func (s *machineSuite) TestWatchUnits(c *gc.C) {
w, err := s.apiMachine.WatchUnits()
c.Assert(err, gc.IsNil)
defer statetesting.AssertStop(c, w)
wc := statetesting.NewStringsWatcherC(c, s.BackingState, w)
// Initial event.
wc.AssertChange("wordpress/0")
wc.AssertNoChange()
// Change something other than the life cycle and make sure it's
// not detected.
err = s.machines[0].SetPassword("foo")
c.Assert(err, gc.ErrorMatches, "password is only 3 bytes long, and is not a valid Agent password")
wc.AssertNoChange()
err = s.machines[0].SetPassword("foo-12345678901234567890")
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
// Unassign unit 0 from the machine and check it's detected.
err = s.units[0].UnassignFromMachine()
c.Assert(err, gc.IsNil)
wc.AssertChange("wordpress/0")
wc.AssertNoChange()
statetesting.AssertStop(c, w)
wc.AssertClosed()
}
func (s *deployerSuite) TestWatchUnits(c *gc.C) {
machine, err := s.st.Machine(s.machine.Tag())
c.Assert(err, gc.IsNil)
w, err := machine.WatchUnits()
c.Assert(err, gc.IsNil)
defer statetesting.AssertStop(c, w)
wc := statetesting.NewStringsWatcherC(c, s.BackingState, w)
// Initial event.
wc.AssertChange("mysql/0", "logging/0")
wc.AssertNoChange()
// Change something other than the lifecycle and make sure it's
// not detected.
err = s.subordinate.SetPassword("foo")
c.Assert(err, gc.ErrorMatches, "password is only 3 bytes long, and is not a valid Agent password")
wc.AssertNoChange()
err = s.subordinate.SetPassword("foo-12345678901234567890")
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
// Make the subordinate dead and check it's detected.
err = s.subordinate.EnsureDead()
c.Assert(err, gc.IsNil)
wc.AssertChange("logging/0")
wc.AssertNoChange()
statetesting.AssertStop(c, w)
wc.AssertClosed()
}
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 *withoutStateServerSuite) TestWatchEnvironMachines(c *gc.C) {
c.Assert(s.resources.Count(), gc.Equals, 0)
got, err := s.provisioner.WatchEnvironMachines()
c.Assert(err, gc.IsNil)
want := params.StringsWatchResult{
StringsWatcherId: "1",
Changes: []string{"0", "1", "2", "3", "4"},
}
c.Assert(got.StringsWatcherId, gc.Equals, want.StringsWatcherId)
c.Assert(got.Changes, jc.SameContents, want.Changes)
// Verify the resources were registered and stop them when done.
c.Assert(s.resources.Count(), gc.Equals, 1)
resource := s.resources.Get("1")
defer statetesting.AssertStop(c, resource)
// Check that the Watch has consumed the initial event ("returned"
// in the Watch call)
wc := statetesting.NewStringsWatcherC(c, s.State, resource.(state.StringsWatcher))
wc.AssertNoChange()
// Make sure WatchEnvironMachines fails with a machine agent login.
