executeSynchronously(request)
      .assertFailure(IOException::class.java)
    assertThat(client.connectionPool.idleConnectionCount()).isEqualTo(1)
  }

  @Test
  fun failedProxyAuthenticatorReleasesConnection() {
    server.enqueue(
      MockResponse(code = 407),
    )
    client =
      client
        .newBuilder()
        .proxyAuthenticator { _: Route?, _: Response ->