func (m *multiTestContext) Start(t *testing.T, numStores int) {
	if m.manualClock == nil {
		m.manualClock = hlc.NewManualClock(0)
	}
	if m.clock == nil {
		m.clock = hlc.NewClock(m.manualClock.UnixNano)
	}
	if m.gossip == nil {
		rpcContext := rpc.NewContext(m.clock, rpc.LoadInsecureTLSConfig())
		m.gossip = gossip.New(rpcContext, gossip.TestInterval, "")
	}
	if m.transport == nil {
		m.transport = multiraft.NewLocalRPCTransport()
	}
	if m.sender == nil {
		m.sender = kv.NewLocalSender()
	}
	if m.db == nil {
		txnSender := kv.NewTxnCoordSender(m.sender, m.clock, false)
		m.db = client.NewKV(txnSender, nil)
		m.db.User = storage.UserRoot
	}

	for i := 0; i < numStores; i++ {
		m.addStore(t)
	}
}

// createTestStoreWithEngine creates a test store using the given engine and clock.
// The caller is responsible for closing the store on exit.
func createTestStoreWithEngine(t *testing.T, eng engine.Engine, clock *hlc.Clock,
	bootstrap bool) *storage.Store {
	rpcContext := rpc.NewContext(hlc.NewClock(hlc.UnixNano), rpc.LoadInsecureTLSConfig())
	g := gossip.New(rpcContext, gossip.TestInterval, "")
	lSender := kv.NewLocalSender()
	sender := kv.NewTxnCoordSender(lSender, clock, false)
	db := client.NewKV(sender, nil)
	db.User = storage.UserRoot
	// TODO(bdarnell): arrange to have the transport closed.
	store := storage.NewStore(clock, eng, db, g, multiraft.NewLocalRPCTransport())
	if bootstrap {
		if err := store.Bootstrap(proto.StoreIdent{NodeID: 1, StoreID: 1}); err != nil {
			t.Fatal(err)
		}
	}
	lSender.AddStore(store)
	if bootstrap {
		if err := store.BootstrapRange(); err != nil {
			t.Fatal(err)
		}
	}
	if err := store.Start(); err != nil {
		t.Fatal(err)
	}
	return store
}

// createTestStoreWithEngine creates a test store using the given engine and clock.
// The caller is responsible for closing the store on exit.
func createTestStoreWithEngine(t *testing.T, eng engine.Engine, clock *hlc.Clock,
	bootstrap bool, context *storage.StoreContext) (*storage.Store, *stop.Stopper) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(&base.Context{}, hlc.NewClock(hlc.UnixNano), stopper)
	if context == nil {
		// make a copy
		ctx := storage.TestStoreContext
		context = &ctx
	}
	context.Gossip = gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	lSender := kv.NewLocalSender()
	sender := kv.NewTxnCoordSender(lSender, clock, false, nil, stopper)
	context.Clock = clock
	context.DB = client.NewDB(sender)
	context.Transport = multiraft.NewLocalRPCTransport(stopper)
	// TODO(bdarnell): arrange to have the transport closed.
	store := storage.NewStore(*context, eng, &proto.NodeDescriptor{NodeID: 1})
	if bootstrap {
		if err := store.Bootstrap(proto.StoreIdent{NodeID: 1, StoreID: 1}, stopper); err != nil {
			t.Fatal(err)
		}
	}
	lSender.AddStore(store)
	if bootstrap {
		if err := store.BootstrapRange(nil); err != nil {
			t.Fatal(err)
		}
	}
	if err := store.Start(stopper); err != nil {
		t.Fatal(err)
	}
	return store, stopper
}