anAuthorizer := s.authorizer
anAuthorizer.MachineAgent = true
anAuthorizer.EnvironManager = false
aProvisioner, err := provisioner.NewProvisionerAPI(s.State, s.resources, anAuthorizer)
c.Assert(err, gc.IsNil)
result, err := aProvisioner.WatchEnvironMachines()
c.Assert(err, gc.ErrorMatches, "permission denied")
c.Assert(result, gc.DeepEquals, params.StringsWatchResult{})
}
func (s *firewallerSuite) TestWatchUnits(c *gc.C) {
c.Assert(s.resources.Count(), gc.Equals, 0)
args := addFakeEntities(params.Entities{Entities: []params.Entity{
{Tag: s.machines[0].Tag()},
{Tag: s.service.Tag()},
{Tag: s.units[0].Tag()},
}})
result, err := s.firewaller.WatchUnits(args)
c.Assert(err, gc.IsNil)
c.Assert(result, jc.DeepEquals, params.StringsWatchResults{
Results: []params.StringsWatchResult{
{Changes: []string{"wordpress/0"}, StringsWatcherId: "1"},
{Error: apiservertesting.ErrUnauthorized},
{Error: apiservertesting.ErrUnauthorized},
{Error: apiservertesting.NotFoundError("machine 42")},
{Error: apiservertesting.ErrUnauthorized},
{Error: apiservertesting.ErrUnauthorized},
{Error: apiservertesting.ErrUnauthorized},
{Error: apiservertesting.ErrUnauthorized},
{Error: apiservertesting.ErrUnauthorized},
},
})
// Verify the resource was registered and stop when done
c.Assert(s.resources.Count(), gc.Equals, 1)
c.Assert(result.Results[0].StringsWatcherId, gc.Equals, "1")
resource := s.resources.Get("1")
defer statetesting.AssertStop(c, resource)
// Check that the Watch has consumed the initial event ("returned" in
// the Watch call)
wc := statetesting.NewStringsWatcherC(c, s.State, resource.(state.StringsWatcher))
wc.AssertNoChange()
}
func (s *deployerSuite) TestWatchUnits(c *gc.C) {
c.Assert(s.resources.Count(), gc.Equals, 0)
args := params.Entities{Entities: []params.Entity{
{Tag: "machine-1"},
{Tag: "machine-0"},
{Tag: "machine-42"},
}}
result, err := s.deployer.WatchUnits(args)
c.Assert(err, gc.IsNil)
sort.Strings(result.Results[0].Changes)
c.Assert(result, gc.DeepEquals, params.StringsWatchResults{
Results: []params.StringsWatchResult{
{Changes: []string{"logging/0", "mysql/0"}, StringsWatcherId: "1"},
{Error: apiservertesting.ErrUnauthorized},
{Error: apiservertesting.ErrUnauthorized},
},
})
// Verify the resource was registered and stop when done
c.Assert(s.resources.Count(), gc.Equals, 1)
c.Assert(result.Results[0].StringsWatcherId, gc.Equals, "1")
resource := s.resources.Get("1")
defer statetesting.AssertStop(c, resource)
// Check that the Watch has consumed the initial event ("returned" in
// the Watch call)
wc := statetesting.NewStringsWatcherC(c, s.State, resource.(state.StringsWatcher))
wc.AssertNoChange()
}
func (s *serviceSuite) TestWatchRelations(c *gc.C) {
w, err := s.apiService.WatchRelations()
c.Assert(err, gc.IsNil)
defer statetesting.AssertStop(c, w)
wc := statetesting.NewStringsWatcherC(c, s.BackingState, w)
// Initial event.
wc.AssertChange()
wc.AssertNoChange()
// Change something other than the lifecycle and make sure it's
// not detected.
err = s.wordpressService.SetExposed()
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
// Add another service and relate it to wordpress,
// check it's detected.
s.addMachineServiceCharmAndUnit(c, "mysql")
rel := s.addRelation(c, "wordpress", "mysql")
wc.AssertChange(rel.String())
// Destroy the relation and check it's detected.
err = rel.Destroy()
c.Assert(err, gc.IsNil)
wc.AssertChange(rel.String())
wc.AssertNoChange()
statetesting.AssertStop(c, w)
wc.AssertClosed()
}
func (s *provisionerSuite) TestWatchEnvironMachines(c *gc.C) {
w, err := s.provisioner.WatchEnvironMachines()
c.Assert(err, gc.IsNil)
defer statetesting.AssertStop(c, w)
wc := statetesting.NewStringsWatcherC(c, s.BackingState, w)
// Initial event.
wc.AssertChange(s.machine.Id())
// Add another 2 machines make sure they are detected.
