}
  }

  public void testPutIfAbsent() {
    TestMap map = new TestMap();
    map.put("foo", 1);
    assertEquals(Integer.valueOf(1), map.putIfAbsent("foo", 2));
    assertEquals(Integer.valueOf(1), map.get("foo"));
    assertNull(map.putIfAbsent("bar", 3));
    assertEquals(Integer.valueOf(3), map.get("bar"));
  }

  public void testRemove() {
    TestMap map = new TestMap();
    map.put("foo", 1);

   * `new Integer` (as we do) instead of `Integer.valueOf`. However, under J2KT, `new Integer`
   * gets translated back to `Integer.valueOf` because that is the only thing J2KT can support. And
   * anyway, it's nice to avoid `Integer.valueOf` because the Android toolchain optimizes multiple
   * `Integer.valueOf` calls into one! So we stick with the deprecated `Integer` constructor.
   */

      String str = String.valueOf(c);
      assertEquals(str, c, Ascii.toLowerCase(c));
      assertEquals(str, c, Ascii.toUpperCase(c));
      assertFalse(str, Ascii.isLowerCase(c));
      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsLower() {
    for (char c : LOWER.toCharArray()) {
      String str = String.valueOf(c);
      assertTrue(str, c == Ascii.toLowerCase(c));

    assertEquals(Integer.valueOf(3), cache.getUnchecked(2));
    expectedReloads++;
    assertEquals(expectedLoads, loader.getLoadCount());
    assertEquals(expectedReloads, loader.getReloadCount());

    ticker.advance(1, MILLISECONDS);
    assertEquals(Integer.valueOf(1), cache.getUnchecked(0));
    assertEquals(Integer.valueOf(-1), cache.getUnchecked(1));
    assertEquals(Integer.valueOf(3), cache.getUnchecked(2));

    for (int a : TEST_INTS) {
      long value = a & 0xffffffffL;
      equalsTester.addEqualityGroup(
          UnsignedInteger.fromIntBits(a),
          UnsignedInteger.valueOf(value),
          UnsignedInteger.valueOf(Long.toString(value)),
          UnsignedInteger.valueOf(Long.toString(value, 16), 16));
    }
    equalsTester.testEquals();
  }

  public void testIntValue() {
    for (int a : TEST_INTS) {

    assertThrows(
        UnsupportedOperationException.class,
        () -> map.put(TypeToken.of(Integer.class), Integer.valueOf(5)));
  }

  public void testPutAllThrows() {
    assertThrows(
        UnsupportedOperationException.class,
        () -> map.putAll(ImmutableMap.of(TypeToken.of(Integer.class), Integer.valueOf(5))));
  }

  public void testEntrySetMutationThrows() {
    map.putInstance(String.class, "test");

      new Converter<String, Long>() {
        @Override
        protected Long doForward(String object) {
          return Long.valueOf(object);
        }

        @Override
        protected String doBackward(Long object) {
          return String.valueOf(object);
        }

        @Override
        public String toString() {
          return "string2long";
        }
      };

    assertEquals(Integer.valueOf(3), cache.getUnchecked(2));
    expectedReloads++;
    assertEquals(expectedLoads, loader.getLoadCount());
    assertEquals(expectedReloads, loader.getReloadCount());

    ticker.advance(1, MILLISECONDS);
    assertEquals(Integer.valueOf(1), cache.getUnchecked(0));
    assertEquals(Integer.valueOf(-1), cache.getUnchecked(1));
    assertEquals(Integer.valueOf(3), cache.getUnchecked(2));

  /** Previous version of BigIntegerMath.factorial, kept for timing purposes. */
  private static BigInteger oldSlowFactorial(int n) {
    if (n <= 20) {
      return BigInteger.valueOf(LongMath.factorial(n));
    } else {
      int k = 20;
      return BigInteger.valueOf(LongMath.factorial(k)).multiply(oldSlowFactorial(k, n));
    }
  }

  /** Returns the product of {@code n1} exclusive through {@code n2} inclusive. */

   *
   * @since 14.0
   */
  public static UnsignedInteger fromIntBits(int bits) {
    return new UnsignedInteger(bits);
  }

  /**
   * Returns an {@code UnsignedInteger} that is equal to {@code value}, if possible. The inverse
   * operation of {@link #longValue()}.
   */
  public static UnsignedInteger valueOf(long value) {
    checkArgument(