// createTestNode creates an rpc server using the specified address,
// gossip instance, KV database and a node using the specified slice
// of engines. The server, clock and node are returned. If gossipBS is
// not nil, the gossip bootstrap address is set to gossipBS.
func createTestNode(addr net.Addr, engines []engine.Engine, gossipBS net.Addr, t *testing.T) (
	*rpc.Server, *hlc.Clock, *Node, *stop.Stopper) {
	ctx := storage.StoreContext{}

	stopper := stop.NewStopper()
	ctx.Clock = hlc.NewClock(hlc.UnixNano)
	nodeRPCContext := rpc.NewContext(nodeTestBaseContext, ctx.Clock, stopper)
	ctx.ScanInterval = 10 * time.Hour
	rpcServer := rpc.NewServer(addr, nodeRPCContext)
	if err := rpcServer.Start(); err != nil {
		t.Fatal(err)
	}
	g := gossip.New(nodeRPCContext, testContext.GossipInterval, testContext.GossipBootstrapResolvers)
	if gossipBS != nil {
		// Handle possibility of a :0 port specification.
		if gossipBS == addr {
			gossipBS = rpcServer.Addr()
		}
		g.SetResolvers([]resolver.Resolver{resolver.NewResolverFromAddress(gossipBS)})
		g.Start(rpcServer, stopper)
	}
	ctx.Gossip = g
	sender := kv.NewDistSender(&kv.DistSenderContext{Clock: ctx.Clock}, g)
	ctx.DB = client.NewDB(sender)
	// TODO(bdarnell): arrange to have the transport closed.
	// (or attach LocalRPCTransport.Close to the stopper)
	ctx.Transport = multiraft.NewLocalRPCTransport(stopper)
	ctx.EventFeed = util.NewFeed(stopper)
	node := NewNode(ctx)
	return rpcServer, ctx.Clock, node, stopper
}

// createCluster generates a new cluster using the provided stopper and the
// number of nodes supplied. Each node will have one store to start.
func createCluster(stopper *stop.Stopper, nodeCount int) *Cluster {
	rand, seed := randutil.NewPseudoRand()
	clock := hlc.NewClock(hlc.UnixNano)
	rpcContext := rpc.NewContext(&base.Context{}, clock, stopper)
	g := gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	storePool := storage.NewStorePool(g, storage.TestTimeUntilStoreDeadOff, stopper)
	c := &Cluster{
		stopper:       stopper,
		clock:         clock,
		rpc:           rpcContext,
		gossip:        g,
		storePool:     storePool,
		allocator:     storage.MakeAllocator(storePool, storage.RebalancingOptions{}),
		storeGossiper: gossiputil.NewStoreGossiper(g),
		nodes:         make(map[proto.NodeID]*Node),
		stores:        make(map[proto.StoreID]*Store),
		ranges:        make(map[proto.RangeID]*Range),
		rand:          rand,
		seed:          seed,
	}

	// Add the nodes.
	for i := 0; i < nodeCount; i++ {
		c.addNewNodeWithStore()
	}

	// Add a single range and add to this first node's first store.
	firstRange := c.addRange()
	firstRange.attachRangeToStore(c.stores[proto.StoreID(0)])
	return c
}

// createTestStoreWithEngine creates a test store using the given engine and clock.
// The caller is responsible for closing the store on exit.
func createTestStoreWithEngine(t *testing.T, eng engine.Engine, clock *hlc.Clock,
	bootstrap bool, sCtx *storage.StoreContext) (*storage.Store, *stop.Stopper) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(&base.Context{}, clock, stopper)
	if sCtx == nil {
		// make a copy
		ctx := storage.TestStoreContext
		sCtx = &ctx
	}
	nodeDesc := &proto.NodeDescriptor{NodeID: 1}
	sCtx.Gossip = gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	localSender := kv.NewLocalSender()
	rpcSend := func(_ rpc.Options, _ string, _ []net.Addr,
		getArgs func(addr net.Addr) gogoproto.Message, getReply func() gogoproto.Message,
		_ *rpc.Context) ([]gogoproto.Message, error) {
		call := proto.Call{
			Args:  getArgs(nil /* net.Addr */).(proto.Request),
			Reply: getReply().(proto.Response),
		}
		localSender.Send(context.Background(), call)
		return []gogoproto.Message{call.Reply}, call.Reply.Header().GoError()
	}

