internal/ethapi: add testcases for blobTx (#27818)

Co-authored-by: Martin Holst Swende <martin@swende.se>

core/chain_makers.go

@@ -24,6 +24,7 @@ import (
 	"github.com/ethereum/go-ethereum/consensus"
 	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/consensus/misc/eip1559"
+	"github.com/ethereum/go-ethereum/consensus/misc/eip4844"
 	"github.com/ethereum/go-ethereum/core/rawdb"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -87,6 +88,11 @@ func (b *BlockGen) SetPoS() {
 	b.header.Difficulty = new(big.Int)
 }
 
+// SetBlobGas sets the data gas used by the blob in the generated block.
+func (b *BlockGen) SetBlobGas(blobGasUsed uint64) {
+	b.header.BlobGasUsed = &blobGasUsed
+}
+
 // addTx adds a transaction to the generated block. If no coinbase has
 // been set, the block's coinbase is set to the zero address.
 //
@@ -393,6 +399,19 @@ func makeHeader(chain consensus.ChainReader, parent *types.Block, state *state.S
 			header.GasLimit = CalcGasLimit(parentGasLimit, parentGasLimit)
 		}
 	}
+	if chain.Config().IsCancun(header.Number, header.Time) {
+		var (
+			parentExcessBlobGas uint64
+			parentBlobGasUsed   uint64
+		)
+		if parent.ExcessBlobGas() != nil {
+			parentExcessBlobGas = *parent.ExcessBlobGas()
+			parentBlobGasUsed = *parent.BlobGasUsed()
+		}
+		excessBlobGas := eip4844.CalcExcessBlobGas(parentExcessBlobGas, parentBlobGasUsed)
+		header.ExcessBlobGas = &excessBlobGas
+		header.BlobGasUsed = new(uint64)
+	}
 	return header
 }