library/test/src/lib.rs

   1 //! Support code for rustc's built in unit-test and micro-benchmarking
   2 //! framework.
   3 //!
   4 //! Almost all user code will only be interested in `Bencher` and
   5 //! `black_box`. All other interactions (such as writing tests and
   6 //! benchmarks themselves) should be done via the `#[test]` and
   7 //! `#[bench]` attributes.
   8 //!
   9 //! See the [Testing Chapter](../book/ch11-00-testing.html) of the book for more details.
  10
  11 // Currently, not much of this is meant for users. It is intended to
  12 // support the simplest interface possible for representing and
  13 // running tests while providing a base that other test frameworks may
  14 // build off of.
  15
  16 #![unstable(feature = "test", issue = "50297")]
  17 #![doc(test(attr(deny(warnings))))]
  18 #![feature(nll)]
  19 #![feature(bench_black_box)]
  20 #![feature(internal_output_capture)]
  21 #![feature(staged_api)]
  22 #![feature(termination_trait_lib)]
  23 #![feature(test)]
  24 #![feature(total_cmp)]
  25
  26 // Public reexports
  27 pub use self::bench::{black_box, Bencher};
  28 pub use self::console::run_tests_console;
  29 pub use self::options::{ColorConfig, Options, OutputFormat, RunIgnored, ShouldPanic};
  30 pub use self::types::TestName::*;
  31 pub use self::types::*;
  32 pub use self::ColorConfig::*;
  33 pub use cli::TestOpts;
  34
  35 // Module to be used by rustc to compile tests in libtest
  36 pub mod test {
  37     pub use crate::{
  38         assert_test_result,
  39         bench::Bencher,
  40         cli::{parse_opts, TestOpts},
  41         filter_tests,
  42         helpers::metrics::{Metric, MetricMap},
  43         options::{Concurrent, Options, RunIgnored, RunStrategy, ShouldPanic},
  44         run_test, test_main, test_main_static,
  45         test_result::{TestResult, TrFailed, TrFailedMsg, TrIgnored, TrOk},
  46         time::{TestExecTime, TestTimeOptions},
  47         types::{
  48             DynTestFn, DynTestName, StaticBenchFn, StaticTestFn, StaticTestName, TestDesc,
  49             TestDescAndFn, TestId, TestName, TestType,
  50         },
  51     };
  52 }
  53
  54 use std::{
  55     collections::VecDeque,
  56     env, io,
  57     io::prelude::Write,
  58     panic::{self, catch_unwind, AssertUnwindSafe, PanicInfo},
  59     process::{self, Command, Termination},
  60     sync::mpsc::{channel, Sender},
  61     sync::{Arc, Mutex},
  62     thread,
  63     time::{Duration, Instant},
  64 };
  65
  66 pub mod bench;
  67 mod cli;
  68 mod console;
  69 mod event;
  70 mod formatters;
  71 mod helpers;
  72 mod options;
  73 pub mod stats;
  74 mod term;
  75 mod test_result;
  76 mod time;
  77 mod types;
  78
  79 #[cfg(test)]
  80 mod tests;
  81
  82 use event::{CompletedTest, TestEvent};
  83 use helpers::concurrency::get_concurrency;
  84 use helpers::exit_code::get_exit_code;
  85 use helpers::shuffle::{get_shuffle_seed, shuffle_tests};
  86 use options::{Concurrent, RunStrategy};
  87 use test_result::*;
  88 use time::TestExecTime;
  89
  90 // Process exit code to be used to indicate test failures.
  91 const ERROR_EXIT_CODE: i32 = 101;
  92
  93 const SECONDARY_TEST_INVOKER_VAR: &str = "__RUST_TEST_INVOKE";
  94
  95 // The default console test runner. It accepts the command line
  96 // arguments and a vector of test_descs.
