func (s *pingerSuite) checkConnectionDies(c *gc.C, conn api.Connection) {
attempt := utils.AttemptStrategy{
Total: coretesting.LongWait,
Delay: coretesting.ShortWait,
}
for a := attempt.Start(); a.Next(); {
err := conn.Ping()
if err != nil {
c.Assert(err, gc.ErrorMatches, "connection is shut down")
return
}
}
c.Fatal("connection didn't get shut down")
}