otherMachine, err := s.State.AddMachine("quantal", state.JobHostUnits)
c.Assert(err, gc.IsNil)
otherMachine, err = s.State.AddMachine("quantal", state.JobHostUnits)
c.Assert(err, gc.IsNil)
wc.AssertChange("1", "2")
// Change the lifecycle of last machine.
err = otherMachine.EnsureDead()
c.Assert(err, gc.IsNil)
wc.AssertChange("2")
// Add a container and make sure it's not detected.
template := state.MachineTemplate{
Series: "quantal",
Jobs: []state.MachineJob{state.JobHostUnits},
}
_, err = s.State.AddMachineInsideMachine(template, s.machine.Id(), instance.LXC)
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
statetesting.AssertStop(c, w)
wc.AssertClosed()
}
func (s *watcherSuite) TestWatchUnitsKeepsEvents(c *gc.C) {
// Create two services, relate them, and add one unit to each - a
// principal and a subordinate.
mysql := s.AddTestingService(c, "mysql", s.AddTestingCharm(c, "mysql"))
logging := s.AddTestingService(c, "logging", s.AddTestingCharm(c, "logging"))
eps, err := s.State.InferEndpoints([]string{"mysql", "logging"})
c.Assert(err, gc.IsNil)
rel, err := s.State.AddRelation(eps...)
c.Assert(err, gc.IsNil)
principal, err := mysql.AddUnit()
c.Assert(err, gc.IsNil)
err = principal.AssignToMachine(s.rawMachine)
c.Assert(err, gc.IsNil)
relUnit, err := rel.Unit(principal)
c.Assert(err, gc.IsNil)
err = relUnit.EnterScope(nil)
c.Assert(err, gc.IsNil)
subordinate, err := logging.Unit("logging/0")
c.Assert(err, gc.IsNil)
// 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)
wc.AssertChange("mysql/0", "logging/0")
wc.AssertNoChange()
// Now, without reading any changes advance the lifecycle of both
// units, inducing an update server-side after each two changes to
// ensure they're reported as separate events over the API.
err = subordinate.EnsureDead()
c.Assert(err, gc.IsNil)
s.BackingState.StartSync()
err = subordinate.Remove()
c.Assert(err, gc.IsNil)
err = principal.EnsureDead()
c.Assert(err, gc.IsNil)
s.BackingState.StartSync()
// Expect these changes as 2 separate events, so that
// nothing gets lost.
wc.AssertChange("logging/0")
wc.AssertChange("mysql/0")
wc.AssertNoChange()
statetesting.AssertStop(c, w)
wc.AssertClosed()
}
func (s *withoutStateServerSuite) TestWatchAllContainers(c *gc.C) {
c.Assert(s.resources.Count(), gc.Equals, 0)
args := params.WatchContainers{Params: []params.WatchContainer{
{MachineTag: s.machines[0].Tag()},
{MachineTag: s.machines[1].Tag()},
{MachineTag: "machine-42"},
{MachineTag: "unit-foo-0"},
{MachineTag: "service-bar"},
}}
result, err := s.provisioner.WatchAllContainers(args)
c.Assert(err, gc.IsNil)
c.Assert(result, gc.DeepEquals, params.StringsWatchResults{
Results: []params.StringsWatchResult{
{StringsWatcherId: "1", Changes: []string{}},
{StringsWatcherId: "2", Changes: []string{}},
{Error: apiservertesting.NotFoundError("machine 42")},
{Error: apiservertesting.ErrUnauthorized},
{Error: apiservertesting.ErrUnauthorized},
},
})
// Verify the resources were registered and stop them when done.