	// Mostly makes sure that we don't see a warning per request.
	{
		if err := sCtx.Gossip.AddInfoProto(gossip.MakeNodeIDKey(nodeDesc.NodeID), nodeDesc, time.Hour); err != nil {
			t.Fatal(err)
		}
		if err := sCtx.Gossip.SetNodeDescriptor(nodeDesc); err != nil {
			t.Fatal(err)
		}
	}
	distSender := kv.NewDistSender(&kv.DistSenderContext{
		Clock:             clock,
		RPCSend:           rpcSend,     // defined above
		RangeDescriptorDB: localSender, // for descriptor lookup
	}, sCtx.Gossip)

	sender := kv.NewTxnCoordSender(distSender, clock, false, nil, stopper)
	sCtx.Clock = clock
	sCtx.DB = client.NewDB(sender)
	sCtx.Transport = multiraft.NewLocalRPCTransport(stopper)
	// TODO(bdarnell): arrange to have the transport closed.
	store := storage.NewStore(*sCtx, eng, nodeDesc)
	if bootstrap {
		if err := store.Bootstrap(proto.StoreIdent{NodeID: 1, StoreID: 1}, stopper); err != nil {
			t.Fatal(err)
		}
	}
	localSender.AddStore(store)
	if bootstrap {
		if err := store.BootstrapRange(sql.GetInitialSystemValues()); err != nil {
			t.Fatal(err)
		}
	}
	if err := store.Start(stopper); err != nil {
		t.Fatal(err)
	}
	return store, stopper
}

// createTestStoreWithoutStart creates a test store using an in-memory
// engine without starting the store. It returns the store, the store
// clock's manual unix nanos time and a stopper. The caller is
// responsible for stopping the stopper upon completion.
func createTestStoreWithoutStart(t *testing.T) (*Store, *hlc.ManualClock, *stop.Stopper) {
	stopper := stop.NewStopper()
	// Setup fake zone config handler.
	config.TestingSetupZoneConfigHook(stopper)
	rpcContext := rpc.NewContext(&base.Context{}, hlc.NewClock(hlc.UnixNano), stopper)
	ctx := TestStoreContext
	ctx.Gossip = gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	ctx.StorePool = NewStorePool(ctx.Gossip, TestTimeUntilStoreDeadOff, stopper)
	manual := hlc.NewManualClock(0)
	ctx.Clock = hlc.NewClock(manual.UnixNano)
	eng := engine.NewInMem(roachpb.Attributes{}, 10<<20, stopper)
	ctx.Transport = multiraft.NewLocalRPCTransport(stopper)
	stopper.AddCloser(ctx.Transport)
	sender := &testSender{}
	ctx.DB = client.NewDB(sender)
	store := NewStore(ctx, eng, &roachpb.NodeDescriptor{NodeID: 1})
	sender.store = store
	if err := store.Bootstrap(roachpb.StoreIdent{NodeID: 1, StoreID: 1}, stopper); err != nil {
		t.Fatal(err)
	}
	if err := store.BootstrapRange(nil); err != nil {
		t.Fatal(err)
	}
	return store, manual, stopper
}

// createTestNode creates an rpc server using the specified address,
// gossip instance, KV database and a node using the specified slice
// of engines. The server and node are returned. If gossipBS is not
// nil, the gossip bootstrap address is set to gossipBS.
func createTestNode(addr net.Addr, engines []engine.Engine, gossipBS net.Addr, t *testing.T) (
	*rpc.Server, *Node) {
	tlsConfig, err := rpc.LoadTestTLSConfig("..")
	if err != nil {
		t.Fatal(err)
	}

