*/
@NullUnmarked
public final class TestingWeighers {

  /** Returns a {@link Weigher} that returns the given {@code constant} for every request. */
  static Weigher<Object, Object> constantWeigher(int constant) {
    return new ConstantWeigher(constant);
  }

  /** Returns a {@link Weigher} that uses the integer key as the weight. */
  static Weigher<Integer, Object> intKeyWeigher() {
    return new IntKeyWeigher();
  }

import static com.google.common.cache.TestingCacheLoaders.identityLoader;
import static com.google.common.cache.TestingRemovalListeners.countingRemovalListener;
import static com.google.common.cache.TestingWeighers.constantWeigher;
import static com.google.common.cache.TestingWeighers.intKeyWeigher;
import static com.google.common.cache.TestingWeighers.intValueWeigher;
import static com.google.common.truth.Truth.assertThat;

    assertThrows(IllegalStateException.class, () -> builder.build(identityLoader()));
  }

  @GwtIncompatible // weigher
  public void testWeigher_withMaximumSize() {
    assertThrows(
        IllegalStateException.class,
        () -> CacheBuilder.newBuilder().weigher(constantWeigher(42)).maximumSize(1));
    assertThrows(