  97 pub fn test_main(args: &[String], tests: Vec<TestDescAndFn>, options: Option<Options>) {
  98     let mut opts = match cli::parse_opts(args) {
  99         Some(Ok(o)) => o,
 100         Some(Err(msg)) => {
 101             eprintln!("error: {}", msg);
 102             process::exit(ERROR_EXIT_CODE);
 103         }
 104         None => return,
 105     };
 106     if let Some(options) = options {
 107         opts.options = options;
 108     }
 109     if opts.list {
 110         if let Err(e) = console::list_tests_console(&opts, tests) {
 111             eprintln!("error: io error when listing tests: {:?}", e);
 112             process::exit(ERROR_EXIT_CODE);
 113         }
 114     } else {
 115         match console::run_tests_console(&opts, tests) {
 116             Ok(true) => {}
 117             Ok(false) => process::exit(ERROR_EXIT_CODE),
 118             Err(e) => {
 119                 eprintln!("error: io error when listing tests: {:?}", e);
 120                 process::exit(ERROR_EXIT_CODE);
 121             }
 122         }
 123     }
 124 }
 125
 126 /// A variant optimized for invocation with a static test vector.
 127 /// This will panic (intentionally) when fed any dynamic tests.
 128 ///
 129 /// This is the entry point for the main function generated by `rustc --test`
 130 /// when panic=unwind.
 131 pub fn test_main_static(tests: &[&TestDescAndFn]) {
 132     let args = env::args().collect::<Vec<_>>();
 133     let owned_tests: Vec<_> = tests.iter().map(make_owned_test).collect();
 134     test_main(&args, owned_tests, None)
 135 }
 136
 137 /// A variant optimized for invocation with a static test vector.
 138 /// This will panic (intentionally) when fed any dynamic tests.
 139 ///
 140 /// Runs tests in panic=abort mode, which involves spawning subprocesses for
 141 /// tests.
 142 ///
 143 /// This is the entry point for the main function generated by `rustc --test`
 144 /// when panic=abort.
 145 pub fn test_main_static_abort(tests: &[&TestDescAndFn]) {
 146     // If we're being run in SpawnedSecondary mode, run the test here. run_test
 147     // will then exit the process.
 148     if let Ok(name) = env::var(SECONDARY_TEST_INVOKER_VAR) {
 149         env::remove_var(SECONDARY_TEST_INVOKER_VAR);
 150         let test = tests
 151             .iter()
 152             .filter(|test| test.desc.name.as_slice() == name)
 153             .map(make_owned_test)
 154             .next()
 155             .unwrap_or_else(|| panic!("couldn't find a test with the provided name '{}'", name));
 156         let TestDescAndFn { desc, testfn } = test;
 157         let testfn = match testfn {
 158             StaticTestFn(f) => f,
 159             _ => panic!("only static tests are supported"),
 160         };
 161         run_test_in_spawned_subprocess(desc, Box::new(testfn));
 162     }
 163
 164     let args = env::args().collect::<Vec<_>>();
 165     let owned_tests: Vec<_> = tests.iter().map(make_owned_test).collect();
 166     test_main(&args, owned_tests, Some(Options::new().panic_abort(true)))
 167 }
 168
 169 /// Clones static values for putting into a dynamic vector, which test_main()
 170 /// needs to hand out ownership of tests to parallel test runners.
 171 ///
 172 /// This will panic when fed any dynamic tests, because they cannot be cloned.
 173 fn make_owned_test(test: &&TestDescAndFn) -> TestDescAndFn {
 174     match test.testfn {
 175         StaticTestFn(f) => TestDescAndFn { testfn: StaticTestFn(f), desc: test.desc.clone() },
 176         StaticBenchFn(f) => TestDescAndFn { testfn: StaticBenchFn(f), desc: test.desc.clone() },
 177         _ => panic!("non-static tests passed to test::test_main_static"),
 178     }
 179 }
 180
 181 /// Invoked when unit tests terminate. Should panic if the unit
 182 /// Tests is considered a failure. By default, invokes `report()`
 183 /// and checks for a `0` result.
