and `www.squareup.com`. If a server refuses such sharing it will return HTTP 421 and OkHttp will
    automatically retry on an unshared connection.
 *  Fix: Don't crash if a TLS tunnel's response body is truncated.
 *  Fix: Don't track unusable routes beyond their usefulness. We had a bug where we could track
    certain bad routes indefinitely; now we only track the ones that could be necessary.

      val fileBuilder = StringBuilder(key).append('.')
      val truncateTo = fileBuilder.length
      for (i in 0 until valueCount) {
        fileBuilder.append(i)
        cleanFiles += directory / fileBuilder.toString()
        fileBuilder.append(".tmp")
        dirtyFiles += directory / fileBuilder.toString()
        fileBuilder.setLength(truncateTo)
      }
    }

    val part = parts.nextPart()!!
    assertThat(part.body.readUtf8()).isEqualTo("abcd")

    assertThat(parts.nextPart()).isNull()
  }

  @Test fun `truncated multipart`() {
    val multipart =
      """
      |--simple boundary
      |
      |abcd
      |efgh
      |
      """.trimMargin()
        .replace("\n", "\r\n")

    val parts =

   * body. If fewer than [byteCount] bytes are in the response body, the full response body is
   * returned. If more than [byteCount] bytes are in the response body, the returned value
   * will be truncated to [byteCount] bytes.
   *
   * It is an error to call this method after the body has been consumed.
   *
   * **Warning:** this method loads the requested bytes into memory. Most applications should set

      this.notAfter = notAfter
    }

    /**
     * Sets the certificate to be valid immediately and until the specified duration has elapsed.
     * The precision of this field is seconds; further precision will be truncated.
     */
    fun duration(
      duration: Long,
      unit: TimeUnit,
    ) = apply {
      val now = System.currentTimeMillis()
      validityInterval(now, now + unit.toMillis(duration))
    }

      object : Dispatcher() {
        override fun dispatch(request: RecordedRequest): MockResponse {
          return upgradeResponse(request)
            .body(Buffer().write("81".decodeHex())) // Truncated frame.
            .removeHeader("Content-Length")
            .socketPolicy(KeepOpen)
            .build()
        }
      }
    val webSocket: WebSocket = newWebSocket()
    clientListener.assertOpen()