public void testGetKeyMatchesString() {
    for (StandardSystemProperty property : StandardSystemProperty.values()) {
      String fieldName = property.name();
      String expected = Ascii.toLowerCase(fieldName).replaceAll("_", ".");
      assertEquals(expected, property.key());
    }
  }

  public void testGetValue() {
    for (StandardSystemProperty property : StandardSystemProperty.values()) {

    /**
     * Target must be a directory flag.
     */
    int FLAGS_TARGET_MUST_BE_DIRECTORY = 0x0002;
    /**
     * Copy target in ASCII mode flag.
     */
    int FLAGS_COPY_TARGET_MODE_ASCII = 0x0004;
    /**
     * Copy source in ASCII mode flag.
     */
    int FLAGS_COPY_SOURCE_MODE_ASCII = 0x0008;
    /**
     * Verify all write operations flag.
     */

  /**
   * Returns an {@link Escaper} instance that escapes strings so they can be safely included in <a
   * href="https://url.spec.whatwg.org/#syntax-url-path-segment">URL path segments</a>. The returned
   * escaper escapes all non-ASCII characters, even though <a
   * href="https://url.spec.whatwg.org/#url-code-points">many of these are accepted in modern
   * URLs</a>. (<a href="https://url.spec.whatwg.org/#path-state">If the escaper were to leave these

 */
@GwtCompatible
@NullUnmarked
public class CharsetsTest extends TestCase {

  @J2ktIncompatible
  @GwtIncompatible // Non-UTF-8 Charset
  public void testUsAscii() {
    assertEquals(Charset.forName("US-ASCII"), Charsets.US_ASCII);
  }

  @J2ktIncompatible
  @GwtIncompatible // Non-UTF-8 Charset
  public void testIso88591() {
    assertEquals(Charset.forName("ISO-8859-1"), Charsets.ISO_8859_1);
  }

    private final int c;
    // The number of finalization rounds.
    private final int d;

    // Four 64-bit words of internal state.
    // The initial state corresponds to the ASCII string "somepseudorandomlygeneratedbytes",
    // big-endian encoded. There is nothing special about this value; the only requirement
    // was some asymmetry so that the initial v0 and v1 differ from v2 and v3.

    val headers =
      Headers
        .Builder()
        .add("WWW-Authenticate: Basic realm=\"protected area\", charset=\"US-ASCII\"")
        .build()
    val expectedAuthParams = mutableMapOf<String?, String>()
    expectedAuthParams["realm"] = "protected area"
    expectedAuthParams["charset"] = "US-ASCII"
    assertThat(headers.parseChallenges("WWW-Authenticate"))
      .isEqualTo(listOf(Challenge("Basic", expectedAuthParams)))
  }

        final int start = bufferIndex;

        pathConsumed = readInt2(buffer, bufferIndex);
        bufferIndex += 2;
        /* Samba 2.2.8a will reply with Unicode paths even though
         * ASCII is negotiated so we must use flags2 (probably
         * should anyway).
         */
        if ((flags2 & FLAGS2_UNICODE) != 0) {
            pathConsumed /= 2;
        }

 *  Fix: Don't crash when URLs have IPv4-mapped IPv6 addresses.
 *  Fix: Don't crash when building `HandshakeCertificates` on Android API 28.
 *  Fix: Permit multipart file names to contain non-ASCII characters.
 *  New: API to get MockWebServer's dispatcher.
 *  New: API to access headers as `java.time.Instant`.
 *  New: Fail fast if a `SSLSocketFactory` is used as a `SocketFactory`.

        final int start = dstIndex;
        byte[] descr;
        final int which = subCommand == NET_SERVER_ENUM2 ? 0 : 1;

        try {
            descr = DESCR[which].getBytes("ASCII");
        } catch (final UnsupportedEncodingException uee) {
            return 0;
        }

        writeInt2(subCommand & 0xFF, dst, dstIndex);
        dstIndex += 2;

    Random random = new Random(0xdeadbeef); // for unpredictable but reproducible behavior
    sb.ensureCapacity(size);
    for (int k = 0; k < size; k++) {
      // [9-127) includes all ascii non-control characters
      sb.append((char) (random.nextInt(127 - 9) + 9));
    }
    String string = sb.toString();
    sb.setLength(0);
    data = ByteSource.wrap(string.getBytes(charset));
  }