 184 pub fn assert_test_result<T: Termination>(result: T) {
 185     let code = result.report();
 186     assert_eq!(
 187         code, 0,
 188         "the test returned a termination value with a non-zero status code ({}) \
 189          which indicates a failure",
 190         code
 191     );
 192 }
 193
 194 pub fn run_tests<F>(
 195     opts: &TestOpts,
 196     tests: Vec<TestDescAndFn>,
 197     mut notify_about_test_event: F,
 198 ) -> io::Result<()>
 199 where
 200     F: FnMut(TestEvent) -> io::Result<()>,
 201 {
 202     use std::collections::{self, HashMap};
 203     use std::hash::BuildHasherDefault;
 204     use std::sync::mpsc::RecvTimeoutError;
 205
 206     struct RunningTest {
 207         join_handle: Option<thread::JoinHandle<()>>,
 208     }
 209
 210     // Use a deterministic hasher
 211     type TestMap =
 212         HashMap<TestId, RunningTest, BuildHasherDefault<collections::hash_map::DefaultHasher>>;
 213
 214     struct TimeoutEntry {
 215         id: TestId,
 216         desc: TestDesc,
 217         timeout: Instant,
 218     }
 219
 220     let tests_len = tests.len();
 221
 222     let mut filtered_tests = filter_tests(opts, tests);
 223     if !opts.bench_benchmarks {
 224         filtered_tests = convert_benchmarks_to_tests(filtered_tests);
 225     }
 226
 227     let filtered_tests = {
 228         let mut filtered_tests = filtered_tests;
 229         for test in filtered_tests.iter_mut() {
 230             test.desc.name = test.desc.name.with_padding(test.testfn.padding());
 231         }
 232
 233         filtered_tests
 234     };
 235
 236     let filtered_out = tests_len - filtered_tests.len();
 237     let event = TestEvent::TeFilteredOut(filtered_out);
 238     notify_about_test_event(event)?;
 239
 240     let filtered_descs = filtered_tests.iter().map(|t| t.desc.clone()).collect();
 241
 242     let shuffle_seed = get_shuffle_seed(opts);
 243
 244     let event = TestEvent::TeFiltered(filtered_descs, shuffle_seed);
 245     notify_about_test_event(event)?;
 246
 247     let (filtered_tests, filtered_benchs): (Vec<_>, _) = filtered_tests
 248         .into_iter()
 249         .enumerate()
 250         .map(|(i, e)| (TestId(i), e))
 251         .partition(|(_, e)| matches!(e.testfn, StaticTestFn(_) | DynTestFn(_)));
 252
 253     let concurrency = opts.test_threads.unwrap_or_else(get_concurrency);
 254
 255     let mut remaining = filtered_tests;
 256     if let Some(shuffle_seed) = shuffle_seed {
 257         shuffle_tests(shuffle_seed, &mut remaining);
 258     } else {
 259         remaining.reverse();
 260     }
 261     let mut pending = 0;
 262
 263     let (tx, rx) = channel::<CompletedTest>();
 264     let run_strategy = if opts.options.panic_abort && !opts.force_run_in_process {
 265         RunStrategy::SpawnPrimary
 266     } else {
 267         RunStrategy::InProcess
 268     };
 269
 270     let mut running_tests: TestMap = HashMap::default();
 271     let mut timeout_queue: VecDeque<TimeoutEntry> = VecDeque::new();
 272
 273     fn get_timed_out_tests(
 274         running_tests: &TestMap,
 275         timeout_queue: &mut VecDeque<TimeoutEntry>,
 276     ) -> Vec<TestDesc> {
 277         let now = Instant::now();
 278         let mut timed_out = Vec::new();
 279         while let Some(timeout_entry) = timeout_queue.front() {
 280             if now < timeout_entry.timeout {
 281                 break;
 282             }
 283             let timeout_entry = timeout_queue.pop_front().unwrap();
 284             if running_tests.contains_key(&timeout_entry.id) {
 285                 timed_out.push(timeout_entry.desc);
 286             }
 287         }
 288         timed_out
 289     }
 290
 291     fn calc_timeout(timeout_queue: &VecDeque<TimeoutEntry>) -> Option<Duration> {
