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fix: emit console.log on fuzz test last run at verbosity >= 2 #12478

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a08106f
Update mod.rs
avorylli Nov 6, 2025
e5b7bfa
Update mod.rs
avorylli Nov 6, 2025
020b4d9
Merge branch 'master' into fix/fuzz-console-log-last-run
avorylli Nov 12, 2025
262a16f
Update mod.rs
avorylli Nov 13, 2025
314b504
Merge branch 'master' into fix/fuzz-console-log-last-run
avorylli Nov 13, 2025
5607b62
Update mod.rs
avorylli Nov 13, 2025
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16 changes: 14 additions & 2 deletions crates/evm/evm/src/executors/fuzz/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,8 @@ struct FuzzTestData {
breakpoints: Option<Breakpoints>,
// Stores coverage information for all fuzz cases.
coverage: Option<HitMaps>,
// Stores logs for all fuzz cases
// Stores logs for all fuzz cases (when show_logs is true) or just the last run (when show_logs
// is false)
logs: Vec<Log>,
// Deprecated cheatcodes mapped to their replacements.
deprecated_cheatcodes: HashMap<&'static str, Option<&'static str>>,
Expand Down Expand Up @@ -198,8 +199,13 @@ impl FuzzedExecutor {
test_data.breakpoints.replace(case.breakpoints);
}

// Always store logs from the last run in test_data.logs for display at
// verbosity >= 2. When show_logs is true,
// accumulate all logs. When false, only keep the last run's logs.
if self.config.show_logs {
test_data.logs.extend(case.logs);
} else {
test_data.logs = case.logs;
}

HitMaps::merge_opt(&mut test_data.coverage, case.coverage);
Expand Down Expand Up @@ -255,14 +261,20 @@ impl FuzzedExecutor {
(call.traces.clone(), call.cheatcodes.map(|c| c.breakpoints))
};

// test_data.logs already contains the appropriate logs:
// - For failed tests: logs from the counterexample
// - For successful tests with show_logs=true: all logs from all runs
// - For successful tests with show_logs=false: logs from the last run only
let result_logs = test_data.logs;

let mut result = FuzzTestResult {
first_case: test_data.first_case.unwrap_or_default(),
gas_by_case: test_data.gas_by_case,
success: test_data.failure.is_none(),
skipped: false,
reason: None,
counterexample: None,
logs: test_data.logs,
logs: result_logs,
labels: call.labels,
traces: last_run_traces,
breakpoints: last_run_breakpoints,
Expand Down
16 changes: 12 additions & 4 deletions crates/forge/tests/cli/test_cmd/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1126,8 +1126,8 @@ Ran 1 test suite [ELAPSED]: 1 tests passed, 0 failed, 0 skipped (1 total tests)
"#]]);
});

// tests that `forge test` with config `show_logs: false` for fuzz tests will not display
// `console.log` info
// tests that `forge test` with config `show_logs: false` for fuzz tests will
// still display `console.log` from the last run at verbosity >= 2 (issue #11039)
forgetest_init!(should_not_show_logs_when_fuzz_test, |prj, cmd| {
// run fuzz test 3 times
prj.update_config(|config| {
Expand All @@ -1149,22 +1149,26 @@ forgetest_init!(should_not_show_logs_when_fuzz_test, |prj, cmd| {
}
"#,
);
// At verbosity >= 2, logs from the last run should be shown even when show_logs is false
cmd.args(["test", "-vv"]).assert_success().stdout_eq(str![[r#"
[COMPILING_FILES] with [SOLC_VERSION]
[SOLC_VERSION] [ELAPSED]
Compiler run successful!

Ran 1 test for test/ContractFuzz.t.sol:ContractFuzz
[PASS] testFuzzConsoleLog(uint256) (runs: 3, [AVG_GAS])
Logs:
inside fuzz test, x is: [..]

Suite result: ok. 1 passed; 0 failed; 0 skipped; [ELAPSED]

Ran 1 test suite [ELAPSED]: 1 tests passed, 0 failed, 0 skipped (1 total tests)

"#]]);
});

// tests that `forge test` with inline config `show_logs = false` for fuzz tests will not
// display `console.log` info
// tests that `forge test` with inline config `show_logs = false` for fuzz tests will
// still display `console.log` from the last run at verbosity >= 2 (issue #11039)
forgetest_init!(should_not_show_logs_when_fuzz_test_inline_config, |prj, cmd| {
// run fuzz test 3 times
prj.update_config(|config| {
Expand All @@ -1186,13 +1190,17 @@ contract ContractFuzz is Test {
}
"#,
);
// At verbosity >= 2, logs from the last run should be shown even when show_logs is false
cmd.args(["test", "-vv"]).assert_success().stdout_eq(str![[r#"
[COMPILING_FILES] with [SOLC_VERSION]
[SOLC_VERSION] [ELAPSED]
Compiler run successful!

Ran 1 test for test/ContractFuzz.t.sol:ContractFuzz
[PASS] testFuzzConsoleLog(uint256) (runs: 3, [AVG_GAS])
Logs:
inside fuzz test, x is: [..]

Suite result: ok. 1 passed; 0 failed; 0 skipped; [ELAPSED]

Ran 1 test suite [ELAPSED]: 1 tests passed, 0 failed, 0 skipped (1 total tests)
Expand Down
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