src/libtest/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 // N.B., this is also specified in this crate's Cargo.toml, but libsyntax contains logic specific to
  17 // this crate, which relies on this attribute (rather than the value of `--crate-name` passed by
  18 // cargo) to detect this crate.
  19
  20 #![crate_name = "test"]
  21 #![unstable(feature = "test", issue = "50297")]
  22 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/", test(attr(deny(warnings))))]
  23 #![feature(asm)]
  24 #![cfg_attr(any(unix, target_os = "cloudabi"), feature(libc))]
  25 #![feature(rustc_private)]
  26 #![feature(nll)]
  27 #![feature(bool_to_option)]
  28 #![feature(set_stdio)]
  29 #![feature(panic_unwind)]
  30 #![feature(staged_api)]
  31 #![feature(termination_trait_lib)]
  32 #![feature(test)]
  33
  34 // Public reexports
  35 pub use self::bench::{black_box, Bencher};
  36 pub use self::console::run_tests_console;
  37 pub use self::options::{ColorConfig, Options, OutputFormat, RunIgnored, ShouldPanic};
  38 pub use self::types::TestName::*;
  39 pub use self::types::*;
  40 pub use self::ColorConfig::*;
  41 pub use cli::TestOpts;
  42
  43 // Module to be used by rustc to compile tests in libtest
  44 pub mod test {
  45     pub use crate::{
  46         assert_test_result,
  47         bench::Bencher,
  48         cli::{parse_opts, TestOpts},
  49         filter_tests,
  50         helpers::metrics::{Metric, MetricMap},
  51         options::{Options, RunIgnored, RunStrategy, ShouldPanic},
  52         run_test, test_main, test_main_static,
  53         test_result::{TestResult, TrFailed, TrFailedMsg, TrIgnored, TrOk},
  54         time::{TestExecTime, TestTimeOptions},
  55         types::{
  56             DynTestFn, DynTestName, StaticBenchFn, StaticTestFn, StaticTestName, TestDesc,
  57             TestDescAndFn, TestName, TestType,
  58         },
  59     };
  60 }
  61
  62 use std::{
  63     env, io,
  64     io::prelude::Write,
  65     panic::{self, catch_unwind, AssertUnwindSafe, PanicInfo},
  66     process::{self, Command, Termination},
  67     sync::mpsc::{channel, Sender},
  68     sync::{Arc, Mutex},
  69     thread,
  70     time::{Duration, Instant},
  71 };
  72
  73 pub mod bench;
  74 mod cli;
  75 mod console;
  76 mod event;
  77 mod formatters;
  78 mod helpers;
  79 mod options;
  80 pub mod stats;
  81 mod test_result;
  82 mod time;
  83 mod types;
  84
  85 #[cfg(test)]
  86 mod tests;
  87
  88 use event::{CompletedTest, TestEvent};
  89 use helpers::concurrency::get_concurrency;
  90 use helpers::exit_code::get_exit_code;
  91 use helpers::sink::Sink;
  92 use options::{Concurrent, RunStrategy};
  93 use test_result::*;
  94 use time::TestExecTime;
  95
  96 // Process exit code to be used to indicate test failures.
  97 const ERROR_EXIT_CODE: i32 = 101;
  98
  99 const SECONDARY_TEST_INVOKER_VAR: &'static str = "__RUST_TEST_INVOKE";
 100
 101 // The default console test runner. It accepts the command line
 102 // arguments and a vector of test_descs.
 103 pub fn test_main(args: &[String], tests: Vec<TestDescAndFn>, options: Option<Options>) {
 104     let mut opts = match cli::parse_opts(args) {
 105         Some(Ok(o)) => o,
 106         Some(Err(msg)) => {
 107             eprintln!("error: {}", msg);
 108             process::exit(ERROR_EXIT_CODE);
 109         }
 110         None => return,
 111     };
 112     if let Some(options) = options {
 113         opts.options = options;
 114     }
 115     if opts.list {
 116         if let Err(e) = console::list_tests_console(&opts, tests) {
 117             eprintln!("error: io error when listing tests: {:?}", e);
 118             process::exit(ERROR_EXIT_CODE);
 119         }
 120     } else {
 121         match console::run_tests_console(&opts, tests) {
 122             Ok(true) => {}
 123             Ok(false) => process::exit(ERROR_EXIT_CODE),
 124             Err(e) => {
 125                 eprintln!("error: io error when listing tests: {:?}", e);
 126                 process::exit(ERROR_EXIT_CODE);
 127             }
 128         }
 129     }
 130 }
 131
 132 /// A variant optimized for invocation with a static test vector.