 292         timeout_queue.front().map(|&TimeoutEntry { timeout: next_timeout, .. }| {
 293             let now = Instant::now();
 294             if next_timeout >= now { next_timeout - now } else { Duration::new(0, 0) }
 295         })
 296     }
 297
 298     if concurrency == 1 {
 299         while !remaining.is_empty() {
 300             let (id, test) = remaining.pop().unwrap();
 301             let event = TestEvent::TeWait(test.desc.clone());
 302             notify_about_test_event(event)?;
 303             let join_handle =
 304                 run_test(opts, !opts.run_tests, id, test, run_strategy, tx.clone(), Concurrent::No);
 305             assert!(join_handle.is_none());
 306             let completed_test = rx.recv().unwrap();
 307
 308             let event = TestEvent::TeResult(completed_test);
 309             notify_about_test_event(event)?;
 310         }
 311     } else {
 312         while pending > 0 || !remaining.is_empty() {
 313             while pending < concurrency && !remaining.is_empty() {
 314                 let (id, test) = remaining.pop().unwrap();
 315                 let timeout = time::get_default_test_timeout();
 316                 let desc = test.desc.clone();
 317
 318                 let event = TestEvent::TeWait(desc.clone());
 319                 notify_about_test_event(event)?; //here no pad
 320                 let join_handle = run_test(
 321                     opts,
 322                     !opts.run_tests,
 323                     id,
 324                     test,
 325                     run_strategy,
 326                     tx.clone(),
 327                     Concurrent::Yes,
 328                 );
 329                 running_tests.insert(id, RunningTest { join_handle });
 330                 timeout_queue.push_back(TimeoutEntry { id, desc, timeout });
 331                 pending += 1;
 332             }
 333
 334             let mut res;
 335             loop {
 336                 if let Some(timeout) = calc_timeout(&timeout_queue) {
 337                     res = rx.recv_timeout(timeout);
 338                     for test in get_timed_out_tests(&running_tests, &mut timeout_queue) {
 339                         let event = TestEvent::TeTimeout(test);
 340                         notify_about_test_event(event)?;
 341                     }
 342
 343                     match res {
 344                         Err(RecvTimeoutError::Timeout) => {
 345                             // Result is not yet ready, continue waiting.
 346                         }
 347                         _ => {
 348                             // We've got a result, stop the loop.
 349                             break;
 350                         }
 351                     }
 352                 } else {
 353                     res = rx.recv().map_err(|_| RecvTimeoutError::Disconnected);
 354                     break;
 355                 }
 356             }
 357
 358             let mut completed_test = res.unwrap();
 359             let running_test = running_tests.remove(&completed_test.id).unwrap();
 360             if let Some(join_handle) = running_test.join_handle {
 361                 if let Err(_) = join_handle.join() {
 362                     if let TrOk = completed_test.result {
 363                         completed_test.result =
 364                             TrFailedMsg("panicked after reporting success".to_string());
 365                     }
 366                 }
 367             }
 368
 369             let event = TestEvent::TeResult(completed_test);
 370             notify_about_test_event(event)?;
 371             pending -= 1;
 372         }
 373     }
 374
 375     if opts.bench_benchmarks {
 376         // All benchmarks run at the end, in serial.
