* if previous calls have initialized the {@code PermissionSupplier} fields.
   *
   * <p>This lets us test the effects of different values of the {@code user.name} system property
   * without needing a separate VM or classloader.
   */
  @IgnoreJRERequirement // used only when Path is available (and only from tests)
  @VisibleForTesting

   */
  ALLOWS_NULL_KEY_QUERIES,
  ALLOWS_NULL_KEYS(ALLOWS_NULL_KEY_QUERIES),
  /**
   * The map does not throw {@code NullPointerException} on calls such as {@code
   * containsValue(null)}, {@code values().contains(null)} or {@code values().remove(null)}.
   */
  ALLOWS_NULL_VALUE_QUERIES,
  ALLOWS_NULL_VALUES(ALLOWS_NULL_VALUE_QUERIES),
  /**
   * The map does not throw {@code NullPointerException} on calls such as {@code

    };
    int[] bases = {2, 5, 7, 8, 10, 16};
    for (int base : bases) {
      for (String x : tests) {
        BigInteger xValue = new BigInteger(x, 16);
        long xLong = xValue.longValue(); // signed
        assertThat(UnsignedLongs.toString(xLong, base)).isEqualTo(xValue.toString(base));
      }
    }
  }

  public void testJoin() {
    assertThat(UnsignedLongs.join(",")).isEmpty();

    /** Returns a string for this list of query names and values. */
    private fun List<String?>.toQueryString(out: StringBuilder) {
      for (i in 0 until size step 2) {
        val name = this[i]
        val value = this[i + 1]
        if (i > 0) out.append('&')
        out.append(name)
        if (value != null) {
          out.append('=')
          out.append(value)
        }
      }
    }

    /**

   * is precisely representable as a {@code double}, its {@code double} value will be returned;
   * otherwise, the rounding will choose between the two nearest representable values with {@code
   * mode}.
   *
   * <p>For the case of {@link RoundingMode#HALF_DOWN}, {@code HALF_UP}, and {@code HALF_EVEN},
   * infinite {@code double} values are considered infinitely far away. For example, 2^2000 is not

        Secured secured = MultipleRolesClass.class.getAnnotation(Secured.class);
        String[] roles1 = secured.value();
        String[] roles2 = secured.value();

        // Different array instances should be returned
        assertNotSame(roles1, roles2);

        // But values should be the same
        assertEquals(roles1.length, roles2.length);
        for (int i = 0; i < roles1.length; i++) {

            return defaultLang;
        }

        return normalizeLang(value);
    }

    /**
     * Normalizes a language string.
     *
     * @param value The language string to normalize.
     * @return The normalized language string.
     */
    public String normalizeLang(final String value) {
        if (StringUtil.isBlank(value)) {
            return null;
        }

        // The BigInteger implementation is tested separately, use it as the reference.
        // Promote the int value (rather than using intValue() on the expected value) to avoid
        // any risk of truncation which could lead to a false positive.
        assertEquals(BigIntegerMath.sqrt(valueOf(x), mode), valueOf(IntMath.sqrt(x, mode)));
      }
    }
  }

  /* Relies on the correctness of sqrt(int, FLOOR). */

      Class<@NonNull T> type, @ParametricNullness T value) {
    return cast(type, put(type, value));
  }

  @Override
  public <T extends @NonNull B> @Nullable T getInstance(Class<T> type) {
    return cast(type, get(type));
  }

  @CanIgnoreReturnValue
  private static <T> @Nullable T cast(Class<T> type, @Nullable Object value) {
    return Primitives.wrap(type).cast(value);
  }

    private Object writeReplace() {

  @CollectionSize.Require(SEVERAL)
  public void testRemovePresentConcurrentWithValuesIteration() {
    assertThrows(
        ConcurrentModificationException.class,
        () -> {
          Iterator<V> iterator = getMap().values().iterator();
          getMap().remove(k0());
          iterator.next();
        });
  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_notPresent() {