* by malformed content types.
   */
  private val contentTypeString: String?,
  private val contentLength: Long,
  private val source: BufferedSource,
) : ResponseBody() {
  override fun contentLength(): Long = contentLength

  override fun contentType(): MediaType? = contentTypeString?.toMediaTypeOrNull()

  override fun source(): BufferedSource = source

  ) {
    filePath = tempDir.toOkioPath() / "file.txt"
  }

  @Test
  fun testFileDescriptor() {
    assertOnFileDescriptor { fd ->
      val requestBody = fd.toRequestBody()

      assertThat(requestBody.contentLength()).isEqualTo(-1L)
      assertThat(requestBody.isOneShot()).isEqualTo(true)
    }
  }

  @Test
  fun testFileDescriptorRead() {
    assertOnFileDescriptor(content = "Hello") { fd ->

  sizeMapper: (T) -> Int,
): T {
  val contentLength = contentLength()
  if (contentLength > Int.MAX_VALUE) {
    throw IOException("Cannot buffer entire body for content length: $contentLength")
  }

  val bytes = source().use(consumer)
  val size = sizeMapper(bytes)
  if (contentLength != -1L && contentLength != size.toLong()) {
    throw IOException("Content-Length ($contentLength) and stream length ($size) disagree")
  }

        if (done) {
          System.out.println("completed");
        } else {
          if (firstUpdate) {
            firstUpdate = false;
            if (contentLength == -1) {
              System.out.println("content-length: unknown");
            } else {
              System.out.format("content-length: %d\n", contentLength);
            }
          }

    val expected = "sim=ple&hey=there&help=me"
    assertThat(body.contentLength()).isEqualTo(expected.length.toLong())
    val buffer = Buffer()
    body.writeTo(buffer)
    assertThat(buffer.readUtf8()).isEqualTo(expected)
  }

  @Test
  fun buildEmptyForm() {
    val body = FormBody.Builder().build()
    val expected = ""
    assertThat(body.contentLength()).isEqualTo(expected.length.toLong())
    val buffer = Buffer()

  /**
   * Returns the number of bytes that will be written to sink in a call to [writeTo],
   * or -1 if that count is unknown.
   */
  @Throws(IOException::class)
  open fun contentLength(): Long = commonContentLength()

  /** Writes the content of this request to [sink]. */
  @Throws(IOException::class)
  abstract fun writeTo(sink: BufferedSink)

  /**

import okio.Source
import okio.Timeout
import okio.buffer

internal class UnreadableResponseBody(
  private val mediaType: MediaType?,
  private val contentLength: Long,
) : ResponseBody(), Source {
  override fun contentType() = mediaType

  override fun contentLength() = contentLength

  override fun source() = buffer()

  override fun read(
    sink: Buffer,
    byteCount: Long,
  ): Long {

      ) {
        exchange.noNewExchangesOnConnection()
      }
      if ((code == 204 || code == 205) && response.body.contentLength() > 0L) {
        throw ProtocolException(
          "HTTP $code had non-zero Content-Length: ${response.body.contentLength()}",
        )
      }
      return response
    } catch (e: IOException) {
      if (sendRequestException != null) {

 * called by readers.
 */
@ExperimentalOkHttpApi
interface MockResponseBody {
  /** The length of this response in bytes, or -1 if unknown. */
  val contentLength: Long

  @Throws(IOException::class)
  fun writeTo(sink: BufferedSink)

  val defensiveCopy = clone()
  return BufferMockResponseBody(defensiveCopy)
}

internal class BufferMockResponseBody(
  val buffer: Buffer,
) : MockResponseBody {
  override val contentLength = buffer.size

  override fun writeTo(sink: BufferedSink) {
    buffer.copyTo(sink.buffer)
    sink.emitCompleteSegments()
  }