val body = body("")
    assertThat(body.byteString()).isEqualTo(ByteString.EMPTY)
  }

  @Test
  fun byteStringSeesBom() {
    val body = body("efbbbf68656c6c6f")
    val actual = body.byteString()
    val expected: ByteString = "efbbbf68656c6c6f".decodeHex()
    assertThat(actual).isEqualTo(expected)
  }

  @Test
  fun byteStringClosesUnderlyingSource() {
    val closed = AtomicBoolean()