regression(cheatcodes): vm.chainId failed to set blockId on nightly with --isolate #10586
Description
Component
Forge
Have you ensured that all of these are up to date?
- Foundry
- Foundryup
What version of Foundry are you on?
forge Version: 1.2.0-nightly Commit SHA: a93c000 Build Timestamp: 2025-05-21T06:02:36.119934000Z (1747807356) Build Profile: maxperf
What version of Foundryup are you on?
foundryup: 1.0.1
What command(s) is the bug in?
forge test
Operating System
macOS (Apple Silicon)
Describe the bug
When a function in a smart contract uses block.chainid in its computation, it expects a different result when the chainId is different. However, after using vm.chainId in the unit test, the function call fails with [Revert] EvmError: Revert
A minimum reproducible example is below:
pragma solidity ^0.8;
abstract contract ChainIdExampleEvents {
event ChainId(uint256 indexed chainId);
}
contract ChainIdExample is ChainIdExampleEvents{
function chainIdTest() public {
emit ChainId(block.chainid);
}
}and test file
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.6.0 <0.9.0;
import { Test } from "forge-std/Test.sol";
import { ChainIdExample, ChainIdExampleEvents } from "../src/ChainIdExample.sol";
contract ChainIdExampleTest is Test, ChainIdExampleEvents {
ChainIdExample public chainIdExample;
function setUp() public {
chainIdExample = new ChainIdExample();
}
function test_GetChainId() public {
uint256 chainId = block.chainid;
vm.expectEmit(true, true, false, false, address(chainIdExample));
emit ChainId(chainId);
chainIdExample.chainIdTest();
}
function test_GetChainIdAfterSet() public {
uint256 chainId = block.chainid;
vm.assertGt(address(chainIdExample).code.length, 0);
chainIdExample.chainIdTest();
vm.chainId(100);
vm.assertGt(address(chainIdExample).code.length, 0);
chainIdExample.chainIdTest();
}
}Run with command forge test -vvvv --gas-report --match-test test_GetChainId --force
The unit test test_GetChainIdAfterSet fails with:
[FAIL: EvmError: Revert] test_GetChainIdAfterSet() (gas: 32160)
Traces:
[123709] ChainIdExampleTest::setUp()
├─ [86261] → new ChainIdExample@0x5615dEB798BB3E4dFa0139dFa1b3D433Cc23b72f
│ └─ ← [Return] 152 bytes of code
└─ ← [Stop]
[32160] ChainIdExampleTest::test_GetChainIdAfterSet()
├─ [0] VM::assertGt(152, 0) [staticcall]
│ └─ ← [Return]
├─ [22334] ChainIdExample::chainIdTest()
│ ├─ emit ChainId(chainId: 31337 [3.133e4])
│ └─ ← [Stop]
├─ [0] VM::chainId(100)
│ └─ ← [Return]
├─ [0] VM::assertGt(152, 0) [staticcall]
│ └─ ← [Return]
├─ [0] ChainIdExample::chainIdTest()
│ └─ ← [Revert] EvmError: Revert
└─ ← [Revert] EvmError: Revert
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