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package oracle
import (
"math/big"
"testing"
"github.com/ethereum-optimism/optimism/go/gas-oracle/bindings"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
func TestBaseFeeUpdate(t *testing.T) {
key, _ := crypto.GenerateKey()
sim, _ := newSimulatedBackend(key)
chain := sim.Blockchain()
opts, _ := bind.NewKeyedTransactorWithChainID(key, big.NewInt(1337))
addr, _, gpo, err := bindings.DeployGasPriceOracle(opts, sim, opts.From)
if err != nil {
t.Fatal(err)
}
sim.Commit()
cfg := &Config{
privateKey: key,
l2ChainID: big.NewInt(1337),
gasPriceOracleAddress: addr,
gasPrice: big.NewInt(784637584),
}
update, err := wrapUpdateBaseFee(sim, sim, cfg)
if err != nil {
t.Fatal(err)
}
// Get the initial base fee
l1BaseFee, err := gpo.L1BaseFee(&bind.CallOpts{})
if err != nil {
t.Fatal(err)
}
// base fee should start at 0
if l1BaseFee.Cmp(common.Big0) != 0 {
t.Fatal("does not start at 0")
}
// get the header to know what the base fee
// should be updated to
tip := chain.CurrentHeader()
if tip.BaseFee == nil {
t.Fatal("no base fee found")
}
// Ensure that there is no false negative by
// checking that the values don't start out the same
if l1BaseFee.Cmp(tip.BaseFee) == 0 {
t.Fatal("values are already the same")
}
// Call the update function to do the update
if err := update(); err != nil {
t.Fatalf("cannot update base fee: %s", err)
}
sim.Commit()
// Check the updated base fee
l1BaseFee, err = gpo.L1BaseFee(&bind.CallOpts{})
if err != nil {
t.Fatal(err)
}
// the base fee should be equal to the value
// on the header
if tip.BaseFee.Cmp(l1BaseFee) != 0 {
t.Fatal("base fee not updated")
}
}