func (s *watcherSuite) TestStringsWatcherStopsWithPendingSend(c *gc.C) {
// Call the Deployer facade's WatchUnits for machine-0.
var results params.StringsWatchResults
args := params.Entities{Entities: []params.Entity{{Tag: s.rawMachine.Tag()}}}
err := s.stateAPI.Call("Deployer", "", "WatchUnits", args, &results)
c.Assert(err, gc.IsNil)
c.Assert(results.Results, gc.HasLen, 1)
result := results.Results[0]
c.Assert(result.Error, gc.IsNil)
// Start a StringsWatcher and check the initial event.
w := watcher.NewStringsWatcher(s.stateAPI, result)
wc := statetesting.NewStringsWatcherC(c, s.State, w)
// Create a service, deploy a unit of it on the machine.
mysql := s.AddTestingService(c, "mysql", s.AddTestingCharm(c, "mysql"))
principal, err := mysql.AddUnit()
c.Assert(err, gc.IsNil)
err = principal.AssignToMachine(s.rawMachine)
c.Assert(err, gc.IsNil)
// Ensure the initial event is delivered. Then test the watcher
// can be stopped cleanly without reading the pending change.
s.BackingState.StartSync()
statetesting.AssertCanStopWhenSending(c, w)
wc.AssertClosed()
}
func (s *watcherSuite) TestNotifyWatcherStopsWithPendingSend(c *gc.C) {
var results params.NotifyWatchResults
args := params.Entities{Entities: []params.Entity{{Tag: s.rawMachine.Tag()}}}
err := s.stateAPI.Call("Machiner", "", "Watch", args, &results)
c.Assert(err, gc.IsNil)
c.Assert(results.Results, gc.HasLen, 1)
result := results.Results[0]
c.Assert(result.Error, gc.IsNil)
// params.NotifyWatcher conforms to the state.NotifyWatcher interface
w := watcher.NewNotifyWatcher(s.stateAPI, result)
wc := statetesting.NewNotifyWatcherC(c, s.State, w)
// Now, without reading any changes try stopping the watcher.
statetesting.AssertCanStopWhenSending(c, w)
wc.AssertClosed()
}