bytesB[4] = (byte) 0xef;

    HashCode hashCodeA = HashCode.fromBytes(bytesA);
    HashCode hashCodeB = HashCode.fromBytes(bytesB);

    // They aren't equal...
    assertFalse(hashCodeA.equals(hashCodeB));

    // But they still have the same Object#hashCode() value.
    // Technically not a violation of the equals/hashCode contract, but...?
    assertEquals(hashCodeA.hashCode(), hashCodeB.hashCode());
  }

    Random random = new Random(7);
    List<HashCode> hashCodes = new ArrayList<>();
    for (int i = 0; i < 10; i++) {
      hashCodes.add(HashCode.fromLong(random.nextLong()));
    }
    HashCode hashCode1 = Hashing.combineOrdered(hashCodes);
    Collections.shuffle(hashCodes, random);
    HashCode hashCode2 = Hashing.combineOrdered(hashCodes);

    assertFalse(hashCode1.equals(hashCode2));
  }

    bytesB[4] = (byte) 0xef;

    HashCode hashCodeA = HashCode.fromBytes(bytesA);
    HashCode hashCodeB = HashCode.fromBytes(bytesB);

    // They aren't equal...
    assertFalse(hashCodeA.equals(hashCodeB));

    // But they still have the same Object#hashCode() value.
    // Technically not a violation of the equals/hashCode contract, but...?
    assertEquals(hashCodeA.hashCode(), hashCodeB.hashCode());
  }

    assertEquals(control("foo", 1).hashCode(), entry("foo", 1).hashCode());
    assertEquals(control("bar", 2).hashCode(), entry("bar", 2).hashCode());
  }

  public void testHashCodeNull() {
    assertEquals(control(NK, 1).hashCode(), entry(NK, 1).hashCode());
    assertEquals(control("bar", NV).hashCode(), entry("bar", NV).hashCode());
    assertEquals(control(NK, NV).hashCode(), entry(NK, NV).hashCode());
  }

    int index = 0;
    int hashCode = 0;
    long size = 0;
    for (Entry<? extends E> entryWithWildcard : entries) {
      @SuppressWarnings("unchecked") // safe because we only read from it
      Entry<E> entry = (Entry<E>) entryWithWildcard;
      E element = checkNotNull(entry.getElement());
      int count = entry.getCount();
      int hash = element.hashCode();
      int bucket = Hashing.smear(hash) & mask;

      this.delegateString = delegateString;
      this.onHashCode = onHashCode;
      this.onEquals = onEquals;
      this.onCompareTo = onCompareTo;
    }

    @Override
    public int hashCode() {
      onHashCode.run();
      return delegateString.hashCode();
    }

    @Override
    public boolean equals(@Nullable Object other) {

        // Same inputs and output should have same hash code
        assertEquals(item1.hashCode(), item2.hashCode());

        // Different inputs should have different hash code
        assertNotSame(item1.hashCode(), item3.hashCode());

        // Same inputs but different output should have different hash code
        assertNotSame(item1.hashCode(), item4.hashCode());
    }

    @Test
    public void test_hashCode_withNullOutput() {

  private final transient int hashCode;
  // the same values as `elements` in hashed positions (plus nulls)
  @VisibleForTesting final transient @Nullable Object[] table;
  // 'and' with an int to get a valid table index.
  private final transient int mask;
  private final transient int size;

  RegularImmutableSet(
      @Nullable Object[] elements, int hashCode, @Nullable Object[] table, int mask, int size) {

        // Different input should have different hashCode
        assertNotSame(item1.hashCode(), item4.hashCode());
    }

    @Test
    public void test_hashCode_withNullInput() {
        // Test hashCode with null input - should not throw, returns consistent hash for null
        StopwordsItem item1 = new StopwordsItem(1, null);
        StopwordsItem item2 = new StopwordsItem(2, null);

    }

    @Override
    public int hashCode() {
      return 0;
    }
  }

  static class SameIntegerInstance {
    private final Integer i;

    public SameIntegerInstance(Integer i) {
      this.i = checkNotNull(i);
    }

    @Override
    public int hashCode() {
      return i.hashCode();
    }

    @Override