private final T reference;

  Present(T reference) {
    this.reference = reference;
  }

  @Override
  public boolean isPresent() {
    return true;
  }

  @Override
  public T get() {
    return reference;
  }

  @Override
  public T or(T defaultValue) {
    checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)");
    return reference;
  }

  @Override

			},
		},
	}

	for _, testCase := range testCases {
		t.Run(testCase.name, func(t *testing.T) {
			rec := httptest.NewRecorder()
			req := httptest.NewRequest("GET", "/test", nil)
			req.Header = testCase.headers

			opts, _ := getAndValidateAttributesOpts(ctx, rec, req, bucket, "testobject")

			if !reflect.DeepEqual(opts.ObjectAttributes, testCase.wantObjectAttrs) {

	// Add some files to the archive.
	var files = []struct {
		Name, Body string
	}{
		{"readme.txt", "This archive contains some text files."},
		{"gopher.txt", "Gopher names:\nGeorge\nGeoffrey\nGonzo"},
		{"todo.txt", "Get animal handling licence.\nWrite more examples."},
	}
	for _, file := range files {
		f, err := w.Create(file.Name)
		if err != nil {
			log.Fatal(err)
		}
		_, err = f.Write([]byte(file.Body))
		if err != nil {

            return parent.retainAll(c);
        }

        @Override
        public void clear() {
            parent.clear();
        }

        @Override
        public E get(final int index) {
            return parent.get(index);
        }

        @Override
        public E set(final int index, final E element) {
            return parent.set(index, element);
        }

        @Override

    for (K k : multimap().keySet()) {
      assertTrue(multimap().containsKey(k));
    }
  }

  public void testContainsKeyAgreesWithGet() {
    for (K k : sampleKeys()) {
      assertEquals(!multimap().get(k).isEmpty(), multimap().containsKey(k));
    }
  }

  public void testContainsKeyAgreesWithAsMap() {
    for (K k : sampleKeys()) {
      assertEquals(multimap().containsKey(k), multimap().asMap().containsKey(k));

    assertThat(multimap.keySet()).containsExactly("a", "b", "c").inOrder();
    assertThat(multimap.values()).containsExactly(1, 3, 2, 4).inOrder();
    assertThat(multimap.get("a")).containsExactly(1, 3).inOrder();
    assertThat(multimap.get("b")).containsExactly(2);
    assertThat(multimap.get("c")).containsExactly(4);
  }

  public void testEmptyMultimapReads() {
    ImmutableListMultimap<String, Integer> multimap = ImmutableListMultimap.of();

            credentials.setType(CredentialsType.NTLM);
            final Map<String, String> parameterMap = ParameterUtil.parse(getParameters());
            credentials.setDomain(parameterMap.get("domain"));
            credentials.setWorkstation(parameterMap.get("workstation"));
        }
        config.setCredentials(credentials);

        return config;
    }

    public WebConfig getWebConfig() {
        if (webConfig == null) {

    Predicate<Throwable> predicate = INSTANCE_OF.get(expectedThrowable);
    if (predicate == null) {
      throw new IllegalArgumentException(
          expectedThrowable
              + " is not yet supported by ReflectionFreeAssertThrows. Add an entry for it in the"
              + " map in that class.");
    }
    Object result;
    try {
      result = supplier.get();
    } catch (Throwable t) {

    Predicate<Throwable> predicate = INSTANCE_OF.get(expectedThrowable);
    if (predicate == null) {
      throw new IllegalArgumentException(
          expectedThrowable
              + " is not yet supported by ReflectionFreeAssertThrows. Add an entry for it in the"
              + " map in that class.");
    }
    Object result;
    try {
      result = supplier.get();
    } catch (Throwable t) {

    Predicate<Throwable> predicate = INSTANCE_OF.get(expectedThrowable);
    if (predicate == null) {
      throw new IllegalArgumentException(
          expectedThrowable
              + " is not yet supported by ReflectionFreeAssertThrows. Add an entry for it in the"
              + " map in that class.");
    }
    Object result;
    try {
      result = supplier.get();
    } catch (Throwable t) {