 133 /// This will panic (intentionally) when fed any dynamic tests.
 134 ///
 135 /// This is the entry point for the main function generated by `rustc --test`
 136 /// when panic=unwind.
 137 pub fn test_main_static(tests: &[&TestDescAndFn]) {
 138     let args = env::args().collect::<Vec<_>>();
 139     let owned_tests: Vec<_> = tests.iter().map(make_owned_test).collect();
 140     test_main(&args, owned_tests, None)
 141 }
 142
 143 /// A variant optimized for invocation with a static test vector.
 144 /// This will panic (intentionally) when fed any dynamic tests.
 145 ///
 146 /// Runs tests in panic=abort mode, which involves spawning subprocesses for
 147 /// tests.
 148 ///
 149 /// This is the entry point for the main function generated by `rustc --test`
 150 /// when panic=abort.
 151 pub fn test_main_static_abort(tests: &[&TestDescAndFn]) {
 152     // If we're being run in SpawnedSecondary mode, run the test here. run_test
 153     // will then exit the process.
 154     if let Ok(name) = env::var(SECONDARY_TEST_INVOKER_VAR) {
 155         env::remove_var(SECONDARY_TEST_INVOKER_VAR);
 156         let test = tests
 157             .iter()
 158             .filter(|test| test.desc.name.as_slice() == name)
 159             .map(make_owned_test)
 160             .next()
 161             .expect(&format!("couldn't find a test with the provided name '{}'", name));
 162         let TestDescAndFn { desc, testfn } = test;
 163         let testfn = match testfn {
 164             StaticTestFn(f) => f,
 165             _ => panic!("only static tests are supported"),
 166         };
 167         run_test_in_spawned_subprocess(desc, Box::new(testfn));
 168     }
 169
 170     let args = env::args().collect::<Vec<_>>();
 171     let owned_tests: Vec<_> = tests.iter().map(make_owned_test).collect();
 172     test_main(&args, owned_tests, Some(Options::new().panic_abort(true)))
 173 }
 174
 175 /// Clones static values for putting into a dynamic vector, which test_main()
 176 /// needs to hand out ownership of tests to parallel test runners.
 177 ///
 178 /// This will panic when fed any dynamic tests, because they cannot be cloned.
 179 fn make_owned_test(test: &&TestDescAndFn) -> TestDescAndFn {
 180     match test.testfn {
 181         StaticTestFn(f) => TestDescAndFn { testfn: StaticTestFn(f), desc: test.desc.clone() },
 182         StaticBenchFn(f) => TestDescAndFn { testfn: StaticBenchFn(f), desc: test.desc.clone() },
 183         _ => panic!("non-static tests passed to test::test_main_static"),
 184     }
 185 }
 186
 187 /// Invoked when unit tests terminate. Should panic if the unit
 188 /// Tests is considered a failure. By default, invokes `report()`
 189 /// and checks for a `0` result.
