func TestProposerSelection0(t *testing.T) {
	cs1, vss := randConsensusState(4)
	height, round := cs1.Height, cs1.Round

	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)
	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)

	startTestRound(cs1, height, round)

	// wait for new round so proposer is set
	<-newRoundCh

	// lets commit a block and ensure proposer for the next height is correct
	prop := cs1.GetRoundState().Validators.Proposer()
	if !bytes.Equal(prop.Address, cs1.privValidator.Address) {
		t.Fatalf("expected proposer to be validator %d. Got %X", 0, prop.Address)
	}

	// wait for complete proposal
	<-proposalCh

	rs := cs1.GetRoundState()
	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, rs.ProposalBlock.Hash(), rs.ProposalBlockParts.Header(), vss[1:]...)

	// wait for new round so next validator is set
	<-newRoundCh

	prop = cs1.GetRoundState().Validators.Proposer()
	if !bytes.Equal(prop.Address, vss[1].Address) {
		t.Fatalf("expected proposer to be validator %d. Got %X", 1, prop.Address)
	}
}

// propose, prevote, and precommit a block
func TestFullRound1(t *testing.T) {
	cs, vss := randConsensusState(1)
	height, round := cs.Height, cs.Round

	voteCh := subscribeToEvent(cs.evsw, "tester", types.EventStringVote(), 1)
	propCh := subscribeToEvent(cs.evsw, "tester", types.EventStringCompleteProposal(), 1)
	newRoundCh := subscribeToEvent(cs.evsw, "tester", types.EventStringNewRound(), 1)

	startTestRound(cs, height, round)

	<-newRoundCh

	// grab proposal
	re := <-propCh
	propBlockHash := re.(types.EventDataRoundState).RoundState.(*RoundState).ProposalBlock.Hash()

	<-voteCh // wait for prevote
	validatePrevote(t, cs, round, vss[0], propBlockHash)

	<-voteCh // wait for precommit

	// we're going to roll right into new height
	<-newRoundCh

	validateLastPrecommit(t, cs, vss[0], propBlockHash)
}

// a validator should not timeout of the prevote round (TODO: unless the block is really big!)
func TestEnterProposeYesPrivValidator(t *testing.T) {
	cs, _ := randConsensusState(1)
	height, round := cs.Height, cs.Round

	// Listen for propose timeout event

	timeoutCh := subscribeToEvent(cs.evsw, "tester", types.EventStringTimeoutPropose(), 1)
	proposalCh := subscribeToEvent(cs.evsw, "tester", types.EventStringCompleteProposal(), 1)

	cs.enterNewRound(height, round)
	cs.startRoutines(3)

	<-proposalCh

	// Check that Proposal, ProposalBlock, ProposalBlockParts are set.
	rs := cs.GetRoundState()
	if rs.Proposal == nil {
		t.Error("rs.Proposal should be set")
	}
	if rs.ProposalBlock == nil {
		t.Error("rs.ProposalBlock should be set")
	}
	if rs.ProposalBlockParts.Total() == 0 {
		t.Error("rs.ProposalBlockParts should be set")
	}

	// if we're a validator, enterPropose should not timeout
	ticker := time.NewTicker(timeoutPropose0 * 2)
	select {
	case <-timeoutCh:
		t.Fatal("Expected EnterPropose not to timeout")
	case <-ticker.C:

	}
}

// Enter: `timeoutPropose` after entering Propose.
// Enter: proposal block and POL is ready.
// Enter: any +2/3 prevotes for future round.
// Prevote for LockedBlock if we're locked, or ProposalBlock if valid.
// Otherwise vote nil.
func (cs *ConsensusState) EnterPrevote(height int, round int, timedOut bool) {
	cs.mtx.Lock()
	defer cs.mtx.Unlock()
	if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrevote <= cs.Step) {
		log.Debug(Fmt("EnterPrevote(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
		return
	}

	// fire event for how we got here
	if timedOut {
		cs.evsw.FireEvent(types.EventStringTimeoutPropose(), cs.RoundStateEvent())
	} else if cs.isProposalComplete() {
		cs.evsw.FireEvent(types.EventStringCompleteProposal(), cs.RoundStateEvent())
	} else {
		// we received +2/3 prevotes for a future round
		// TODO: catchup event?
	}

	log.Info(Fmt("EnterPrevote(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))

	// Sign and broadcast vote as necessary
	cs.doPrevote(height, round)

