}

    Alphabet lowerCase() {
      if (!hasUpperCase()) {
        return this;
      }
      checkState(!hasLowerCase(), "Cannot call lowerCase() on a mixed-case alphabet");
      char[] lowerCased = new char[chars.length];
      for (int i = 0; i < chars.length; i++) {
        lowerCased[i] = Ascii.toLowerCase(chars[i]);
      }
      Alphabet lowerCase = new Alphabet(name + ".lowerCase()", lowerCased);

 * href="https://tools.ietf.org/html/rfc2046">2046</a>.
 *
 * <p>All portions of the media type that are case-insensitive (type, subtype, parameter attributes)
 * are normalized to lowercase. The value of the {@code charset} parameter is normalized to
 * lowercase, but all others are left as-is.
 *
 * <p>Note that this specifically does <strong>not</strong> represent the value of the MIME {@code

    byte[] data = fillByteArray(50, 0xdd);

    checkSha1("125d7342b9ac11cd91a39af48aa17b4f63f175d3", key, data);
  }

  public void testRfc2202_hmacSha1_case4() {
    byte[] key = base16().lowerCase().decode("0102030405060708090a0b0c0d0e0f10111213141516171819");
    byte[] data = fillByteArray(50, 0xcd);

    checkSha1("4c9007f4026250c6bc8414f9bf50c86c2d7235da", key, data);
  }

    assertThat(base16().upperCase()).isSameInstanceAs(base16());
  }

  public void testBase16LowerCase() {
    BaseEncoding lowerCase = base16().lowerCase();
    assertThat(lowerCase).isNotSameInstanceAs(base16());
    assertThat(lowerCase).isSameInstanceAs(base16().lowerCase());
    testEncodingWithCasing(lowerCase, "foobar", "666f6f626172");
  }

  public void testBase16IgnoreCase() {
    BaseEncoding ignoreCase = base16().ignoreCase();

   * lowercase equivalent. Otherwise returns the argument.
   */
  public static char toLowerCase(char c) {
    return isUpperCase(c) ? (char) (c ^ CASE_MASK) : c;
  }

  /**
   * Returns a copy of the input string in which all {@linkplain #isLowerCase(char) lowercase ASCII

/**
 * Unit test for {@link Ascii}.
 *
 * @author Craig Berry
 */
@GwtCompatible
public class AsciiTest extends TestCase {

  /**
   * The Unicode points {@code 00c1} and {@code 00e1} are the upper- and lowercase forms of
   * A-with-acute-accent, {@code Á} and {@code á}.
   */
  private static final String IGNORED = "`10-=~!@#$%^&*()_+[]\\{}|;':\",./<>?'\u00c1\u00e1\n";

    return JavaUpperCase.INSTANCE;
  }

  /**
   * Determines whether a BMP character is lower case according to {@linkplain
   * Character#isLowerCase(char) Java's definition}.
   *
   * @deprecated Some lowercase characters are supplementary characters; see the class
   *     documentation.
   * @since 19.0 (since 1.0 as constant {@code JAVA_LOWER_CASE})
   */
  @Deprecated
  public static CharMatcher javaLowerCase() {

    byte[] data = fillByteArray(50, 0xdd);

    checkSha1("125d7342b9ac11cd91a39af48aa17b4f63f175d3", key, data);
  }

  public void testRfc2202_hmacSha1_case4() {
    byte[] key = base16().lowerCase().decode("0102030405060708090a0b0c0d0e0f10111213141516171819");
    byte[] data = fillByteArray(50, 0xcd);

    checkSha1("4c9007f4026250c6bc8414f9bf50c86c2d7235da", key, data);
  }

    /** The key of the configuration. e.g. false */
    String LDAP_GROUP_NAME_WITH_UNDERSCORES = "ldap.group.name.with.underscores";

    /** The key of the configuration. e.g. false */
    String LDAP_LOWERCASE_PERMISSION_NAME = "ldap.lowercase.permission.name";

    /** The key of the configuration. e.g. true */
    String LDAP_ALLOW_EMPTY_PERMISSION = "ldap.allow.empty.permission";

    /** The key of the configuration. e.g. true */

    assertThat(base16().upperCase()).isSameInstanceAs(base16());
  }

  public void testBase16LowerCase() {
    BaseEncoding lowerCase = base16().lowerCase();
    assertThat(lowerCase).isNotSameInstanceAs(base16());
    assertThat(lowerCase).isSameInstanceAs(base16().lowerCase());
    testEncodingWithCasing(lowerCase, "foobar", "666f6f626172");
  }

  public void testBase16IgnoreCase() {
    BaseEncoding ignoreCase = base16().ignoreCase();