c.Assert(s.resources.Count(), gc.Equals, 2)
m0Watcher := s.resources.Get("1")
defer statetesting.AssertStop(c, m0Watcher)
m1Watcher := s.resources.Get("2")
defer statetesting.AssertStop(c, m1Watcher)
// Check that the Watch has consumed the initial event ("returned"
// in the Watch call)
wc0 := statetesting.NewStringsWatcherC(c, s.State, m0Watcher.(state.StringsWatcher))
wc0.AssertNoChange()
wc1 := statetesting.NewStringsWatcherC(c, s.State, m1Watcher.(state.StringsWatcher))
wc1.AssertNoChange()
}
func (s *ServiceSuite) TestWatchUnitsLifecycle(c *gc.C) {
// Empty initial event when no units.
w := s.mysql.WatchUnits()
defer testing.AssertStop(c, w)
wc := testing.NewStringsWatcherC(c, s.State, w)
wc.AssertChange()
wc.AssertNoChange()
// Create one unit, check one change.
quick, err := s.mysql.AddUnit()
c.Assert(err, gc.IsNil)
wc.AssertChange(quick.Name())
wc.AssertNoChange()
// Destroy that unit (short-circuited to removal), check one change.
err = quick.Destroy()
c.Assert(err, gc.IsNil)
wc.AssertChange(quick.Name())
wc.AssertNoChange()
// Create another, check one change.
slow, err := s.mysql.AddUnit()
c.Assert(err, gc.IsNil)
wc.AssertChange(slow.Name())
wc.AssertNoChange()
// Change unit itself, no change.
preventUnitDestroyRemove(c, slow)
wc.AssertNoChange()
// Make unit Dying, change detected.
err = slow.Destroy()
c.Assert(err, gc.IsNil)
wc.AssertChange(slow.Name())
wc.AssertNoChange()
// Make unit Dead, change detected.
err = slow.EnsureDead()
c.Assert(err, gc.IsNil)
wc.AssertChange(slow.Name())
wc.AssertNoChange()
// Remove unit, final change not detected.
err = slow.Remove()
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
}
func (s *ServiceSuite) TestWatchUnitsBulkEvents(c *gc.C) {
// Alive unit...
alive, err := s.mysql.AddUnit()
c.Assert(err, gc.IsNil)
// Dying unit...
dying, err := s.mysql.AddUnit()
c.Assert(err, gc.IsNil)
preventUnitDestroyRemove(c, dying)
err = dying.Destroy()
c.Assert(err, gc.IsNil)
// Dead unit...
dead, err := s.mysql.AddUnit()
c.Assert(err, gc.IsNil)
preventUnitDestroyRemove(c, dead)
err = dead.Destroy()
c.Assert(err, gc.IsNil)
err = dead.EnsureDead()
c.Assert(err, gc.IsNil)
// Gone unit.
gone, err := s.mysql.AddUnit()
c.Assert(err, gc.IsNil)
err = gone.Destroy()
c.Assert(err, gc.IsNil)
// All except gone unit are reported in initial event.
w := s.mysql.WatchUnits()
defer testing.AssertStop(c, w)
wc := testing.NewStringsWatcherC(c, s.State, w)
wc.AssertChange(alive.Name(), dying.Name(), dead.Name())
wc.AssertNoChange()
// Remove them all; alive/dying changes reported; dead never mentioned again.
