public void testCartesianProduct_binary0x0() {
    Set<Integer> mt = emptySet();
    assertEmpty(Sets.cartesianProduct(mt, mt));
  }

  public void testCartesianProduct_binary0x1() {
    Set<Integer> mt = emptySet();
    assertEmpty(Sets.cartesianProduct(mt, set(1)));
  }

  public void testCartesianProduct_binary1x0() {
    Set<Integer> mt = emptySet();
    assertEmpty(Sets.cartesianProduct(set(1), mt));
  }

  @GwtIncompatible // Only used by @GwtIncompatible code
  private abstract static class EmptyIteratorTester extends IteratorTester<Integer> {
    protected EmptyIteratorTester() {
      super(3, MODIFIABLE, Collections.<Integer>emptySet(), IteratorTester.KnownOrder.KNOWN_ORDER);
    }
  }

  @GwtIncompatible // Only used by @GwtIncompatible code
  private abstract static class SingletonIteratorTester extends IteratorTester<Integer> {

  @GwtIncompatible // Only used by @GwtIncompatible code
  private abstract static class EmptyIteratorTester extends IteratorTester<Integer> {
    protected EmptyIteratorTester() {
      super(3, MODIFIABLE, Collections.<Integer>emptySet(), IteratorTester.KnownOrder.KNOWN_ORDER);
    }
  }

  @GwtIncompatible // Only used by @GwtIncompatible code
  private abstract static class SingletonIteratorTester extends IteratorTester<Integer> {

        val firDeclaration = declarationToVisit.getCorrespondingFirElement() ?: return ShortenCommandImpl(
            @Suppress("DEPRECATION")
            file.createSmartPointer(),
            importsToAdd = emptySet(),
            starImportsToAdd = emptySet(),
            listOfTypeToShortenInfo = emptyList(),
            listOfQualifierToShortenInfo = emptyList(),
            thisLabelsToShorten = emptyList(),

      new ImmutableSortedMap<>(
          ImmutableSortedSet.emptySet(Ordering.natural()), ImmutableList.<Object>of());

  static <K, V> ImmutableSortedMap<K, V> emptyMap(Comparator<? super K> comparator) {
    if (Ordering.natural().equals(comparator)) {
      return of();
    } else {
      return new ImmutableSortedMap<>(
          ImmutableSortedSet.emptySet(comparator), ImmutableList.<V>of());
    }
  }

  /**

      new ImmutableSortedMap<>(
          ImmutableSortedSet.emptySet(Ordering.natural()), ImmutableList.<Object>of());

  static <K, V> ImmutableSortedMap<K, V> emptyMap(Comparator<? super K> comparator) {
    if (Ordering.natural().equals(comparator)) {
      return of();
    } else {
      return new ImmutableSortedMap<>(
          ImmutableSortedSet.emptySet(comparator), ImmutableList.<V>of());
    }
  }

  /**

    }


    <T extends CommonServerMessageBlockResponse> T send ( CommonServerMessageBlockRequest request, T response ) throws CIFSException {
        return send(request, response, Collections.<RequestParam> emptySet());
    }


    <T extends CommonServerMessageBlockResponse> T send ( CommonServerMessageBlockRequest request, T response, Set<RequestParam> params )
            throws CIFSException {

     * @param artifacts The set of artifacts, may be {@code null}.
     */
    public void setResolvedArtifacts(Set<Artifact> artifacts) {
        this.resolvedArtifacts = (artifacts != null) ? artifacts : Collections.<Artifact>emptySet();
        this.artifacts = null;
        this.artifactMap = null;
    }

    /**
     * Sets the scope filter to select the artifacts being exposed to the currently executed mojo.

    }


    <T extends CommonServerMessageBlockResponse> T send ( CommonServerMessageBlockRequest request, T response ) throws SmbException {
        return send(request, response, Collections.<RequestParam> emptySet());
    }


    <T extends CommonServerMessageBlockResponse> T send ( CommonServerMessageBlockRequest request, T response, Set<RequestParam> params )
            throws SmbException {

   * | `http://host/?a=apple&b`          | `["a", "b"]`            |
   */
  @get:JvmName("queryParameterNames")
  val queryParameterNames: Set<String>
    get() {
      if (queryNamesAndValues == null) return emptySet()
      val result = LinkedHashSet<String>()
      for (i in 0 until queryNamesAndValues.size step 2) {
        result.add(queryNamesAndValues[i]!!)
      }
      return result.readOnly()
    }

  /**