func NewTestEventEtcdRegistry(t *testing.T) (*tools.FakeEtcdClient, generic.Registry) {
	f := tools.NewFakeEtcdClient(t)
	f.TestIndex = true

	s := tools.NewEtcdStorage(f, testapi.Codec(), etcdtest.PathPrefix())
	return f, NewEtcdRegistry(s, testTTL)
}

func newStorage(t *testing.T) (*REST, *StatusREST, *tools.FakeEtcdClient, tools.StorageInterface) {
	fakeEtcdClient := tools.NewFakeEtcdClient(t)
	fakeEtcdClient.TestIndex = true
	etcdStorage := tools.NewEtcdStorage(fakeEtcdClient, latest.Codec, etcdtest.PathPrefix())
	storage, statusStorage := NewStorage(etcdStorage)
	return storage, statusStorage, fakeEtcdClient, etcdStorage
}

func NewTestEtcdRegistryWithPods(client tools.EtcdClient) *Registry {
	etcdStorage := tools.NewEtcdStorage(client, latest.Codec, etcdtest.PathPrefix())
	podStorage := podetcd.NewStorage(etcdStorage, nil)
	endpointStorage := endpointetcd.NewStorage(etcdStorage)
	registry := NewRegistry(etcdStorage, pod.NewRegistry(podStorage.Pod), endpoint.NewRegistry(endpointStorage))
	return registry
}

// NewEtcdStorage returns a StorageInterface for the provided arguments or an error if the version
// is incorrect.
func NewEtcdStorage(client tools.EtcdClient, version string, prefix string) (etcdStorage tools.StorageInterface, err error) {
	if version == "" {
		version = latest.Version
	}
	versionInterfaces, err := latest.InterfacesFor(version)
	if err != nil {
		return etcdStorage, err
	}
	return tools.NewEtcdStorage(client, versionInterfaces.Codec, prefix), nil
}

func TestWatch(t *testing.T) {
	client := framework.NewEtcdClient()
	etcdStorage := tools.NewEtcdStorage(client, testapi.Codec(), etcdtest.PathPrefix())
	framework.WithEtcdKey(func(key string) {
		key = etcdtest.AddPrefix(key)
		resp, err := client.Set(key, runtime.EncodeOrDie(testapi.Codec(), &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo"}}), 0)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		expectedVersion := resp.Node.ModifiedIndex

		// watch should load the object at the current index
		w, err := etcdStorage.Watch(key, 0, tools.Everything)
		if err != nil {
			t.Fatalf("Unexpected error: %v", err)
		}

		event := <-w.ResultChan()
		if event.Type != watch.Added || event.Object == nil {
			t.Fatalf("expected first value to be set to ADDED, got %#v", event)
		}

		// version should match what we set
		pod := event.Object.(*api.Pod)
		if pod.ResourceVersion != strconv.FormatUint(expectedVersion, 10) {
			t.Errorf("expected version %d, got %#v", expectedVersion, pod)
		}

		// should be no events in the stream
		select {
		case event, ok := <-w.ResultChan():
			if !ok {
				t.Fatalf("channel closed unexpectedly")
			}
			t.Fatalf("unexpected object in channel: %#v", event)
		default:
		}

		// should return the previously deleted item in the watch, but with the latest index
		resp, err = client.Delete(key, false)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		expectedVersion = resp.Node.ModifiedIndex
		event = <-w.ResultChan()
		if event.Type != watch.Deleted {
			t.Errorf("expected deleted event %#v", event)
		}
		pod = event.Object.(*api.Pod)
		if pod.ResourceVersion != strconv.FormatUint(expectedVersion, 10) {
			t.Errorf("expected version %d, got %#v", expectedVersion, pod)
		}
	})
}

func TestGetServersToValidate(t *testing.T) {
	master := Master{}
	config := Config{}
	fakeClient := tools.NewFakeEtcdClient(t)
	fakeClient.Machines = []string{"http://machine1:4001", "http://machine2", "http://machine3:4003"}
	config.DatabaseStorage = tools.NewEtcdStorage(fakeClient, latest.Codec, etcdtest.PathPrefix())

