assertEquals(new CacheStats(0, 0, 0, 0, 0, 0), one.minus(two));
  }

  public void testPlus() {
    CacheStats one = new CacheStats(11, 13, 15, 13, 11, 9);
    CacheStats two = new CacheStats(53, 47, 41, 39, 37, 35);

    CacheStats sum = two.plus(one);
    assertEquals(124, sum.requestCount());
    assertEquals(64, sum.hitCount());
    assertEquals(64.0 / 124, sum.hitRate());
    assertEquals(60, sum.missCount());

        ImmutableMap.of(
            new IntegerDiv10(3), "three",
            new IntegerDiv10(20), "twenty",
            new IntegerDiv10(11), "eleven",
            new IntegerDiv10(35), "thirty five",
            new IntegerDiv10(12), "twelve");

    try {
      ImmutableSortedMap.copyOf(original);
      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {

        ImmutableMap.of(
            new IntegerDiv10(3), "three",
            new IntegerDiv10(20), "twenty",
            new IntegerDiv10(11), "eleven",
            new IntegerDiv10(35), "thirty five",
            new IntegerDiv10(12), "twelve");

    try {
      ImmutableSortedMap.copyOf(original);
      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {

    assertEquals(new CacheStats(0, 0, 0, 0, 0, 0), one.minus(two));
  }

  public void testPlus() {
    CacheStats one = new CacheStats(11, 13, 15, 13, 11, 9);
    CacheStats two = new CacheStats(53, 47, 41, 39, 37, 35);

    CacheStats sum = two.plus(one);
    assertEquals(124, sum.requestCount());
    assertEquals(64, sum.hitCount());
    assertEquals(64.0 / 124, sum.hitRate());
    assertEquals(60, sum.missCount());

    Integer.MAX_VALUE,
    Integer.MAX_VALUE,
    65536,
    2345,
    477,
    193,
    110,
    75,
    58,
    49,
    43,
    39,
    37,
    35,
    34,
    34,
    33
  };

  /**
   * Returns the arithmetic mean of {@code x} and {@code y}, rounded towards negative infinity. This
   * method is overflow resilient.
   *
   * @since 14.0

            3627, 1093, 25105, 12524, 12367, 3605, 945, 20998, 20250, 12489, 26412, 12501, 183,
            23398, 12467, 22269, 29983, 1601, 273, 3021, 8220, 8221, 20316, 1602, 1603, 35, 25991,
            12472, 20102, 12513, 64, 3632, 12354, 12502, 12365, 22320, 20986, 34892, 23376, 32593,
            51060, 21457, 12459, 21517, 8230, 2381, 19979, 1497, 12384, 2352, 1493, 36, 1078, 12486,

            3627, 1093, 25105, 12524, 12367, 3605, 945, 20998, 20250, 12489, 26412, 12501, 183,
            23398, 12467, 22269, 29983, 1601, 273, 3021, 8220, 8221, 20316, 1602, 1603, 35, 25991,
            12472, 20102, 12513, 64, 3632, 12354, 12502, 12365, 22320, 20986, 34892, 23376, 32593,
            51060, 21457, 12459, 21517, 8230, 2381, 19979, 1497, 12384, 2352, 1493, 36, 1078, 12486,