	rpcServer := rpc.NewServer(addr, tlsConfig)
	if err := rpcServer.Start(); err != nil {
		t.Fatal(err)
	}
	g := gossip.New(tlsConfig)
	if gossipBS != nil {
		// Handle possibility of a :0 port specification.
		if gossipBS == addr {
			gossipBS = rpcServer.Addr()
		}
		g.SetBootstrap([]net.Addr{gossipBS})
		g.Start(rpcServer)
	}
	clock := hlc.NewClock(hlc.UnixNano)
	db := kv.NewDB(kv.NewDistKV(g), clock)
	node := NewNode(db, g)
	if err := node.start(rpcServer, clock, engines, proto.Attributes{}); err != nil {
		t.Fatal(err)
	}
	return rpcServer, node
}

func newServer() (*server, error) {
	// Determine hostname in case it hasn't been specified in -rpc or -http.
	host, err := os.Hostname()
	if err != nil {
		host = "127.0.0.1"
	}

	// Resolve
	if strings.HasPrefix(*rpcAddr, ":") {
		*rpcAddr = host + *rpcAddr
	}
	addr, err := net.ResolveTCPAddr("tcp", *rpcAddr)
	if err != nil {
		return nil, util.Errorf("unable to resolve RPC address %q: %v", *rpcAddr, err)
	}

	s := &server{
		host: host,
		mux:  http.NewServeMux(),
		rpc:  rpc.NewServer(addr),
	}

	s.gossip = gossip.New()
	s.kvDB = kv.NewDB(s.gossip)
	s.kvREST = rest.NewRESTServer(s.kvDB)
	s.node = NewNode(s.kvDB, s.gossip)
	s.admin = newAdminServer(s.kvDB)
	s.status = newStatusServer(s.kvDB)
	s.structuredDB = structured.NewDB(s.kvDB)
	s.structuredREST = structured.NewRESTServer(s.structuredDB)

	return s, nil
}

// createTestStorePool creates a stopper, gossip and storePool for use in
// tests. Stopper must be stopped by the caller.
func createTestStorePool(timeUntilStoreDead time.Duration) (*stop.Stopper, *gossip.Gossip, *StorePool) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(&base.Context{}, hlc.NewClock(hlc.UnixNano), stopper)
	g := gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	storePool := NewStorePool(g, timeUntilStoreDead, stopper)
	return stopper, g, storePool
}

func gossipForTest(t *testing.T) (*gossip.Gossip, *stop.Stopper) {
	stopper := stop.NewStopper()

	// Setup fake zone config handler.
	config.TestingSetupZoneConfigHook(stopper)

	rpcContext := rpc.NewContext(nil, nil, stopper)
	g := gossip.New(rpcContext, nil, stopper)
	// Have to call g.SetNodeID before call g.AddInfo
	g.SetNodeID(roachpb.NodeID(1))
	// Put an empty system config into gossip.
	if err := g.AddInfoProto(gossip.KeySystemConfig,
		&config.SystemConfig{}, 0); err != nil {
		t.Fatal(err)
	}

	// Wait for SystemConfig.
	util.SucceedsSoon(t, func() error {
		if _, ok := g.GetSystemConfig(); !ok {
			return util.Errorf("expected system config to be set")
		}
		return nil
	})

	return g, stopper
}

func gossipForTest(t *testing.T) (*gossip.Gossip, *stop.Stopper) {
	stopper := stop.NewStopper()

	// Setup fake zone config handler.
	config.TestingSetupZoneConfigHook(stopper)

	rpcContext := rpc.NewContext(&base.Context{}, hlc.NewClock(hlc.UnixNano), stopper)
	g := gossip.New(rpcContext, gossip.TestBootstrap, stopper)
	// Have to call g.SetNodeID before call g.AddInfo
	g.SetNodeID(roachpb.NodeID(1))
	// Put an empty system config into gossip.
	if err := g.AddInfoProto(gossip.KeySystemConfig,
		&config.SystemConfig{}, 0); err != nil {
		t.Fatal(err)
	}