	master.nodeRegistry = registrytest.NewMinionRegistry([]string{"node1", "node2"}, api.NodeResources{})

	servers := master.getServersToValidate(&config)

	if len(servers) != 5 {
		t.Errorf("unexpected server list: %#v", servers)
	}
	for _, server := range []string{"scheduler", "controller-manager", "etcd-0", "etcd-1", "etcd-2"} {
		if _, ok := servers[server]; !ok {
			t.Errorf("server list missing: %s", server)
		}
	}
}

func TestSetObj(t *testing.T) {
	client := framework.NewEtcdClient()
	etcdStorage := tools.NewEtcdStorage(client, testapi.Codec(), "")
	framework.WithEtcdKey(func(key string) {
		testObject := api.ServiceAccount{ObjectMeta: api.ObjectMeta{Name: "foo"}}
		if err := etcdStorage.SetObj(key, &testObject, nil, 0); err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		resp, err := client.Get(key, false, false)
		if err != nil || resp.Node == nil {
			t.Fatalf("unexpected error: %v %v", err, resp)
		}
		decoded, err := testapi.Codec().Decode([]byte(resp.Node.Value))
		if err != nil {
			t.Fatalf("unexpected response: %#v", resp.Node)
		}
		result := *decoded.(*api.ServiceAccount)
		if !api.Semantic.DeepEqual(testObject, result) {
			t.Errorf("expected: %#v got: %#v", testObject, result)
		}
	})
}

func NewTestGenericEtcdRegistry(t *testing.T) (*tools.FakeEtcdClient, *Etcd) {
	f := tools.NewFakeEtcdClient(t)
	f.TestIndex = true
	s := tools.NewEtcdStorage(f, testapi.Codec(), etcdtest.PathPrefix())
	strategy := &testRESTStrategy{api.Scheme, api.SimpleNameGenerator, true, false, true}
	podPrefix := "/pods"
	return f, &Etcd{
		NewFunc:        func() runtime.Object { return &api.Pod{} },
		NewListFunc:    func() runtime.Object { return &api.PodList{} },
		EndpointName:   "pods",
		CreateStrategy: strategy,
		UpdateStrategy: strategy,
		KeyRootFunc: func(ctx api.Context) string {
			return podPrefix
		},
		KeyFunc: func(ctx api.Context, id string) (string, error) {
			return path.Join(podPrefix, id), nil
		},
		ObjectNameFunc: func(obj runtime.Object) (string, error) { return obj.(*api.Pod).Name, nil },
		Storage:        s,
	}
}

func TestExtractObj(t *testing.T) {
	client := framework.NewEtcdClient()
	etcdStorage := tools.NewEtcdStorage(client, testapi.Codec(), "")
	framework.WithEtcdKey(func(key string) {
		testObject := api.ServiceAccount{ObjectMeta: api.ObjectMeta{Name: "foo"}}
		coded, err := testapi.Codec().Encode(&testObject)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		_, err = client.Set(key, string(coded), 0)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		result := api.ServiceAccount{}
		if err := etcdStorage.ExtractObj(key, &result, false); err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		// Propagate ResourceVersion (it is set automatically).
		testObject.ObjectMeta.ResourceVersion = result.ObjectMeta.ResourceVersion
		if !api.Semantic.DeepEqual(testObject, result) {
			t.Errorf("expected: %#v got: %#v", testObject, result)
		}
	})
}

func newEtcdStorage(t *testing.T) (*tools.FakeEtcdClient, tools.StorageInterface) {
	fakeEtcdClient := tools.NewFakeEtcdClient(t)
	fakeEtcdClient.TestIndex = true
	etcdStorage := tools.NewEtcdStorage(fakeEtcdClient, latest.Codec, etcdtest.PathPrefix())
	return fakeEtcdClient, etcdStorage
}

func NewTestEtcdRegistry(client tools.EtcdClient) *Registry {
	storage := tools.NewEtcdStorage(client, latest.Codec, etcdtest.PathPrefix())
	registry := NewRegistry(storage, nil, nil)
	return registry
}