Forge test `expectEmit` fails when it should succeed

[zzh1996]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (df49ddd 2023-12-21T00:22:15.620581000Z)

What command(s) is the bug in?

forge test

Operating System

macOS (Intel)

Describe the bug

1. Run forge init

2. Modify these files accordingly:

Counter.sol

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

contract Counter {
    event TestEvent(uint n);

    constructor() {
        emit TestEvent(1);
    }

    function f() external {
        emit TestEvent(2);
    }
}

Counter.t.sol

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {Test, console2} from "forge-std/Test.sol";
import {Counter} from "../src/Counter.sol";

contract CounterTest is Test {
    Counter public counter;
    event TestEvent(uint n);

    function setUp() public {
        counter = new Counter();
    }

    function test_Bug() public {
        // part1
        vm.expectEmit();
        emit TestEvent(1);
        new Counter();

        // part2
        vm.expectEmit();
        emit TestEvent(2);
        counter.f();
    }
}

3. Run forge test -vvv

Expected behavior: test passed
Actual behavior: test failed

Traces:
  [77239] CounterTest::test_Bug()
    ├─ [0] VM::expectEmit()
    │   └─ ← ()
    ├─ emit TestEvent(n: 1)
    ├─ [33338] → new Counter@0x2e234DAe75C793f67A35089C9d99245E1C58470b
    │   ├─ emit TestEvent(n: 1)
    │   └─ ← 161 bytes of code
    ├─ [0] VM::expectEmit()
    │   └─ ← ()
    ├─ emit TestEvent(n: 2)
    ├─ [1179] Counter::f()
    │   ├─ emit TestEvent(n: 2)
    │   └─ ← ()
    └─ ← log != expected log

Note that when you comment out the three lines of code in part1, or the three lines of code in part2, the test can pass normally.

[zerosnacks]

Possibly related bug:

Same setup as OP, except replace function with

function test_Bug() public {
    vm.expectEmit();
    emit TestEvent(1);
    new Counter();
    
    vm.expectEmit();
    emit TestEvent(1);
    new Counter();
}

Throws:

[FAIL. Reason: expected an emit, but no logs were emitted afterwards. you might have mismatched events or not enough events were emitted] test_Bug() (gas: 136540)