if (this.bytes.length != that.getBytesInternal().length) {
        return false;
      }

      boolean areEqual = true;
      for (int i = 0; i < this.bytes.length; i++) {
        areEqual &= (this.bytes[i] == that.getBytesInternal()[i]);
      }
      return areEqual;
    }

    private static final long serialVersionUID = 0;
  }

  /**

      @Override
      boolean doEquals(byte[] a, byte[] b) {
        if (a.length != b.length) {
          return false;
        }
        boolean areEqual = true;
        for (int i = 0; i < a.length; i++) {
          areEqual &= (a[i] == b[i]);
        }
        return areEqual;
      }
    },
    XORING_TO_BYTE {
      @Override
      boolean doEquals(byte[] a, byte[] b) {
        if (a.length != b.length) {

      @Override
      boolean doEquals(byte[] a, byte[] b) {
        if (a.length != b.length) {
          return false;
        }
        boolean areEqual = true;
        for (int i = 0; i < a.length; i++) {
          areEqual &= (a[i] == b[i]);
        }
        return areEqual;
      }
    },
    XORING_TO_BYTE {
      @Override
      boolean doEquals(byte[] a, byte[] b) {
        if (a.length != b.length) {

    if (this.length() != that.length()) {
      return false;
    }
    for (int i = 0; i < length(); i++) {
      if (!areEqual(this.get(i), that.get(i))) {
        return false;
      }
    }
    return true;
  }

  // Match the behavior of Double.equals()
  private static boolean areEqual(double a, double b) {
    return Double.doubleToLongBits(a) == Double.doubleToLongBits(b);
  }

  public void testMapDifferenceEmptyEmpty() {
    MapDifference<Integer, Integer> diff = Maps.difference(EMPTY, EMPTY);
    assertTrue(diff.areEqual());
    assertEquals(EMPTY, diff.entriesOnlyOnLeft());
    assertEquals(EMPTY, diff.entriesOnlyOnRight());
    assertEquals(EMPTY, diff.entriesInCommon());
    assertEquals(EMPTY, diff.entriesDiffering());

  public void testMapDifferenceEmptyEmpty() {
    MapDifference<Integer, Integer> diff = Maps.difference(EMPTY, EMPTY);
    assertTrue(diff.areEqual());
    assertEquals(EMPTY, diff.entriesOnlyOnLeft());
    assertEquals(EMPTY, diff.entriesOnlyOnRight());
    assertEquals(EMPTY, diff.entriesInCommon());
    assertEquals(EMPTY, diff.entriesDiffering());

public interface MapDifference<K extends @Nullable Object, V extends @Nullable Object> {
  /**
   * Returns {@code true} if there are no differences between the two maps; that is, if the maps are
   * equal.
   */
  boolean areEqual();

  /**
   * Returns an unmodifiable map containing the entries from the left map whose keys are not present
   * in the right map.
   */
  Map<K, V> entriesOnlyOnLeft();

  /**

    assertTrue(ArbitraryInstances.get(ImmutableSetMultimap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(MapDifference.class).areEqual());
    assertTrue(ArbitraryInstances.get(SortedMapDifference.class).areEqual());
    assertEquals(Range.all(), ArbitraryInstances.get(Range.class));
    assertTrue(ArbitraryInstances.get(NavigableSet.class).isEmpty());

    assertTrue(ArbitraryInstances.get(ImmutableSetMultimap.class).isEmpty());
    assertTrue(ArbitraryInstances.get(MapDifference.class).areEqual());
    assertTrue(ArbitraryInstances.get(SortedMapDifference.class).areEqual());
    assertEquals(Range.all(), ArbitraryInstances.get(Range.class));
    assertTrue(ArbitraryInstances.get(NavigableSet.class).isEmpty());

org.hamcrest.core; public synchronized class IsEqual extends org.hamcrest.BaseMatcher { private final Object expectedValue; public void IsEqual(Object); public boolean matches(Object); public void describeTo(org.hamcrest.Description); private static boolean areEqual(Object, Object); private static boolean areArraysEqual(Object, Object); private static boolean areArrayLengthsEqual(Object, Object); private static boolean areArrayElementsEqua(Object, Object); private static boolean isArray(Object); public static...