err = alive.Destroy()
c.Assert(err, gc.IsNil)
err = dying.EnsureDead()
c.Assert(err, gc.IsNil)
err = dying.Remove()
c.Assert(err, gc.IsNil)
err = dead.Remove()
c.Assert(err, gc.IsNil)
wc.AssertChange(alive.Name(), dying.Name())
wc.AssertNoChange()
}
func (s *uniterSuite) assertOneStringsWatcher(c *gc.C, result params.StringsWatchResults, err error) {
c.Assert(err, gc.IsNil)
c.Assert(result.Results, gc.HasLen, 3)
c.Assert(result.Results[0].Error, gc.DeepEquals, apiservertesting.ErrUnauthorized)
c.Assert(result.Results[1].StringsWatcherId, gc.Equals, "1")
c.Assert(result.Results[1].Changes, gc.NotNil)
c.Assert(result.Results[1].Error, gc.IsNil)
c.Assert(result.Results[2].Error, gc.DeepEquals, apiservertesting.ErrUnauthorized)
// Verify the resource was registered and stop when done
c.Assert(s.resources.Count(), gc.Equals, 1)
resource := s.resources.Get("1")
defer statetesting.AssertStop(c, resource)
// Check that the Watch has consumed the initial event ("returned" in
// the Watch call)
wc := statetesting.NewStringsWatcherC(c, s.State, resource.(state.StringsWatcher))
wc.AssertNoChange()
}
func (s *firewallerSuite) TestWatchEnvironMachines(c *gc.C) {
c.Assert(s.resources.Count(), gc.Equals, 0)
got, err := s.firewaller.WatchEnvironMachines()
c.Assert(err, gc.IsNil)
want := params.StringsWatchResult{
StringsWatcherId: "1",
Changes: []string{"0", "1", "2"},
}
c.Assert(got.StringsWatcherId, gc.Equals, want.StringsWatcherId)
c.Assert(got.Changes, jc.SameContents, want.Changes)
// Verify the resources were registered and stop them when done.
c.Assert(s.resources.Count(), gc.Equals, 1)
resource := s.resources.Get("1")
defer statetesting.AssertStop(c, resource)
// Check that the Watch has consumed the initial event ("returned"
// in the Watch call)
wc := statetesting.NewStringsWatcherC(c, s.State, resource.(state.StringsWatcher))
wc.AssertNoChange()
}
func (s *provisionerSuite) TestWatchContainers(c *gc.C) {
apiMachine, err := s.provisioner.Machine(s.machine.Tag())
c.Assert(err, gc.IsNil)
// Add one LXC container.
template := state.MachineTemplate{
Series: "quantal",
Jobs: []state.MachineJob{state.JobHostUnits},
}
container, err := s.State.AddMachineInsideMachine(template, s.machine.Id(), instance.LXC)
c.Assert(err, gc.IsNil)
w, err := apiMachine.WatchContainers(instance.LXC)
c.Assert(err, gc.IsNil)
defer statetesting.AssertStop(c, w)
wc := statetesting.NewStringsWatcherC(c, s.BackingState, w)
// Initial event.
wc.AssertChange(container.Id())
// Change something other than the containers and make sure it's
// not detected.
err = apiMachine.SetStatus(params.StatusStarted, "not really", nil)
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
// Add a KVM container and make sure it's not detected.
container, err = s.State.AddMachineInsideMachine(template, s.machine.Id(), instance.KVM)
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
// Add another LXC container and make sure it's detected.
container, err = s.State.AddMachineInsideMachine(template, s.machine.Id(), instance.LXC)
c.Assert(err, gc.IsNil)
wc.AssertChange(container.Id())
statetesting.AssertStop(c, w)
wc.AssertClosed()
}
func (s *ServiceSuite) TestWatchRelations(c *gc.C) {
// TODO(fwereade) split this test up a bit.
w := s.mysql.WatchRelations()
defer testing.AssertStop(c, w)
wc := testing.NewStringsWatcherC(c, s.State, w)
wc.AssertChange()
wc.AssertNoChange()
// Add a relation; check change.
mysqlep, err := s.mysql.Endpoint("server")
c.Assert(err, gc.IsNil)
wpch := s.AddTestingCharm(c, "wordpress")
wpi := 0
addRelation := func() *state.Relation {
name := fmt.Sprintf("wp%d", wpi)
wpi++
wp := s.AddTestingService(c, name, wpch)
wpep, err := wp.Endpoint("db")
c.Assert(err, gc.IsNil)
rel, err := s.State.AddRelation(mysqlep, wpep)
c.Assert(err, gc.IsNil)
return rel
}
rel0 := addRelation()
wc.AssertChange(rel0.String())
wc.AssertNoChange()
// Add another relation; check change.
