assertTrue(ArbitraryInstances.get(ImmutableSetMultimap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(MapDifference.class).areEqual());
    assertTrue(ArbitraryInstances.get(SortedMapDifference.class).areEqual());
    assertEquals(Range.all(), ArbitraryInstances.get(Range.class));
    assertTrue(ArbitraryInstances.get(NavigableSet.class).isEmpty());

  private static @Nullable Object getDefaultValue(TypeToken<?> type) {
    Class<?> rawType = type.getRawType();
    Object defaultValue = ArbitraryInstances.get(rawType);
    if (defaultValue != null) {
      return defaultValue;
    }

    // TODO(cpovirk): Support these types in ArbitraryInstances itself?
    if (rawType.equals(Predicate.class)) {
      return (Predicate<Object>) v -> (boolean) getDefaultValue(TypeToken.of(boolean.class));

    assertTrue(ArbitraryInstances.get(NavigableMap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(LinkedList.class).isEmpty());
    assertTrue(ArbitraryInstances.get(Deque.class).isEmpty());
    assertTrue(ArbitraryInstances.get(Queue.class).isEmpty());
    assertTrue(ArbitraryInstances.get(PriorityQueue.class).isEmpty());
    assertTrue(ArbitraryInstances.get(BitSet.class).isEmpty());

    T defaultValue = (T) defaultValues.getInstance(rawType);
    if (defaultValue != null) {
      return defaultValue;
    }
    @SuppressWarnings("unchecked") // ArbitraryInstances always returns generics-safe dummies.
    T value = (T) ArbitraryInstances.get(rawType);
    if (value != null) {
      return value;
    }
    if (rawType.isInterface()) {
      return new SerializableDummyProxy(this).newProxy(type);
    }

  @J2ktIncompatible
  @GwtIncompatible // reflection
  @AndroidIncompatible // TODO(cpovirk): ClassNotFoundException: com.google.common.base.Function
  // (I suspect that this and the other similar failures happen with ArbitraryInstances proxies.)
  public void testEqualsAndSerializable() throws Exception {
    new ClassSanityTester().forAllPublicStaticMethods(Functions.class).testEqualsAndSerializable();
  }

  @J2ktIncompatible

import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.common.testing.ArbitraryInstances;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import junit.framework.AssertionFailedError;

import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Lists;
import com.google.common.testing.ArbitraryInstances;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import junit.framework.AssertionFailedError;

  @J2ktIncompatible
  @GwtIncompatible // reflection
  @AndroidIncompatible // TODO(cpovirk): ClassNotFoundException: com.google.common.base.Function
  // (I suspect that this and the other similar failures happen with ArbitraryInstances proxies.)
  public void testEqualsAndSerializable() throws Exception {
    new ClassSanityTester().forAllPublicStaticMethods(Functions.class).testEqualsAndSerializable();
  }

  @J2ktIncompatible

    }
    return params;
  }

  private static final ImmutableSet<String> NOT_WORKING_ON_MOCKS =
      ImmutableSet.of("latestPermitAgeSec", "setRate", "getAvailablePermits");

  // We would use ArbitraryInstances, but it returns 0, invalid for many RateLimiter methods.
  private static final ImmutableClassToInstanceMap<Object> PARAMETER_VALUES =
      ImmutableClassToInstanceMap.builder()
          .put(int.class, 1)

    }
    return params;
  }

  private static final ImmutableSet<String> NOT_WORKING_ON_MOCKS =
      ImmutableSet.of("latestPermitAgeSec", "setRate", "getAvailablePermits");

  // We would use ArbitraryInstances, but it returns 0, invalid for many RateLimiter methods.
  private static final ImmutableClassToInstanceMap<Object> PARAMETER_VALUES =
      ImmutableClassToInstanceMap.builder()
          .put(int.class, 1)