assertThat(buffer.readUtf8()).isEqualTo("Hello")

      assertThrows(IOException::class.java) {
        requestBody.writeTo(Buffer())
      }
    }
  }

  @Test
  fun testFileDescriptorAfterClose() {
    val closedRequestBody = assertOnFileDescriptor { it.toRequestBody() }

    assertThrows(IOException::class.java) {
      closedRequestBody.writeTo(Buffer())
    }
  }

  @Test