assertThat(responseBody.readUtf8Line())
        .isEqualTo("response B")
      requestBody.writeUtf8("request C\n")
      requestBody.flush()
      assertThat(responseBody.readUtf8Line())
        .isEqualTo("response D")
      requestBody.writeUtf8("request E\n")
      requestBody.flush()
      assertThat(responseBody.readUtf8Line())
        .isEqualTo("response F")
      requestBody.close()

            sink.writeUtf8("client says hello\n")
            sink.flush()

            assertThat(source.readUtf8Line()).isEqualTo("server says hello")

            sink.writeUtf8("client says goodbye\n")
            sink.flush()

            assertThat(source.readUtf8Line()).isEqualTo("server says goodbye")

            assertThat(source.exhausted()).isTrue()
          }
        }

      }
    }
  }

  private fun readJournalLines(): List<String> {
    val result = mutableListOf<String>()
    filesystem.read(journalFile) {
      while (true) {
        val line = readUtf8Line() ?: break
        result.add(line)
      }
    }
    return result
  }

  private fun getCleanFile(
    key: String,
    index: Int,
  ) = cacheDir / "$key.$index"

    server.enqueue(
      MockResponse
        .Builder()
        .body("Request #2")
        .build(),
    )
    val bodySource = get(server.url("/")).body.source()
    assertThat(bodySource.readUtf8Line()).isEqualTo("ABCDE")
    bodySource.use {
      assertFailsWith<IOException> {
        bodySource.readUtf8(21)
      }
    }
    assertThat(cache.writeAbortCount()).isEqualTo(1)