        serverSocketFactory_
          ?: (ServerSocketFactory.getDefault()!!.also { this.serverSocketFactory_ = it })

      val serverSocket =
        serverSocketFactory
          .createServerSocket()!!
          .also { this.serverSocket = it }

      synchronized (mutex) {
        return delegate().get(key);
      }
    }

    @Override
    public @Nullable V getOrDefault(@Nullable Object key, @Nullable V defaultValue) {
      synchronized (mutex) {
        return delegate().getOrDefault(key, defaultValue);
      }
    }

    @Override
    public boolean isEmpty() {
      synchronized (mutex) {

      return this.getClass().getSimpleName() + "[" + index + "]";
    }
  }

  public void testNulls() {
    ServiceManager manager = new ServiceManager(Arrays.asList());
    new NullPointerTester()
        .setDefault(ServiceManager.Listener.class, new RecordingListener())
        .testAllPublicInstanceMethods(manager);
  }

  private static final class RecordingListener extends ServiceManager.Listener {

  }

  @J2ktIncompatible
  @GwtIncompatible // NullPointerTester
  public void testNullPointers() {
    NullPointerTester tester = new NullPointerTester();
    tester.setDefault(double.class, 3.0);
    tester.testAllPublicStaticMethods(DoubleMath.class);
  }