fun tearDown() {
    randomAccessFile!!.close()
  }

  @Test
  fun read() {
    write("Hello, World".encodeUtf8())
    val operator =
      FileOperator(
        randomAccessFile!!.getChannel(),
      )
    val buffer = Buffer()
    operator.read(0, buffer, 5)
    assertThat(buffer.readUtf8()).isEqualTo("Hello")
    operator.read(4, buffer, 5)
    assertThat(buffer.readUtf8()).isEqualTo("o, Wo")
  }

  @Test