	// Done EnterPrevote:
	cs.Round = round
	cs.Step = RoundStepPrevote
	cs.newStepCh <- cs.getRoundState()

	// Once `addVote` hits any +2/3 prevotes, we will go to PrevoteWait
	// (so we have more time to try and collect +2/3 prevotes for a single block)
}

// Enter: `timeoutPropose` after entering Propose.
// Enter: proposal block and POL is ready.
// Enter: any +2/3 prevotes for future round.
// Prevote for LockedBlock if we're locked, or ProposalBlock if valid.
// Otherwise vote nil.
func (cs *ConsensusState) enterPrevote(height int, round int) {
	if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrevote <= cs.Step) {
		log.Debug(Fmt("enterPrevote(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
		return
	}

	defer func() {
		// Done enterPrevote:
		cs.updateRoundStep(round, RoundStepPrevote)
		cs.newStep()
	}()

	// fire event for how we got here
	if cs.isProposalComplete() {
		cs.evsw.FireEvent(types.EventStringCompleteProposal(), cs.RoundStateEvent())
	} else {
		// we received +2/3 prevotes for a future round
		// TODO: catchup event?
	}

	// cs.stopTimer()

	log.Info(Fmt("enterPrevote(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))

	// Sign and broadcast vote as necessary
	cs.doPrevote(height, round)

	// Once `addVote` hits any +2/3 prevotes, we will go to PrevoteWait
	// (so we have more time to try and collect +2/3 prevotes for a single block)
}

func TestBadProposal(t *testing.T) {
	cs1, vss := randConsensusState(2)
	height, round := cs1.Height, cs1.Round
	cs2 := vss[1]

	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	voteCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringVote(), 1)

	propBlock, _ := cs1.createProposalBlock() //changeProposer(t, cs1, cs2)

	// make the second validator the proposer by incrementing round
	round = round + 1
	incrementRound(vss[1:]...)

	// make the block bad by tampering with statehash
	stateHash := propBlock.AppHash
	if len(stateHash) == 0 {
		stateHash = make([]byte, 32)
	}
	stateHash[0] = byte((stateHash[0] + 1) % 255)
	propBlock.AppHash = stateHash
	propBlockParts := propBlock.MakePartSet()
	proposal := types.NewProposal(cs2.Height, round, propBlockParts.Header(), -1)
	if err := cs2.SignProposal(chainID, proposal); err != nil {
		t.Fatal("failed to sign bad proposal", err)
	}

	// set the proposal block
	cs1.SetProposalAndBlock(proposal, propBlock, propBlockParts, "some peer")

	// start the machine
	startTestRound(cs1, height, round)

	// wait for proposal
	<-proposalCh

	// wait for prevote
	<-voteCh

	validatePrevote(t, cs1, round, vss[0], nil)

	// add bad prevote from cs2 and wait for it
	signAddVoteToFrom(types.VoteTypePrevote, cs1, cs2, propBlock.Hash(), propBlock.MakePartSet().Header())
	<-voteCh

	// wait for precommit
	<-voteCh

	validatePrecommit(t, cs1, round, 0, vss[0], nil, nil)
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs2, propBlock.Hash(), propBlock.MakePartSet().Header())
}

// 4 vals.
// we receive a final precommit after going into next round, but others might have gone to commit already!
func TestHalt1(t *testing.T) {
	cs1, vss := randConsensusState(4)
	cs2, cs3, cs4 := vss[1], vss[2], vss[3]

	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)
	newBlockCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewBlock(), 1)
	voteCh := subscribeToVoter(cs1, cs1.privValidator.Address)

	// start round and wait for propose and prevote
	startTestRound(cs1, cs1.Height, 0)
	<-newRoundCh
	re := <-proposalCh
	rs := re.(types.EventDataRoundState).RoundState.(*RoundState)
	propBlock := rs.ProposalBlock
	propBlockParts := propBlock.MakePartSet()

	<-voteCh // prevote

	signAddVoteToFromMany(types.VoteTypePrevote, cs1, propBlock.Hash(), propBlockParts.Header(), cs3, cs4)
	<-voteCh // precommit

	// the proposed block should now be locked and our precommit added
	validatePrecommit(t, cs1, 0, 0, vss[0], propBlock.Hash(), propBlock.Hash())

