}
  }

  @Synchronized private fun initUncaughtException(throwable: Throwable) {
    if (uncaughtException == null) {
      uncaughtException = throwable
    }
  }

  @Synchronized fun takeUncaughtException(): Throwable? =
    uncaughtException
      .also { uncaughtException = null }

  fun ensureAllConnectionsReleased() {
    testClient?.let {
      val connectionPool = it.connectionPool