rel1 := addRelation()
wc.AssertChange(rel1.String())
wc.AssertNoChange()
// Destroy a relation; check change.
err = rel0.Destroy()
c.Assert(err, gc.IsNil)
wc.AssertChange(rel0.String())
wc.AssertNoChange()
// Stop watcher; check change chan is closed.
testing.AssertStop(c, w)
wc.AssertClosed()
// Add a new relation; start a new watcher; check initial event.
rel2 := addRelation()
w = s.mysql.WatchRelations()
defer testing.AssertStop(c, w)
wc = testing.NewStringsWatcherC(c, s.State, w)
wc.AssertChange(rel1.String(), rel2.String())
wc.AssertNoChange()
// Add a unit to the new relation; check no change.
unit, err := s.mysql.AddUnit()
c.Assert(err, gc.IsNil)
ru2, err := rel2.Unit(unit)
c.Assert(err, gc.IsNil)
err = ru2.EnterScope(nil)
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
// Destroy the relation with the unit in scope, and add another; check
// changes.
err = rel2.Destroy()
c.Assert(err, gc.IsNil)
rel3 := addRelation()
wc.AssertChange(rel2.String(), rel3.String())
wc.AssertNoChange()
// Leave scope, destroying the relation, and check that change as well.
err = ru2.LeaveScope()
c.Assert(err, gc.IsNil)
wc.AssertChange(rel2.String())
wc.AssertNoChange()
}
func (s *UnitSuite) TestWatchSubordinates(c *gc.C) {
w := s.unit.WatchSubordinateUnits()
defer testing.AssertStop(c, w)
wc := testing.NewStringsWatcherC(c, s.State, w)
wc.AssertChange()
wc.AssertNoChange()
// Add a couple of subordinates, check change.
subCharm := s.AddTestingCharm(c, "logging")
var subUnits []*state.Unit
for i := 0; i < 2; i++ {
// Note: subordinate units can only be created as a side effect of a
// principal entering scope; and a given principal can only have a
// single subordinate unit of each service.
name := "logging" + strconv.Itoa(i)
subSvc := s.AddTestingService(c, name, subCharm)
eps, err := s.State.InferEndpoints([]string{name, "wordpress"})
c.Assert(err, gc.IsNil)
rel, err := s.State.AddRelation(eps...)
c.Assert(err, gc.IsNil)
ru, err := rel.Unit(s.unit)
c.Assert(err, gc.IsNil)
err = ru.EnterScope(nil)
c.Assert(err, gc.IsNil)
units, err := subSvc.AllUnits()
c.Assert(err, gc.IsNil)
c.Assert(units, gc.HasLen, 1)
subUnits = append(subUnits, units[0])
}
wc.AssertChange(subUnits[0].Name(), subUnits[1].Name())
wc.AssertNoChange()
// Set one to Dying, check change.
err := subUnits[0].Destroy()
c.Assert(err, gc.IsNil)
wc.AssertChange(subUnits[0].Name())
wc.AssertNoChange()
// Set both to Dead, and remove one; check change.
err = subUnits[0].EnsureDead()
c.Assert(err, gc.IsNil)
err = subUnits[1].EnsureDead()
c.Assert(err, gc.IsNil)
err = subUnits[1].Remove()
c.Assert(err, gc.IsNil)
wc.AssertChange(subUnits[0].Name(), subUnits[1].Name())
wc.AssertNoChange()
// Stop watcher, check closed.
testing.AssertStop(c, w)
wc.AssertClosed()
// Start a new watch, check Dead unit is reported.
w = s.unit.WatchSubordinateUnits()
defer testing.AssertStop(c, w)
wc = testing.NewStringsWatcherC(c, s.State, w)
wc.AssertChange(subUnits[0].Name())
wc.AssertNoChange()
// Remove the leftover, check no change.
err = subUnits[0].Remove()
c.Assert(err, gc.IsNil)
wc.AssertNoChange()
}