ImmutableSetMultimap(
      ImmutableMap<K, ImmutableSet<V>> map,
      int size,
      @Nullable Comparator<? super V> valueComparator) {
    super(map, size);
    this.emptySet = emptySet(valueComparator);
  }

  // views

  /**
   * Returns an immutable set of the values for the given key. If no mappings in the multimap have

  protected abstract <E extends Comparable<? super E>> Set<E> copyOf(
      Iterator<? extends E> elements);

  public void testCreation_noArgs() {
    Set<String> set = of();
    assertEquals(Collections.<String>emptySet(), set);
    assertThat(set).isSameInstanceAs(this.<String>of());
  }

  public void testCreation_oneElement() {
    Set<String> set = of("a");
    assertEquals(singleton("a"), set);
  }

  ImmutableSetMultimap(
      ImmutableMap<K, ImmutableSet<V>> map,
      int size,
      @Nullable Comparator<? super V> valueComparator) {
    super(map, size);
    this.emptySet = emptySet(valueComparator);
  }

  // views

  /**
   * Returns an immutable set of the values for the given key. If no mappings in the multimap have

    assertThrows(IllegalStateException.class, iterable::iterator);
  }

  public void testFrom_empty() {
    Iterable<String> iterable = MinimalIterable.from(Collections.<String>emptySet());
    Iterator<String> iterator = iterable.iterator();
    assertFalse(iterator.hasNext());
    assertThrows(NoSuchElementException.class, iterator::next);
    assertThrows(IllegalStateException.class, iterable::iterator);

    assertThrows(IllegalStateException.class, iterable::iterator);
  }

  public void testFrom_empty() {
    Iterable<String> iterable = MinimalIterable.from(Collections.<String>emptySet());
    Iterator<String> iterator = iterable.iterator();
    assertFalse(iterator.hasNext());
    assertThrows(NoSuchElementException.class, iterator::next);
    assertThrows(IllegalStateException.class, iterable::iterator);

  }

  public void testIntersection_empty() {
    ContiguousSet<Integer> set = ContiguousSet.closed(1, 3);
    ContiguousSet<Integer> emptySet = ContiguousSet.closedOpen(2, 2);
    assertEquals(ImmutableSet.of(), set.intersection(emptySet));
    assertEquals(ImmutableSet.of(), emptySet.intersection(set));
    assertEquals(
        ImmutableSet.of(),
        ContiguousSet.create(Range.closed(-5, -1), integers())

  }

  public void testIntersection_empty() {
    ContiguousSet<Integer> set = ContiguousSet.closed(1, 3);
    ContiguousSet<Integer> emptySet = ContiguousSet.closedOpen(2, 2);
    assertEquals(ImmutableSet.of(), set.intersection(emptySet));
    assertEquals(ImmutableSet.of(), emptySet.intersection(set));
    assertEquals(
        ImmutableSet.of(),
        ContiguousSet.create(Range.closed(-5, -1), integers())

  private static final long RANDOM_SEED = 177L;

  public void testCombineOrdered_empty() {
    assertThrows(
        IllegalArgumentException.class,
        () -> Hashing.combineOrdered(Collections.<HashCode>emptySet()));
  }

  public void testCombineOrdered_differentBitLengths() {
    assertThrows(
        IllegalArgumentException.class,
        () -> {
          HashCode unused =

    assertTrue(multimap.entries().isEmpty());
    assertTrue(multimap.equals(HashMultimap.create()));
    assertEquals(emptySet(), multimap.get("foo"));
    assertEquals(0, multimap.hashCode());
    assertTrue(multimap.isEmpty());
    assertEquals(HashMultiset.create(), multimap.keys());
    assertEquals(emptySet(), multimap.keySet());
    assertEquals(0, multimap.size());
    assertTrue(multimap.values().isEmpty());

    fun add(key: K, value: V) =
        map.computeIfAbsent(key, { _ -> ConcurrentHashMap.newKeySet() }).add(value)

    fun getOrEmpty(key: K): Set<V> = map[key] ?: emptySet()
}

abstract class TestFilesCleanupService @Inject constructor(
    private val fileSystemOperations: FileSystemOperations,
) : BuildService<TestFilesCleanupService.Params>, AutoCloseable, OperationCompletionListener {