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[modules]: add test for ordered shutdown #240

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[modules]: add test for ordered shutdown #240

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081bbdc
[modules]: add test for ordered shutdown
zalegrala Dec 2, 2022
5483292
Close the chan for testing shutdown order
zalegrala Jan 27, 2023
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21 changes: 19 additions & 2 deletions modules/modules_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,13 @@ import (

func mockInitFunc() (services.Service, error) { return services.NewIdleService(nil, nil), nil }

func mockStoppingFunc(id string, stopChan chan string) services.StoppingFn {
return func(_ error) error {
stopChan <- id
return nil
}
}

func mockInitFuncFail() (services.Service, error) { return nil, errors.New("Error") }

func TestDependencies(t *testing.T) {
Expand Down Expand Up @@ -277,13 +284,15 @@ func TestManager_inverseDependenciesForModule(t *testing.T) {
func TestModuleWaitsForAllDependencies(t *testing.T) {
var serviceA services.Service

stopChanOrder := make(chan string, 2)

initA := func() (services.Service, error) {
serviceA = services.NewIdleService(func(serviceContext context.Context) error {
// Slow-starting service. Delay is here to verify that service for C is not started before this service
// has finished starting.
time.Sleep(1 * time.Second)
return nil
}, nil)
}, mockStoppingFunc("a", stopChanOrder))

return serviceA, nil
}
Expand All @@ -295,7 +304,7 @@ func TestModuleWaitsForAllDependencies(t *testing.T) {
return fmt.Errorf("serviceA has invalid state: %v", s)
}
return nil
}, nil), nil
}, mockStoppingFunc("c", stopChanOrder)), nil
}

m := NewManager(log.NewNopLogger())
Expand All @@ -320,6 +329,14 @@ func TestModuleWaitsForAllDependencies(t *testing.T) {
require.NoError(t, err)
assert.NoError(t, services.StartManagerAndAwaitHealthy(context.Background(), servManager))
assert.NoError(t, services.StopManagerAndAwaitStopped(context.Background(), servManager))

expectedStopOrder := []string{"c", "a"}

close(stopChanOrder)

for i, stopID := range <-stopChanOrder {
assert.Equal(t, expectedStopOrder[i], string(stopID))
}
}

func getStopDependenciesForModule(module string, services map[string]services.Service) []string {
Expand Down