 377         for (id, b) in filtered_benchs {
 378             let event = TestEvent::TeWait(b.desc.clone());
 379             notify_about_test_event(event)?;
 380             run_test(opts, false, id, b, run_strategy, tx.clone(), Concurrent::No);
 381             let completed_test = rx.recv().unwrap();
 382
 383             let event = TestEvent::TeResult(completed_test);
 384             notify_about_test_event(event)?;
 385         }
 386     }
 387     Ok(())
 388 }
 389
 390 pub fn filter_tests(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> Vec<TestDescAndFn> {
 391     let mut filtered = tests;
 392     let matches_filter = |test: &TestDescAndFn, filter: &str| {
 393         let test_name = test.desc.name.as_slice();
 394
 395         match opts.filter_exact {
 396             true => test_name == filter,
 397             false => test_name.contains(filter),
 398         }
 399     };
 400
 401     // Remove tests that don't match the test filter
 402     if !opts.filters.is_empty() {
 403         filtered.retain(|test| opts.filters.iter().any(|filter| matches_filter(test, filter)));
 404     }
 405
 406     // Skip tests that match any of the skip filters
 407     filtered.retain(|test| !opts.skip.iter().any(|sf| matches_filter(test, sf)));
 408
 409     // Excludes #[should_panic] tests
 410     if opts.exclude_should_panic {
 411         filtered.retain(|test| test.desc.should_panic == ShouldPanic::No);
 412     }
 413
 414     // maybe unignore tests
 415     match opts.run_ignored {
 416         RunIgnored::Yes => {
 417             filtered.iter_mut().for_each(|test| test.desc.ignore = false);
 418         }
 419         RunIgnored::Only => {
 420             filtered.retain(|test| test.desc.ignore);
 421             filtered.iter_mut().for_each(|test| test.desc.ignore = false);
 422         }
 423         RunIgnored::No => {}
 424     }
 425
 426     // Sort the tests alphabetically
 427     filtered.sort_by(|t1, t2| t1.desc.name.as_slice().cmp(t2.desc.name.as_slice()));
 428
 429     filtered
 430 }
 431
 432 pub fn convert_benchmarks_to_tests(tests: Vec<TestDescAndFn>) -> Vec<TestDescAndFn> {
 433     // convert benchmarks to tests, if we're not benchmarking them
 434     tests
 435         .into_iter()
 436         .map(|x| {
 437             let testfn = match x.testfn {
 438                 DynBenchFn(benchfn) => DynTestFn(Box::new(move || {
 439                     bench::run_once(|b| __rust_begin_short_backtrace(|| benchfn(b)))
 440                 })),
 441                 StaticBenchFn(benchfn) => DynTestFn(Box::new(move || {
 442                     bench::run_once(|b| __rust_begin_short_backtrace(|| benchfn(b)))
 443                 })),
 444                 f => f,
 445             };
 446             TestDescAndFn { desc: x.desc, testfn }
 447         })
 448         .collect()
 449 }
 450
 451 pub fn run_test(
 452     opts: &TestOpts,
 453     force_ignore: bool,
 454     id: TestId,
 455     test: TestDescAndFn,
 456     strategy: RunStrategy,
 457     monitor_ch: Sender<CompletedTest>,
 458     concurrency: Concurrent,
 459 ) -> Option<thread::JoinHandle<()>> {
 460     let TestDescAndFn { desc, testfn } = test;
 461
 462     // Emscripten can catch panics but other wasm targets cannot
 463     let ignore_because_no_process_support = desc.should_panic != ShouldPanic::No
 464         && cfg!(target_family = "wasm")
 465         && !cfg!(target_os = "emscripten");
 466
 467     if force_ignore || desc.ignore || ignore_because_no_process_support {
 468         let message = CompletedTest::new(id, desc, TrIgnored, None, Vec::new());
 469         monitor_ch.send(message).unwrap();
 470         return None;
 471     }
 472
 473     struct TestRunOpts {
 474         pub strategy: RunStrategy,
 475         pub nocapture: bool,
 476         pub concurrency: Concurrent,
 477         pub time: Option<time::TestTimeOptions>,
 478     }
 479
 480     fn run_test_inner(
 481         id: TestId,
 482         desc: TestDesc,
 483         monitor_ch: Sender<CompletedTest>,
 484         testfn: Box<dyn FnOnce() + Send>,
 485         opts: TestRunOpts,
 486     ) -> Option<thread::JoinHandle<()>> {
 487         let concurrency = opts.concurrency;
 488         let name = desc.name.clone();
 489
 490         let runtest = move || match opts.strategy {
 491             RunStrategy::InProcess => run_test_in_process(
 492                 id,
 493                 desc,
 494                 opts.nocapture,
 495                 opts.time.is_some(),
 496                 testfn,
 497                 monitor_ch,
 498                 opts.time,
 499             ),
 500             RunStrategy::SpawnPrimary => spawn_test_subprocess(
 501                 id,
 502                 desc,
 503                 opts.nocapture,
 504                 opts.time.is_some(),
 505                 monitor_ch,
 506                 opts.time,
 507             ),
 508         };
 509
 510         // If the platform is single-threaded we're just going to run
 511         // the test synchronously, regardless of the concurrency
 512         // level.