	// add precommits from the rest
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs2, nil, types.PartSetHeader{}) // didnt receive proposal
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs3, propBlock.Hash(), propBlockParts.Header())
	// we receive this later, but cs3 might receive it earlier and with ours will go to commit!
	precommit4 := signVote(cs4, types.VoteTypePrecommit, propBlock.Hash(), propBlockParts.Header())

	incrementRound(cs2, cs3, cs4)

	// timeout to new round
	<-timeoutWaitCh
	re = <-newRoundCh
	rs = re.(types.EventDataRoundState).RoundState.(*RoundState)

	log.Notice("### ONTO ROUND 1")
	/*Round2
	// we timeout and prevote our lock
	// a polka happened but we didn't see it!
	*/

	// go to prevote, prevote for locked block
	<-voteCh // prevote
	validatePrevote(t, cs1, 0, vss[0], rs.LockedBlock.Hash())

	// now we receive the precommit from the previous round
	addVoteToFrom(cs1, cs4, precommit4)

	// receiving that precommit should take us straight to commit
	<-newBlockCh
	re = <-newRoundCh
	rs = re.(types.EventDataRoundState).RoundState.(*RoundState)

	if rs.Height != 2 {
		t.Fatal("expected height to increment")
	}
}

// What we want:
// dont see P0, lock on P1 at R1, dont unlock using P0 at R2
func TestLockPOLSafety2(t *testing.T) {
	cs1, vss := randConsensusState(4)
	cs2, cs3, cs4 := vss[1], vss[2], vss[3]

	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)
	unlockCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringUnlock(), 1)
	voteCh := subscribeToVoter(cs1, cs1.privValidator.Address)

	// the block for R0: gets polkad but we miss it
	// (even though we signed it, shhh)
	_, propBlock0 := decideProposal(cs1, vss[0], cs1.Height, cs1.Round)
	propBlockHash0 := propBlock0.Hash()
	propBlockParts0 := propBlock0.MakePartSet()

	// the others sign a polka but we don't see it
	prevotes := signVoteMany(types.VoteTypePrevote, propBlockHash0, propBlockParts0.Header(), cs2, cs3, cs4)

	// the block for round 1
	prop1, propBlock1 := decideProposal(cs1, cs2, cs2.Height, cs2.Round+1)
	propBlockHash1 := propBlock1.Hash()
	propBlockParts1 := propBlock1.MakePartSet()

	incrementRound(cs2, cs3, cs4)

	cs1.updateRoundStep(0, RoundStepPrecommitWait)

	log.Notice("### ONTO Round 1")
	// jump in at round 1
	height := cs1.Height
	startTestRound(cs1, height, 1)
	<-newRoundCh

	cs1.SetProposalAndBlock(prop1, propBlock1, propBlockParts1, "some peer")
	<-proposalCh

	<-voteCh // prevote

	signAddVoteToFromMany(types.VoteTypePrevote, cs1, propBlockHash1, propBlockParts1.Header(), cs2, cs3, cs4)

	<-voteCh // precommit
	// the proposed block should now be locked and our precommit added
	validatePrecommit(t, cs1, 1, 1, vss[0], propBlockHash1, propBlockHash1)

	// add precommits from the rest
	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs4)
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs3, propBlockHash1, propBlockParts1.Header())

	incrementRound(cs2, cs3, cs4)

	// timeout of precommit wait to new round
	<-timeoutWaitCh

	// in round 2 we see the polkad block from round 0
	newProp := types.NewProposal(height, 2, propBlockParts0.Header(), 0)
	if err := cs3.SignProposal(chainID, newProp); err != nil {
		t.Fatal(err)
	}
	cs1.SetProposalAndBlock(newProp, propBlock0, propBlockParts0, "some peer")
	addVoteToFromMany(cs1, prevotes, cs2, cs3, cs4) // add the pol votes

	<-newRoundCh
	log.Notice("### ONTO Round 2")
	/*Round2
	// now we see the polka from round 1, but we shouldnt unlock
	*/

	select {
	case <-timeoutProposeCh:
		<-proposalCh
	case <-proposalCh:
	}

	select {
	case <-unlockCh:
		t.Fatal("validator unlocked using an old polka")
	case <-voteCh:
		// prevote our locked block
	}
	validatePrevote(t, cs1, 2, vss[0], propBlockHash1)