	// Wait for SystemConfig.
	util.SucceedsSoon(t, func() error {
		if g.GetSystemConfig() == nil {
			return util.Errorf("expected non-nil system config")
		}
		return nil
	})

	return g, stopper
}

// createTestStoreWithoutStart creates a test store using an in-memory
// engine without starting the store. It returns the store, the store
// clock's manual unix nanos time and a stopper. The caller is
// responsible for stopping the stopper upon completion.
func createTestStoreWithoutStart(t *testing.T) (*Store, *hlc.ManualClock, *stop.Stopper) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(rootTestBaseContext, hlc.NewClock(hlc.UnixNano), stopper)
	ctx := TestStoreContext
	ctx.Gossip = gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	manual := hlc.NewManualClock(0)
	ctx.Clock = hlc.NewClock(manual.UnixNano)
	eng := engine.NewInMem(proto.Attributes{}, 10<<20)
	ctx.Transport = multiraft.NewLocalRPCTransport()
	stopper.AddCloser(ctx.Transport)
	sender := &testSender{}
	var err error
	if ctx.DB, err = client.Open("//[email protected]", client.SenderOpt(sender)); err != nil {
		t.Fatal(err)
	}
	store := NewStore(ctx, eng, &proto.NodeDescriptor{NodeID: 1})
	sender.store = store
	if err := store.Bootstrap(proto.StoreIdent{NodeID: 1, StoreID: 1}, stopper); err != nil {
		t.Fatal(err)
	}
	if err := store.BootstrapRange(); err != nil {
		t.Fatal(err)
	}
	return store, manual, stopper
}

func gossipForTest(t *testing.T) (*gossip.Gossip, *stop.Stopper) {
	stopper := stop.NewStopper()

	// Setup fake zone config handler.
	config.TestingSetupZoneConfigHook(stopper)

	rpcContext := rpc.NewContext(&base.Context{}, hlc.NewClock(hlc.UnixNano), stopper)
	g := gossip.New(rpcContext, gossip.TestBootstrap)
	// Have to call g.SetNodeID before call g.AddInfo
	g.SetNodeID(roachpb.NodeID(1))
	// Put an empty system config into gossip.
	if err := g.AddInfoProto(gossip.KeySystemConfig,
		&config.SystemConfig{}, 0); err != nil {
		t.Fatal(err)
	}

	// Wait for SystemConfig.
	if err := util.IsTrueWithin(func() bool {
		return g.GetSystemConfig() != nil
	}, 100*time.Millisecond); err != nil {
		t.Fatal(err)
	}

	return g, stopper
}

// Start starts the test cluster by bootstrapping an in-memory store
// (defaults to maximum of 50M). The server is started, launching the
// node RPC server and all HTTP endpoints. Use the value of
// TestServer.Addr after Start() for client connections. Use Stop()
// to shutdown the server after the test completes.
func (ltc *LocalTestCluster) Start(t util.Tester) {
	ltc.Manual = hlc.NewManualClock(0)
	ltc.Clock = hlc.NewClock(ltc.Manual.UnixNano)
	ltc.Stopper = stop.NewStopper()
	rpcContext := rpc.NewContext(testutils.NewRootTestBaseContext(), ltc.Clock, ltc.Stopper)
	ltc.Gossip = gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	ltc.Eng = engine.NewInMem(proto.Attributes{}, 50<<20)
	ltc.lSender = newRetryableLocalSender(NewLocalSender())
	ltc.Sender = NewTxnCoordSender(ltc.lSender, ltc.Clock, false, nil, ltc.Stopper)
	var err error
	if ltc.DB, err = client.Open("//[email protected]", client.SenderOpt(ltc.Sender)); err != nil {
		t.Fatal(err)
	}
	transport := multiraft.NewLocalRPCTransport(ltc.Stopper)
	ltc.Stopper.AddCloser(transport)
	ctx := storage.TestStoreContext
	ctx.Clock = ltc.Clock
	ctx.DB = ltc.DB
	ctx.Gossip = ltc.Gossip
	ctx.Transport = transport
	ltc.Store = storage.NewStore(ctx, ltc.Eng, &proto.NodeDescriptor{NodeID: 1})
	if err := ltc.Store.Bootstrap(proto.StoreIdent{NodeID: 1, StoreID: 1}, ltc.Stopper); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	ltc.lSender.AddStore(ltc.Store)
	if err := ltc.Store.BootstrapRange(nil); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	if err := ltc.Store.Start(ltc.Stopper); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
}

