feat(forge): blobbasefee cheatcode

crates/cheatcodes/spec/src/vm.rs

@@ -402,6 +402,17 @@ interface Vm {
  #[cheatcode(group = Evm, safety = Safe)]
  function getBlockTimestamp() external view returns (uint256 timestamp);
 
+ /// Sets `block.blobbasefee`
+ #[cheatcode(group = Evm, safety = Unsafe)]
+ function blobBaseFee(uint256 newBlobBaseFee) external;
+
+ /// Gets the current `block.blobbasefee`.
+ /// You should use this instead of `block.blobbasefee` if you use `vm.blobBaseFee`, as `block.blobbasefee` is assumed to be constant across a transaction,
+ /// and as a result will get optimized out by the compiler.
+ /// See https://github.com/foundry-rs/foundry/issues/6180
+ #[cheatcode(group = Evm, safety = Safe)]
+ function getBlobBaseFee() external view returns (uint256 blobBaseFee);
+
  // -------- Account State --------
 
  /// Sets an address' balance.

crates/cheatcodes/src/evm.rs

@@ -328,6 +328,26 @@ impl Cheatcode for getBlockTimestampCall {
  }
 }
 
+impl Cheatcode for blobBaseFeeCall {
+ fn apply_full<DB: DatabaseExt>(&self, ccx: &mut CheatsCtxt<DB>) -> Result {
+ let Self { newBlobBaseFee } = self;
+ ensure!(
+ ccx.ecx.spec_id() >= SpecId::CANCUN,
+ "`blobBaseFee` is not supported before the Cancun hard fork; \
+ see EIP-4844: https://eips.ethereum.org/EIPS/eip-4844"
+ );
+ ccx.ecx.env.block.set_blob_excess_gas_and_price((*newBlobBaseFee).to());
+ Ok(Default::default())
+ }
+}
+
+impl Cheatcode for getBlobBaseFeeCall {
+ fn apply_full<DB: DatabaseExt>(&self, ccx: &mut CheatsCtxt<DB>) -> Result {
+ let Self {} = self;
+ Ok(ccx.ecx.env.block.get_blob_excess_gas().unwrap_or(0).abi_encode())
+ }
+}
+
 impl Cheatcode for dealCall {
  fn apply_full<DB: DatabaseExt>(&self, ccx: &mut CheatsCtxt<DB>) -> Result {
  let Self { account: address, newBalance: new_balance } = *self;

testdata/default/cheats/BlobBaseFee.t.sol

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+pragma solidity ^0.8.0;
+
+import "ds-test/test.sol";
+import "cheats/Vm.sol";
+
+contract BlobBaseFeeTest is DSTest {
+ Vm constant vm = Vm(HEVM_ADDRESS);
+
+ function test_blob_base_fee() public {
+ vm.blobBaseFee(6969);
+ assertEq(vm.getBlobBaseFee(), 6969);
+ }
+}