}

// 4 vals
// a polka at round 1 but we miss it
// then a polka at round 2 that we lock on
// then we see the polka from round 1 but shouldn't unlock
func TestLockPOLSafety1(t *testing.T) {
	cs1, vss := randConsensusState(4)
	cs2, cs3, cs4 := vss[1], vss[2], vss[3]

	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)
	voteCh := subscribeToVoter(cs1, cs1.privValidator.Address)

	// start round and wait for propose and prevote
	startTestRound(cs1, cs1.Height, 0)
	<-newRoundCh
	re := <-proposalCh
	rs := re.(types.EventDataRoundState).RoundState.(*RoundState)
	propBlock := rs.ProposalBlock

	<-voteCh // prevote

	validatePrevote(t, cs1, 0, vss[0], propBlock.Hash())

	// the others sign a polka but we don't see it
	prevotes := signVoteMany(types.VoteTypePrevote, propBlock.Hash(), propBlock.MakePartSet().Header(), cs2, cs3, cs4)

	// before we time out into new round, set next proposer
	// and next proposal block
	/*
		_, v1 := cs1.Validators.GetByAddress(vss[0].Address)
		v1.VotingPower = 1
		if updated := cs1.Validators.Update(v1); !updated {
			t.Fatal("failed to update validator")
		}*/

	log.Warn("old prop", "hash", fmt.Sprintf("%X", propBlock.Hash()))

	// we do see them precommit nil
	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs3, cs4)

	prop, propBlock := decideProposal(cs1, cs2, cs2.Height, cs2.Round+1)
	propBlockHash := propBlock.Hash()
	propBlockParts := propBlock.MakePartSet()

	incrementRound(cs2, cs3, cs4)

	//XXX: this isnt gauranteed to get there before the timeoutPropose ...
	cs1.SetProposalAndBlock(prop, propBlock, propBlockParts, "some peer")

	<-newRoundCh
	log.Notice("### ONTO ROUND 1")
	/*Round2
	// we timeout and prevote our lock
	// a polka happened but we didn't see it!
	*/

	// now we're on a new round and not the proposer,
	// but we should receive the proposal
	select {
	case re = <-proposalCh:
	case <-timeoutProposeCh:
		re = <-proposalCh
	}

	rs = re.(types.EventDataRoundState).RoundState.(*RoundState)

	if rs.LockedBlock != nil {
		t.Fatal("we should not be locked!")
	}
	log.Warn("new prop", "hash", fmt.Sprintf("%X", propBlockHash))
	// go to prevote, prevote for proposal block
	<-voteCh
	validatePrevote(t, cs1, 1, vss[0], propBlockHash)

	// now we see the others prevote for it, so we should lock on it
	signAddVoteToFromMany(types.VoteTypePrevote, cs1, propBlockHash, propBlockParts.Header(), cs2, cs3, cs4)

	<-voteCh // precommit

	// we should have precommitted
	validatePrecommit(t, cs1, 1, 1, vss[0], propBlockHash, propBlockHash)

	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs3)

	<-timeoutWaitCh

	incrementRound(cs2, cs3, cs4)

	<-newRoundCh

	log.Notice("### ONTO ROUND 2")
	/*Round3
	we see the polka from round 1 but we shouldn't unlock!
	*/

	// timeout of propose
	<-timeoutProposeCh

//.........这里部分代码省略.........

// 4 vals, one precommits, other 3 polka at next round, so we unlock and precomit the polka
func TestLockPOLUnlock(t *testing.T) {
	cs1, vss := randConsensusState(4)
	cs2, cs3, cs4 := vss[1], vss[2], vss[3]

	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)
	unlockCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringUnlock(), 1)
	voteCh := subscribeToVoter(cs1, cs1.privValidator.Address)

	// everything done from perspective of cs1

	/*
		Round1 (cs1, B) // B B B B // B nil B nil

		eg. didn't see the 2/3 prevotes
	*/

	// start round and wait for propose and prevote
	startTestRound(cs1, cs1.Height, 0)
	<-newRoundCh
	re := <-proposalCh
	rs := re.(types.EventDataRoundState).RoundState.(*RoundState)
	theBlockHash := rs.ProposalBlock.Hash()

	<-voteCh // prevote

	signAddVoteToFromMany(types.VoteTypePrevote, cs1, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header(), cs2, cs3, cs4)

	<-voteCh //precommit

	// the proposed block should now be locked and our precommit added
	validatePrecommit(t, cs1, 0, 0, vss[0], theBlockHash, theBlockHash)