// Start starts the test cluster by bootstrapping an in-memory store
// (defaults to maximum of 50M). The server is started, launching the
// node RPC server and all HTTP endpoints. Use the value of
// TestServer.Addr after Start() for client connections. Use Stop()
// to shutdown the server after the test completes.
func (ltc *LocalTestCluster) Start(t util.Tester) {

	nodeDesc := &proto.NodeDescriptor{NodeID: 1}
	ltc.tester = t
	ltc.Manual = hlc.NewManualClock(0)
	ltc.Clock = hlc.NewClock(ltc.Manual.UnixNano)
	ltc.Stopper = stop.NewStopper()
	rpcContext := rpc.NewContext(testutils.NewNodeTestBaseContext(), ltc.Clock, ltc.Stopper)
	ltc.Gossip = gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	ltc.Eng = engine.NewInMem(proto.Attributes{}, 50<<20, ltc.Stopper)

	ltc.localSender = NewLocalSender()
	var rpcSend rpcSendFn = func(_ rpc.Options, _ string, _ []net.Addr,
		getArgs func(addr net.Addr) gogoproto.Message, getReply func() gogoproto.Message,
		_ *rpc.Context) ([]gogoproto.Message, error) {
		// TODO(tschottdorf): remove getReply().
		br, pErr := ltc.localSender.Send(context.Background(), *getArgs(nil).(*proto.BatchRequest))
		if br == nil {
			br = &proto.BatchResponse{}
		}
		if br.Error != nil {
			panic(proto.ErrorUnexpectedlySet(ltc.localSender, br))
		}
		br.Error = pErr
		return []gogoproto.Message{br}, nil
	}
	ltc.distSender = NewDistSender(&DistSenderContext{
		Clock: ltc.Clock,
		RangeDescriptorCacheSize: defaultRangeDescriptorCacheSize,
		RangeLookupMaxRanges:     defaultRangeLookupMaxRanges,
		LeaderCacheSize:          defaultLeaderCacheSize,
		RPCRetryOptions:          &defaultRPCRetryOptions,
		nodeDescriptor:           nodeDesc,
		RPCSend:                  rpcSend,         // defined above
		RangeDescriptorDB:        ltc.localSender, // for descriptor lookup
	}, ltc.Gossip)

	ltc.Sender = NewTxnCoordSender(ltc.distSender, ltc.Clock, false /* !linearizable */, nil /* tracer */, ltc.Stopper)
	ltc.DB = client.NewDB(ltc.Sender)

	transport := multiraft.NewLocalRPCTransport(ltc.Stopper)
	ltc.Stopper.AddCloser(transport)
	ctx := storage.TestStoreContext
	ctx.Clock = ltc.Clock
	ctx.DB = ltc.DB
	ctx.Gossip = ltc.Gossip
	ctx.Transport = transport
	ltc.Store = storage.NewStore(ctx, ltc.Eng, nodeDesc)
	if err := ltc.Store.Bootstrap(proto.StoreIdent{NodeID: 1, StoreID: 1}, ltc.Stopper); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	ltc.localSender.AddStore(ltc.Store)
	if err := ltc.Store.BootstrapRange(nil); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	if err := ltc.Store.Start(ltc.Stopper); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
}

