val credential: String?,
  val scheme: String?,
) : Authenticator {
  val responses = mutableListOf<Response>()
  val routes = mutableListOf<Route>()

  fun onlyResponse() = responses.single()

  fun onlyRoute() = routes.single()

  @Throws(IOException::class)
  override fun authenticate(
    route: Route?,
    response: Response,
  ): Request? {
    if (route == null) throw NullPointerException("route == null")

    assertThat(server.takeRequest().headers["Authorization"]).isNull()
    assertThat(server.takeRequest().headers["Authorization"]).isEqualTo(credential)
    assertThat(authenticator.onlyRoute().proxy).isEqualTo(Proxy.NO_PROXY)
    val response = authenticator.onlyResponse()
    assertThat(response.request.url.toUrl().path).isEqualTo("/private")

    client =
      client.newBuilder()
        .authenticator(authenticator)
        .build()
    executeSynchronously("/")
      .assertCode(401)
    assertThat(authenticator.onlyRoute()).isNotNull()
  }

  @Test
  fun delete() {
    server.enqueue(MockResponse(body = "abc"))
    val request =
      Request.Builder()
        .url(server.url("/"))
        .delete()