pool: RealConnectionPool,
    route: Route,
    idleAtNanos: Long = Long.MAX_VALUE,
    taskRunner: TaskRunner = this.taskRunner,
  ): RealConnection {
    val result =
      RealConnection.newTestConnection(
        taskRunner = taskRunner,
        connectionPool = pool,
        route = route,
        socket = Socket(),
        idleAtNs = idleAtNanos,
      )
    result.withLock { pool.put(result) }