// createTestAllocator creates a stopper, gossip, store pool and allocator for
// use in tests. Stopper must be stopped by the caller.
func createTestAllocator() (*stop.Stopper, *gossip.Gossip, *StorePool, Allocator) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(&base.Context{}, hlc.NewClock(hlc.UnixNano), stopper)
	g := gossip.New(rpcContext, gossip.TestBootstrap)
	storePool := NewStorePool(g, TestTimeUntilStoreDeadOff, stopper)
	a := MakeAllocator(storePool, RebalancingOptions{AllowRebalance: true})
	return stopper, g, storePool, a
}

// createTestAllocator creates a stopper, gossip, store pool and allocator for
// use in tests. Stopper must be stopped by the caller.
func createTestAllocator() (*stop.Stopper, *gossip.Gossip, *StorePool, allocator) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(&base.Context{}, hlc.NewClock(hlc.UnixNano), stopper)
	g := gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	storePool := NewStorePool(g, TestTimeUntilStoreDeadOff, stopper)
	a := makeAllocator(storePool)
	return stopper, g, storePool, a
}

func (m *multiTestContext) Start(t *testing.T, numStores int) {
	m.t = t
	if m.manualClock == nil {
		m.manualClock = hlc.NewManualClock(0)
	}
	if m.clock == nil {
		m.clock = hlc.NewClock(m.manualClock.UnixNano)
	}
	if m.gossip == nil {
		rpcContext := rpc.NewContext(&base.Context{}, m.clock, nil)
		m.gossip = gossip.New(rpcContext, gossip.TestInterval, gossip.TestBootstrap)
	}
	if m.clientStopper == nil {
		m.clientStopper = stop.NewStopper()
	}
	if m.transport == nil {
		m.transport = multiraft.NewLocalRPCTransport(m.clientStopper)
	}
	if m.storePool == nil {
		if m.timeUntilStoreDead == 0 {
			m.timeUntilStoreDead = storage.TestTimeUntilStoreDeadOff
		}
		m.storePool = storage.NewStorePool(m.gossip, m.timeUntilStoreDead, m.clientStopper)
	}

	// Always create the first sender.
	m.senders = append(m.senders, kv.NewLocalSender())

	rpcSend := func(_ rpc.Options, _ string, _ []net.Addr,
		getArgs func(addr net.Addr) gogoproto.Message, getReply func() gogoproto.Message,
		_ *rpc.Context) ([]gogoproto.Message, error) {
		call := proto.Call{
			Args:  getArgs(nil /* net.Addr */).(proto.Request),
			Reply: getReply().(proto.Response),
		}
		m.senders[0].Send(context.Background(), call)
		return []gogoproto.Message{call.Reply}, call.Reply.Header().GoError()
	}

	if m.db == nil {
		distSender := kv.NewDistSender(&kv.DistSenderContext{
			Clock:             m.clock,
			RangeDescriptorDB: m.senders[0],
			RPCSend:           rpcSend,
		}, m.gossip)
		sender := kv.NewTxnCoordSender(distSender, m.clock, false, nil, m.clientStopper)
		m.db = client.NewDB(sender)
	}

	for i := 0; i < numStores; i++ {
		m.addStore()
	}
	if m.transportStopper == nil {
		m.transportStopper = stop.NewStopper()
	}
	m.transportStopper.AddCloser(m.transport)
}

// createTestStorePool creates a stopper, gossip and storePool for use in
// tests. Stopper must be stopped by the caller.
func createTestStorePool(timeUntilStoreDead time.Duration) (*stop.Stopper, *gossip.Gossip, *StorePool) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(&base.Context{}, hlc.NewClock(hlc.UnixNano), stopper)
	g := gossip.New(rpcContext, gossip.TestBootstrap)
	// Have to call g.SetNodeID before call g.AddInfo
	g.SetNodeID(roachpb.NodeID(1))
	storePool := NewStorePool(g, timeUntilStoreDead, stopper)
	return stopper, g, storePool
}