assertThat("localhost".toCanonicalHost()).isEqualTo("localhost")
    assertThat("☃.net".toCanonicalHost()).isEqualTo("xn--n3h.net")

    // IPv4 Compatible or Mapped addresses
    assertThat("::192.168.0.1".toCanonicalHost()).isEqualTo("::c0a8:1")
    assertThat("::FFFF:192.168.0.1".toCanonicalHost()).isEqualTo("192.168.0.1")

    @Test
    public void test_instanceFieldsInitialization() {
        // Test that instance fields are properly initialized
        assertNotNull(crawlerEngineClient);
        // The actual client initialization happens lazily when needed
    }

    // Test that close method exists (inherited)
    @Test
    public void test_closeMethodExists() {
        // Test that close method is available (inherited from parent)

   * the result of applying {@code countFunction} to the inputs.
   *
   * <p>If the mapped elements contain duplicates (according to {@link Object#equals}), the first
   * occurrence in encounter order appears in the resulting multiset, with count equal to the sum of
   * the outputs of {@code countFunction.applyAsInt(t)} for each {@code t} mapped to that element.
   *
   * @since 22.0
   */
  public static <T extends @Nullable Object, E>

                getKeyForNullValue(),
                v3(),
                (oldV, newV) -> {
                  throw new AssertionFailedError(
                      "Should not call merge function if key was mapped to null");
                }));
    expectReplacement(entry(getKeyForNullValue(), v3()));
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_KEYS})
  public void testMergeAbsentNullKey() {
    assertEquals(

        assertEquals(58L, MemoryUtil.sizeOf("こん"));

        // Very long string
        StringBuilder longString = new StringBuilder();
        for (int i = 0; i < 1000; i++) {
            longString.append("x");
        }
        assertEquals(1056L, MemoryUtil.sizeOf(longString.toString()));
    }

    @Test
    public void test_sizeOf_numberTypes() {
        // Test various Number subclasses

        // Test with very large strings
        StringBuilder largeString = new StringBuilder();
        for (int i = 0; i < 10000; i++) {
            largeString.append("x");
        }
        OptionalEntity<String> largeStringOpt = OptionalUtil.ofNullable(largeString.toString());
        assertTrue(largeStringOpt.isPresent());
        assertEquals(10000, largeStringOpt.get().length());

    // If the class is accessible to the system ClassLoader (ClassLoader.getSystemClassLoader())
    // then FRQ does not bother to load Finalizer.class through a separate ClassLoader. That happens
    // in our test environment, which foils the purpose of this test, so we disable the logic for
    // our test by setting a static field. We are changing the field in the parallel version of FRQ

    // - even for the JVM in our open-source release (https://github.com/google/guava/issues/3147)
    // If anyone in our monorepo uses the Android copy of Guava on a JVM, that would be unfortunate.
    // But that is only likely to happen in Robolectric tests, where the risks of JDK regex are low.
    return new JdkPatternCompiler();
  }

  private static final class JdkPatternCompiler implements PatternCompiler {
    @Override

      cp >>>= 4;
      dest[4] = upperHexDigits[0x8 | (cp & 0x3)];
      cp >>>= 2;
      dest[2] = upperHexDigits[cp & 0x7];
      return dest;
    } else {
      // If this ever happens it is due to bug in UnicodeEscaper, not bad input.
      throw new IllegalArgumentException("Invalid unicode character value " + cp);
    }
  }

  private interface ChainingCalls {
    // A method that is defined to 'return this'
    @CanIgnoreReturnValue
    ChainingCalls chainingCall();

    // A method that just happens to return a ChainingCalls object
    ChainingCalls nonChainingCall();
  }

  private static final class ForwardingChainingCalls implements ChainingCalls {
    final ChainingCalls delegate;