feat(header/headertest): Enable block time intervals for header gener…

…ation (celestiaorg#3139)

Header test suite can now generate headers with the given block time
interval if it is specified.

Needed for testing pruner service.

header/headertest/testing.go

@@ -36,19 +36,24 @@ type TestSuite struct {
 	valPntr int
 
 	head *header.ExtendedHeader
+
+	// blockTime is optional - if set, the test suite will generate
+	// blocks timestamped at the specified interval
+	blockTime time.Duration
 }
 
 func NewStore(t *testing.T) libhead.Store[*header.ExtendedHeader] {
-	return headertest.NewStore[*header.ExtendedHeader](t, NewTestSuite(t, 3), 10)
+	return headertest.NewStore[*header.ExtendedHeader](t, NewTestSuite(t, 3, 0), 10)
 }
 
 // NewTestSuite setups a new test suite with a given number of validators.
-func NewTestSuite(t *testing.T, num int) *TestSuite {
-	valSet, vals := RandValidatorSet(num, 10)
+func NewTestSuite(t *testing.T, numValidators int, blockTime time.Duration) *TestSuite {
+	valSet, vals := RandValidatorSet(numValidators, 10)
 	return &TestSuite{
-		t:      t,
-		vals:   vals,
-		valSet: valSet,
+		t:         t,
+		vals:      vals,
+		valSet:    valSet,
+		blockTime: blockTime,
 	}
 }
 
@@ -155,13 +160,18 @@ func (s *TestSuite) GenRawHeader(
 	height uint64, lastHeader, lastCommit, dataHash libhead.Hash) *header.RawHeader {
 	rh := RandRawHeader(s.t)
 	rh.Height = int64(height)
-	rh.Time = time.Now()
 	rh.LastBlockID = types.BlockID{Hash: bytes.HexBytes(lastHeader)}
 	rh.LastCommitHash = bytes.HexBytes(lastCommit)
 	rh.DataHash = bytes.HexBytes(dataHash)
 	rh.ValidatorsHash = s.valSet.Hash()
 	rh.NextValidatorsHash = s.valSet.Hash()
 	rh.ProposerAddress = s.nextProposer().Address
+
+	rh.Time = time.Now()
+	if s.blockTime > 0 {
+		rh.Time = s.Head().Time().Add(s.blockTime)
+	}
+
 	return rh
 }
 

header/headertest/verify_test.go

@@ -12,7 +12,7 @@ import (
 )
 
 func TestVerify(t *testing.T) {
-	h := NewTestSuite(t, 2).GenExtendedHeaders(3)
+	h := NewTestSuite(t, 2, 0).GenExtendedHeaders(3)
 	trusted, untrustedAdj, untrustedNonAdj := h[0], h[1], h[2]
 	tests := []struct {
 		prepare func() *header.ExtendedHeader
@@ -47,7 +47,7 @@ func TestVerify(t *testing.T) {
 		{
 			prepare: func() *header.ExtendedHeader {
 				untrusted := *untrustedNonAdj
-				untrusted.Commit = NewTestSuite(t, 2).Commit(RandRawHeader(t))
+				untrusted.Commit = NewTestSuite(t, 2, 0).Commit(RandRawHeader(t))
 				return &untrusted
 			},
 			err: header.ErrVerifyCommitLightTrustingFailed,