* exceptions thrown from the test do not cause this check to fail.
   */
  @RegisterExtension
  val noDataLeftBehind =
    AfterEachCallback { context: ExtensionContext ->
      if (context.executionException.isPresent) return@AfterEachCallback
      assertThat(data.readByteString().hex(), "Data not empty")
        .isEqualTo("")
    }

  // Mutually exclusive. Use the one corresponding to the peer whose behavior you wish to test.

    parameterContext: ParameterContext,
    extensionContext: ExtensionContext,
  ): Any {
    val nameAnnotation = parameterContext.findAnnotation(MockWebServerInstance::class.java)
    val name =
      if (nameAnnotation.isPresent) {
        nameAnnotation.get().name
      } else {
        defaultName
      }
    return extensionContext.resource.server(name)
  }

  /** Start the servers passed in as test method parameters. */