chore: make unused block hashes in testing header creation explicit (c…

…osmos#5857)

* Make unused block hashes in testing header creation explicit

* lint

* nit: make unusedHash a private var

---------

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>
Co-authored-by: DimitrisJim <d.f.hilliard@gmail.com>

testing/chain.go

@@ -472,7 +472,7 @@ func (chain *TestChain) CurrentTMClientHeader() *ibctm.Header {
 // be used to sign over the proposed header.
 func CommitHeader(proposedHeader cmttypes.Header, valSet *cmttypes.ValidatorSet, signers map[string]cmttypes.PrivValidator) (*cmtproto.SignedHeader, error) {
 	hhash := proposedHeader.Hash()
-	blockID := MakeBlockID(hhash, 3, tmhash.Sum([]byte("part_set")))
+	blockID := MakeBlockID(hhash, 3, unusedHash)
 	voteSet := cmttypes.NewVoteSet(proposedHeader.ChainID, proposedHeader.Height, 1, cmtproto.PrecommitType, valSet)
 
 	// MakeExtCommit expects a signer array in the same order as the validator array.
@@ -512,13 +512,13 @@ func (chain *TestChain) CreateTMClientHeader(chainID string, blockHeight int64,
 		Time:               timestamp,
 		LastBlockID:        MakeBlockID(make([]byte, tmhash.Size), 10_000, make([]byte, tmhash.Size)),
 		LastCommitHash:     chain.App.LastCommitID().Hash,
-		DataHash:           tmhash.Sum([]byte("data_hash")),
+		DataHash:           unusedHash,
 		ValidatorsHash:     cmtValSet.Hash(),
 		NextValidatorsHash: nextVals.Hash(),
-		ConsensusHash:      tmhash.Sum([]byte("consensus_hash")),
+		ConsensusHash:      unusedHash,
 		AppHash:            chain.ProposedHeader.AppHash,
-		LastResultsHash:    tmhash.Sum([]byte("last_results_hash")),
-		EvidenceHash:       tmhash.Sum([]byte("evidence_hash")),
+		LastResultsHash:    unusedHash,
+		EvidenceHash:       unusedHash,
 		ProposerAddress:    cmtValSet.Proposer.Address, //nolint:staticcheck
 	}
 

testing/values.go

@@ -11,6 +11,8 @@ import (
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
+	"github.com/cometbft/cometbft/crypto/tmhash"
+
 	ibctransfertypes "github.com/cosmos/ibc-go/v8/modules/apps/transfer/types"
 	connectiontypes "github.com/cosmos/ibc-go/v8/modules/core/03-connection/types"
 	commitmenttypes "github.com/cosmos/ibc-go/v8/modules/core/23-commitment/types"
@@ -67,4 +69,6 @@ var (
 	MockRecvCanaryCapabilityName = mock.MockRecvCanaryCapabilityName
 
 	prefix = commitmenttypes.NewMerklePrefix([]byte("ibc"))
+	// unusedHash is a placeholder hash used for testing.
+	unusedHash = tmhash.Sum([]byte{0x00})
 )