val reader = BufferedReader(InputStreamReader(connection.inputStream, UTF_8))
    assertThat(connection.responseCode).isEqualTo(HttpURLConnection.HTTP_OK)
    assertThat(reader.readLine()).isEqualTo("hello world")
    val request = server.takeRequest()
    assertThat(request.requestLine).isEqualTo("GET / HTTP/1.1")
    assertThat(request.headers["Accept-Language"]).isEqualTo("en-US")

import java.util.ArrayDeque;
import java.util.Queue;
import javax.annotation.CheckForNull;

/**
 * A class for reading lines of text. Provides the same functionality as {@link
 * java.io.BufferedReader#readLine()} but for all {@link Readable} objects, not just instances of
 * {@link Reader}.
 *
 * @author Chris Nokleberg
 * @since 1.0
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault

  }

  public void testNewDataInput_readLine() {
    ByteArrayDataInput in =
        ByteStreams.newDataInput(
            "This is a line\r\nThis too\rand this\nand also this".getBytes(Charsets.UTF_8));
    assertEquals("This is a line", in.readLine());
    assertEquals("This too", in.readLine());
    assertEquals("and this", in.readLine());
    assertEquals("and also this", in.readLine());
  }

     * @return 一行の文字列。終端に達した場合は{@literal null}
     * @see BufferedReader#readLine()
     */
    public static String readLine(final BufferedReader reader) {
        assertArgumentNotNull("reader", reader);

        try {
            return reader.readLine();
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    /**

    DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(data));
    UnsupportedOperationException expected =
        assertThrows(UnsupportedOperationException.class, () -> in.readLine());
    assertThat(expected).hasMessageThat().isEqualTo("readLine is not supported");
  }

  public void testReadLittleEndian() throws IOException {
    DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(data));

    DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(data));
    UnsupportedOperationException expected =
        assertThrows(UnsupportedOperationException.class, () -> in.readLine());
    assertThat(expected).hasMessageThat().isEqualTo("readLine is not supported");
  }

  public void testReadLittleEndian() throws IOException {
    DataInput in = new LittleEndianDataInputStream(new ByteArrayInputStream(data));

  /** Read a single line counted against the header size limit. */
  fun readLine(): String {
    val line = source.readUtf8LineStrict(headerLimit)
    headerLimit -= line.length.toLong()
    return line
  }

  /** Reads headers or trailers. */
  fun readHeaders(): Headers {
    val result = Headers.Builder()
    while (true) {
      val line = readLine()
      if (line.isEmpty()) break
      result.addLenient(line)
    }

    val reader = BufferedReader(InputStreamReader(inputStream, StandardCharsets.UTF_8))
    assertThat(connection.getResponseCode()).isEqualTo(HttpURLConnection.HTTP_OK)
    assertThat(reader.readLine()).isEqualTo("hello world")
    val request = server.takeRequest()
    assertThat(request.requestLine).isEqualTo("GET / HTTP/1.1")
    assertThat(request.getHeader("Accept-Language")).isEqualTo("en-US")

        }
        return result;
    }

    static void populate( Reader r ) throws IOException {
        String line;
        BufferedReader br = new BufferedReader( r );

        while(( line = br.readLine() ) != null ) {
            line = line.toUpperCase().trim();
            if( line.length() == 0 ) {
                continue;
            } else if( line.charAt( 0 ) == '#' ) {

// of the line. The returned buffer is only valid until the next call to
// ReadLine. ReadLine either returns a non-nil line or it returns an error,
// never both.
//
// The text returned from ReadLine does not include the line end ("\r\n" or "\n").
// No indication or error is given if the input ends without a final line end.
// Calling [Reader.UnreadByte] after ReadLine will always unread the last byte read