	// add precommits from the rest
	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs4)
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs3, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header())

	// before we time out into new round, set next proposal block
	prop, propBlock := decideProposal(cs1, cs2, cs2.Height, cs2.Round+1)
	propBlockParts := propBlock.MakePartSet()

	incrementRound(cs2, cs3, cs4)

	// timeout to new round
	re = <-timeoutWaitCh
	rs = re.(types.EventDataRoundState).RoundState.(*RoundState)
	lockedBlockHash := rs.LockedBlock.Hash()

	//XXX: this isnt gauranteed to get there before the timeoutPropose ...
	cs1.SetProposalAndBlock(prop, propBlock, propBlockParts, "some peer")

	<-newRoundCh
	log.Notice("#### ONTO ROUND 1")
	/*
		Round2 (cs2, C) // B nil nil nil // nil nil nil _

		cs1 unlocks!
	*/

	// now we're on a new round and not the proposer,
	// but we should receive the proposal
	select {
	case <-proposalCh:
	case <-timeoutProposeCh:
		<-proposalCh
	}

	// go to prevote, prevote for locked block (not proposal)
	<-voteCh
	validatePrevote(t, cs1, 0, vss[0], lockedBlockHash)
	// now lets add prevotes from everyone else for nil (a polka!)
	signAddVoteToFromMany(types.VoteTypePrevote, cs1, nil, types.PartSetHeader{}, cs2, cs3, cs4)

	// the polka makes us unlock and precommit nil
	<-unlockCh
	<-voteCh // precommit

	// we should have unlocked and committed nil
	// NOTE: since we don't relock on nil, the lock round is 0
	validatePrecommit(t, cs1, 1, 0, vss[0], nil, nil)

	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs3)
	<-newRoundCh
}

// 4 vals, one precommits, other 3 polka at next round, so we unlock and precomit the polka
func TestLockPOLRelock(t *testing.T) {
	cs1, vss := randConsensusState(4)
	cs2, cs3, cs4 := vss[1], vss[2], vss[3]

	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	voteCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringVote(), 1)
	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)
	newBlockCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewBlock(), 1)

	log.Debug("cs2 last round", "lr", cs2.PrivValidator.LastRound)

	// everything done from perspective of cs1

	/*
		Round1 (cs1, B) // B B B B// B nil B nil

		eg. cs2 and cs4 didn't see the 2/3 prevotes
	*/

	// start round and wait for propose and prevote
	startTestRound(cs1, cs1.Height, 0)

	<-newRoundCh
	re := <-proposalCh
	rs := re.(types.EventDataRoundState).RoundState.(*RoundState)
	theBlockHash := rs.ProposalBlock.Hash()

	<-voteCh // prevote

	signAddVoteToFromMany(types.VoteTypePrevote, cs1, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header(), cs2, cs3, cs4)
	_, _, _ = <-voteCh, <-voteCh, <-voteCh // prevotes

	<-voteCh // our precommit
	// the proposed block should now be locked and our precommit added
	validatePrecommit(t, cs1, 0, 0, vss[0], theBlockHash, theBlockHash)

	// add precommits from the rest
	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs4)
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs3, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header())
	_, _, _ = <-voteCh, <-voteCh, <-voteCh // precommits

	// before we timeout to the new round set the new proposal
	prop, propBlock := decideProposal(cs1, cs2, cs2.Height, cs2.Round+1)
	propBlockParts := propBlock.MakePartSet()
	propBlockHash := propBlock.Hash()

	incrementRound(cs2, cs3, cs4)

	// timeout to new round
	<-timeoutWaitCh

	//XXX: this isnt gauranteed to get there before the timeoutPropose ...
	cs1.SetProposalAndBlock(prop, propBlock, propBlockParts, "some peer")

	<-newRoundCh
	log.Notice("### ONTO ROUND 1")

	/*
		Round2 (cs2, C) // B C C C // C C C _)

		cs1 changes lock!
	*/

	// now we're on a new round and not the proposer
	// but we should receive the proposal
	select {
	case <-proposalCh:
	case <-timeoutProposeCh:
		<-proposalCh
	}

	// go to prevote, prevote for locked block (not proposal), move on
	<-voteCh
	validatePrevote(t, cs1, 0, vss[0], theBlockHash)