 513         let supports_threads = !cfg!(target_os = "emscripten") && !cfg!(target_family = "wasm");
 514         if concurrency == Concurrent::Yes && supports_threads {
 515             let cfg = thread::Builder::new().name(name.as_slice().to_owned());
 516             let mut runtest = Arc::new(Mutex::new(Some(runtest)));
 517             let runtest2 = runtest.clone();
 518             match cfg.spawn(move || runtest2.lock().unwrap().take().unwrap()()) {
 519                 Ok(handle) => Some(handle),
 520                 Err(e) if e.kind() == io::ErrorKind::WouldBlock => {
 521                     // `ErrorKind::WouldBlock` means hitting the thread limit on some
 522                     // platforms, so run the test synchronously here instead.
 523                     Arc::get_mut(&mut runtest).unwrap().get_mut().unwrap().take().unwrap()();
 524                     None
 525                 }
 526                 Err(e) => panic!("failed to spawn thread to run test: {}", e),
 527             }
 528         } else {
 529             runtest();
 530             None
 531         }
 532     }
 533
 534     let test_run_opts =
 535         TestRunOpts { strategy, nocapture: opts.nocapture, concurrency, time: opts.time_options };
 536
 537     match testfn {
 538         DynBenchFn(benchfn) => {
 539             // Benchmarks aren't expected to panic, so we run them all in-process.
 540             crate::bench::benchmark(id, desc, monitor_ch, opts.nocapture, benchfn);
 541             None
 542         }
 543         StaticBenchFn(benchfn) => {
 544             // Benchmarks aren't expected to panic, so we run them all in-process.
 545             crate::bench::benchmark(id, desc, monitor_ch, opts.nocapture, benchfn);
 546             None
 547         }
 548         DynTestFn(f) => {
 549             match strategy {
 550                 RunStrategy::InProcess => (),
 551                 _ => panic!("Cannot run dynamic test fn out-of-process"),
 552             };
 553             run_test_inner(
 554                 id,
 555                 desc,
 556                 monitor_ch,
 557                 Box::new(move || __rust_begin_short_backtrace(f)),
 558                 test_run_opts,
 559             )
 560         }
 561         StaticTestFn(f) => run_test_inner(
 562             id,
 563             desc,
 564             monitor_ch,
 565             Box::new(move || __rust_begin_short_backtrace(f)),
 566             test_run_opts,
 567         ),
 568     }
 569 }
 570
 571 /// Fixed frame used to clean the backtrace with `RUST_BACKTRACE=1`.
