)
    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
  fun write() {
    val operator =
      FileOperator(
        randomAccessFile!!.getChannel(),
      )
    val buffer1 = Buffer().writeUtf8("Hello, World")
    operator.write(0, buffer1, 5)