val buffer = Buffer()
      requestBody.writeTo(buffer)
      assertThat(buffer.readUtf8()).isEqualTo("Hello")
    }
  }

  @Test
  fun testSha256() {
    val hash = "Hello".toRequestBody().sha256().hex()
    assertThat(hash).isEqualTo("185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969")
  }

  private inline fun <T> assertOnFileDescriptor(