 572 #[inline(never)]
 573 fn __rust_begin_short_backtrace<F: FnOnce()>(f: F) {
 574     f();
 575
 576     // prevent this frame from being tail-call optimised away
 577     black_box(());
 578 }
 579
 580 fn run_test_in_process(
 581     id: TestId,
 582     desc: TestDesc,
 583     nocapture: bool,
 584     report_time: bool,
 585     testfn: Box<dyn FnOnce() + Send>,
 586     monitor_ch: Sender<CompletedTest>,
 587     time_opts: Option<time::TestTimeOptions>,
 588 ) {
 589     // Buffer for capturing standard I/O
 590     let data = Arc::new(Mutex::new(Vec::new()));
 591
 592     if !nocapture {
 593         io::set_output_capture(Some(data.clone()));
 594     }
 595
 596     let start = report_time.then(Instant::now);
 597     let result = catch_unwind(AssertUnwindSafe(testfn));
 598     let exec_time = start.map(|start| {
 599         let duration = start.elapsed();
 600         TestExecTime(duration)
 601     });
 602
 603     io::set_output_capture(None);
 604
 605     let test_result = match result {
 606         Ok(()) => calc_result(&desc, Ok(()), &time_opts, &exec_time),
 607         Err(e) => calc_result(&desc, Err(e.as_ref()), &time_opts, &exec_time),
 608     };
 609     let stdout = data.lock().unwrap_or_else(|e| e.into_inner()).to_vec();
 610     let message = CompletedTest::new(id, desc, test_result, exec_time, stdout);
 611     monitor_ch.send(message).unwrap();
 612 }
 613
 614 fn spawn_test_subprocess(
 615     id: TestId,
 616     desc: TestDesc,
 617     nocapture: bool,
 618     report_time: bool,
 619     monitor_ch: Sender<CompletedTest>,
 620     time_opts: Option<time::TestTimeOptions>,
 621 ) {
 622     let (result, test_output, exec_time) = (|| {
 623         let args = env::args().collect::<Vec<_>>();
 624         let current_exe = &args[0];
 625
 626         let mut command = Command::new(current_exe);
 627         command.env(SECONDARY_TEST_INVOKER_VAR, desc.name.as_slice());
 628         if nocapture {
 629             command.stdout(process::Stdio::inherit());
 630             command.stderr(process::Stdio::inherit());
 631         }
 632
 633         let start = report_time.then(Instant::now);
 634         let output = match command.output() {
 635             Ok(out) => out,
 636             Err(e) => {
 637                 let err = format!("Failed to spawn {} as child for test: {:?}", args[0], e);
 638                 return (TrFailed, err.into_bytes(), None);
 639             }
 640         };
 641         let exec_time = start.map(|start| {
 642             let duration = start.elapsed();
 643             TestExecTime(duration)
 644         });
 645
 646         let std::process::Output { stdout, stderr, status } = output;
 647         let mut test_output = stdout;
 648         formatters::write_stderr_delimiter(&mut test_output, &desc.name);
 649         test_output.extend_from_slice(&stderr);
 650
 651         let result = match (|| -> Result<TestResult, String> {
 652             let exit_code = get_exit_code(status)?;
 653             Ok(get_result_from_exit_code(&desc, exit_code, &time_opts, &exec_time))
 654         })() {
 655             Ok(r) => r,
 656             Err(e) => {
 657                 write!(&mut test_output, "Unexpected error: {}", e).unwrap();
 658                 TrFailed
 659             }
 660         };
 661
 662         (result, test_output, exec_time)
 663     })();
 664
 665     let message = CompletedTest::new(id, desc, result, exec_time, test_output);
 666     monitor_ch.send(message).unwrap();
 667 }
 668
 669 fn run_test_in_spawned_subprocess(desc: TestDesc, testfn: Box<dyn FnOnce() + Send>) -> ! {
 670     let builtin_panic_hook = panic::take_hook();
 671     let record_result = Arc::new(move |panic_info: Option<&'_ PanicInfo<'_>>| {
 672         let test_result = match panic_info {
 673             Some(info) => calc_result(&desc, Err(info.payload()), &None, &None),
 674             None => calc_result(&desc, Ok(()), &None, &None),
 675         };
 676
 677         // We don't support serializing TrFailedMsg, so just
 678         // print the message out to stderr.
 679         if let TrFailedMsg(msg) = &test_result {
 680             eprintln!("{}", msg);
 681         }
 682
 683         if let Some(info) = panic_info {
 684             builtin_panic_hook(info);
 685         }
 686
 687         if let TrOk = test_result {
 688             process::exit(test_result::TR_OK);
 689         } else {
 690             process::exit(test_result::TR_FAILED);
 691         }
 692     });
 693     let record_result2 = record_result.clone();
 694     panic::set_hook(Box::new(move |info| record_result2(Some(&info))));
 695     testfn();
 696     record_result(None);
 697     unreachable!("panic=abort callback should have exited the process")
 698 }