Function getRandomInstanceID

ring/ring_test.go:4564–4571

To make tests reproducible we sort the instance IDs in the map, and then get a random index via rnd.

(instances map[string]InstanceDesc, rnd *rand.Rand)

// To make tests reproducible we sort the instance IDs in the map, and then get a random index via rnd.
func getRandomInstanceID(instances map[string]InstanceDesc, rnd *rand.Rand) string {
	instanceIDs := make([]string, 0, len(instances))
	for id := range instances {
		instanceIDs = append(instanceIDs, id)
	}
	sort.Strings(instanceIDs)
	return instanceIDs[rnd.Intn(len(instanceIDs))]
}

type mockError struct {
	isClientErr bool