virtual std::vector<tensorflow::Device*> ListAllTfDevices() = 0;

  //===--------------------------------------------------------------------===//
  // Following are helper functions to assist integrating TFRT with current
  // TF eager runtime.
  // TODO(b/172877902): These helper functions are currently used to support
  // PyFuncOp on TFRT, and might be useful for ops that directly use low

    return new MapTestSuiteBuilder<K, V>().usingGenerator(generator);
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    return Arrays.asList(
        MapClearTester.class,
        MapContainsKeyTester.class,
        MapContainsValueTester.class,
        MapCreationTester.class,
        MapEntrySetTester.class,
        MapEqualsTester.class,

            InputLocationTracker tracker,
            String... validValues) {
        if (string == null || string.length() <= 0) {
            return true;
        }

        List<String> values = Arrays.asList(validValues);

        if (values.contains(string)) {
            return true;
        }

        addViolation(
                problems,
                severity,
                version,

  @GwtIncompatible // NavigableSet
  @Override
  public UnmodifiableIterator<E> descendingIterator() {
    return elements.reverse().iterator();
  }

  @Override
  public Spliterator<E> spliterator() {
    return asList().spliterator();
  }

  @Override
  public void forEach(Consumer<? super E> action) {
    elements.forEach(action);
  }

  @Override
  public int size() {
    return elements.size();
  }

     */
    private static class StringItem implements Item {
        private static final List<String> QUALIFIERS =
                Arrays.asList("alpha", "beta", "milestone", "rc", "snapshot", "", "sp");
        private static final List<String> RELEASE_QUALIFIERS = Arrays.asList("ga", "final", "release");

        private static final Properties ALIASES = new Properties();

        static {
            ALIASES.put("cr", "rc");

                CollectionFeature.ALLOWS_NULL_QUERIES)
            .createTestSuite());

    suite.addTest(
        ListTestSuiteBuilder.using(new ImmutableSetAsListGenerator())
            .named("ImmutableSet.asList")
            .withFeatures(
                CollectionSize.ANY,
                CollectionFeature.REJECTS_DUPLICATES_AT_CREATION,
                CollectionFeature.SERIALIZABLE,

        return redirect(getClass());
    }

    // ===================================================================================
    //                                                                        Assist Logic
    //                                                                        ============
    private static OptionalEntity<BadWord> getEntity(final CreateForm form, final String username, final long currentTime) {

    } else {
      assertThat(defaultComparator).isEqualTo(UnsignedBytes.lexicographicalComparatorJavaImpl());
    }
  }

  public void testLexicographicalComparator() {
    List<byte[]> ordered =
        Arrays.asList(
            new byte[] {},
            new byte[] {LEAST},
            new byte[] {LEAST, LEAST},
            new byte[] {LEAST, (byte) 1},
            new byte[] {(byte) 1},

    assertThat(typeArgs).hasLength(1);
    TypeVariable<?> captured = (TypeVariable<?>) typeArgs[0];
    assertThat(captured.getBounds()).asList().contains(Number.class);
    assertThat(captured.getBounds())
        .asList()
        .containsNoneOf(Object.class, new TypeToken<Iterable<Number>>() {}.getType());
    assertThat(new TypeToken<List<? extends Number>>() {}.isSupertypeOf(fieldType)).isTrue();

        assertTrue(result.isPresent());
        assertEquals(testValue, result.get());
    }

    @Test
    public void test_ofNullable_withList() {
        List<String> testValue = Arrays.asList("item1", "item2", "item3");
        OptionalEntity<List<String>> result = OptionalUtil.ofNullable(testValue);

        assertNotNull(result);
        assertTrue(result.isPresent());