	// now lets add prevotes from everyone else for the new block
	signAddVoteToFromMany(types.VoteTypePrevote, cs1, propBlockHash, propBlockParts.Header(), cs2, cs3, cs4)
	_, _, _ = <-voteCh, <-voteCh, <-voteCh // prevotes

	// now either we go to PrevoteWait or Precommit
	select {
	case <-timeoutWaitCh: // we're in PrevoteWait, go to Precommit
		<-voteCh
	case <-voteCh: // we went straight to Precommit
	}

	// we should have unlocked and locked on the new block
	validatePrecommit(t, cs1, 1, 1, vss[0], propBlockHash, propBlockHash)

	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, propBlockHash, propBlockParts.Header(), cs2, cs3)
	_, _ = <-voteCh, <-voteCh

	be := <-newBlockCh
	b := be.(types.EventDataNewBlock)
	re = <-newRoundCh
	rs = re.(types.EventDataRoundState).RoundState.(*RoundState)
	if rs.Height != 2 {
//.........这里部分代码省略.........

// two validators, 4 rounds.
// two vals take turns proposing. val1 locks on first one, precommits nil on everything else
func TestLockNoPOL(t *testing.T) {
	cs1, vss := randConsensusState(2)
	cs2 := vss[1]
	height := cs1.Height

	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
	voteCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringVote(), 1)
	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)

	/*
		Round1 (cs1, B) // B B // B B2
	*/

	// start round and wait for prevote
	cs1.enterNewRound(height, 0)
	cs1.startRoutines(0)

	re := <-proposalCh
	rs := re.(types.EventDataRoundState).RoundState.(*RoundState)
	theBlockHash := rs.ProposalBlock.Hash()

	<-voteCh // prevote

	// we should now be stuck in limbo forever, waiting for more prevotes
	// prevote arrives from cs2:
	signAddVoteToFrom(types.VoteTypePrevote, cs1, cs2, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header())
	<-voteCh // prevote

	<-voteCh // precommit

	// the proposed block should now be locked and our precommit added
	validatePrecommit(t, cs1, 0, 0, vss[0], theBlockHash, theBlockHash)

	// we should now be stuck in limbo forever, waiting for more precommits
	// lets add one for a different block
	// NOTE: in practice we should never get to a point where there are precommits for different blocks at the same round
	hash := make([]byte, len(theBlockHash))
	copy(hash, theBlockHash)
	hash[0] = byte((hash[0] + 1) % 255)
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs2, hash, rs.ProposalBlock.MakePartSet().Header())
	<-voteCh // precommit

	// (note we're entering precommit for a second time this round)
	// but with invalid args. then we enterPrecommitWait, and the timeout to new round
	<-timeoutWaitCh

	///

	<-newRoundCh
	log.Notice("#### ONTO ROUND 1")
	/*
		Round2 (cs1, B) // B B2
	*/

	incrementRound(cs2)

	// now we're on a new round and not the proposer, so wait for timeout
	re = <-timeoutProposeCh
	rs = re.(types.EventDataRoundState).RoundState.(*RoundState)

	if rs.ProposalBlock != nil {
		t.Fatal("Expected proposal block to be nil")
	}

	// wait to finish prevote
	<-voteCh

	// we should have prevoted our locked block
	validatePrevote(t, cs1, 1, vss[0], rs.LockedBlock.Hash())

	// add a conflicting prevote from the other validator
	signAddVoteToFrom(types.VoteTypePrevote, cs1, cs2, hash, rs.ProposalBlock.MakePartSet().Header())
	<-voteCh

	// now we're going to enter prevote again, but with invalid args
	// and then prevote wait, which should timeout. then wait for precommit
	<-timeoutWaitCh

	<-voteCh // precommit

	// the proposed block should still be locked and our precommit added
	// we should precommit nil and be locked on the proposal
	validatePrecommit(t, cs1, 1, 0, vss[0], nil, theBlockHash)

	// add conflicting precommit from cs2
	// NOTE: in practice we should never get to a point where there are precommits for different blocks at the same round
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs2, hash, rs.ProposalBlock.MakePartSet().Header())
	<-voteCh

	// (note we're entering precommit for a second time this round, but with invalid args
	// then we enterPrecommitWait and timeout into NewRound
	<-timeoutWaitCh

	<-newRoundCh
	log.Notice("#### ONTO ROUND 2")
	/*
//.........这里部分代码省略.........