 190 pub fn assert_test_result<T: Termination>(result: T) {
 191     let code = result.report();
 192     assert_eq!(
 193         code, 0,
 194         "the test returned a termination value with a non-zero status code ({}) \
 195          which indicates a failure",
 196         code
 197     );
 198 }
 199
 200 pub fn run_tests<F>(
 201     opts: &TestOpts,
 202     tests: Vec<TestDescAndFn>,
 203     mut notify_about_test_event: F,
 204 ) -> io::Result<()>
 205 where
 206     F: FnMut(TestEvent) -> io::Result<()>,
 207 {
 208     use std::collections::{self, HashMap};
 209     use std::hash::BuildHasherDefault;
 210     use std::sync::mpsc::RecvTimeoutError;
 211     // Use a deterministic hasher
 212     type TestMap =
 213         HashMap<TestDesc, Instant, BuildHasherDefault<collections::hash_map::DefaultHasher>>;
 214
 215     let tests_len = tests.len();
 216
 217     let mut filtered_tests = filter_tests(opts, tests);
 218     if !opts.bench_benchmarks {
 219         filtered_tests = convert_benchmarks_to_tests(filtered_tests);
 220     }
 221
 222     let filtered_tests = {
 223         let mut filtered_tests = filtered_tests;
 224         for test in filtered_tests.iter_mut() {
 225             test.desc.name = test.desc.name.with_padding(test.testfn.padding());
 226         }
 227
 228         filtered_tests
 229     };
 230
 231     let filtered_out = tests_len - filtered_tests.len();
 232     let event = TestEvent::TeFilteredOut(filtered_out);
 233     notify_about_test_event(event)?;
 234
 235     let filtered_descs = filtered_tests.iter().map(|t| t.desc.clone()).collect();
 236
 237     let event = TestEvent::TeFiltered(filtered_descs);
 238     notify_about_test_event(event)?;
 239
 240     let (filtered_tests, filtered_benchs): (Vec<_>, _) =
 241         filtered_tests.into_iter().partition(|e| match e.testfn {
 242             StaticTestFn(_) | DynTestFn(_) => true,
 243             _ => false,
 244         });
 245
 246     let concurrency = opts.test_threads.unwrap_or_else(get_concurrency);
 247
 248     let mut remaining = filtered_tests;
 249     remaining.reverse();
 250     let mut pending = 0;
 251
 252     let (tx, rx) = channel::<CompletedTest>();
 253     let run_strategy = if opts.options.panic_abort && !opts.force_run_in_process {
 254         RunStrategy::SpawnPrimary
 255     } else {
 256         RunStrategy::InProcess
 257     };
 258
 259     let mut running_tests: TestMap = HashMap::default();
 260
 261     fn get_timed_out_tests(running_tests: &mut TestMap) -> Vec<TestDesc> {
 262         let now = Instant::now();
 263         let timed_out = running_tests
 264             .iter()
 265             .filter_map(|(desc, timeout)| if &now >= timeout { Some(desc.clone()) } else { None })
 266             .collect();
 267         for test in &timed_out {
 268             running_tests.remove(test);
 269         }
 270         timed_out
 271     };
 272
 273     fn calc_timeout(running_tests: &TestMap) -> Option<Duration> {
 274         running_tests.values().min().map(|next_timeout| {
 275             let now = Instant::now();
 276             if *next_timeout >= now { *next_timeout - now } else { Duration::new(0, 0) }
 277         })
 278     };
 279
 280     if concurrency == 1 {
 281         while !remaining.is_empty() {
 282             let test = remaining.pop().unwrap();
 283             let event = TestEvent::TeWait(test.desc.clone());
 284             notify_about_test_event(event)?;
 285             run_test(opts, !opts.run_tests, test, run_strategy, tx.clone(), Concurrent::No);
 286             let completed_test = rx.recv().unwrap();
 287
 288             let event = TestEvent::TeResult(completed_test);
 289             notify_about_test_event(event)?;
 290         }
 291     } else {
 292         while pending > 0 || !remaining.is_empty() {
 293             while pending < concurrency && !remaining.is_empty() {
 294                 let test = remaining.pop().unwrap();
 295                 let timeout = time::get_default_test_timeout();
 296                 running_tests.insert(test.desc.clone(), timeout);
 297
 298                 let event = TestEvent::TeWait(test.desc.clone());
 299                 notify_about_test_event(event)?; //here no pad
 300                 run_test(opts, !opts.run_tests, test, run_strategy, tx.clone(), Concurrent::Yes);
 301                 pending += 1;
 302             }
 303
 304             let mut res;
 305             loop {
 306                 if let Some(timeout) = calc_timeout(&running_tests) {
 307                     res = rx.recv_timeout(timeout);
 308                     for test in get_timed_out_tests(&mut running_tests) {
 309                         let event = TestEvent::TeTimeout(test);
 310                         notify_about_test_event(event)?;
 311                     }
 312
 313                     match res {
 314                         Err(RecvTimeoutError::Timeout) => {
 315                             // Result is not yet ready, continue waiting.
 316                         }
 317                         _ => {
 318                             // We've got a result, stop the loop.
 319                             break;
 320                         }
 321                     }
 322                 } else {
 323                     res = rx.recv().map_err(|_| RecvTimeoutError::Disconnected);
 324                     break;
 325                 }
 326             }
 327
 328             let completed_test = res.unwrap();
 329             running_tests.remove(&completed_test.desc);
 330
 331             let event = TestEvent::TeResult(completed_test);
 332             notify_about_test_event(event)?;
 333             pending -= 1;
 334         }
 335     }
 336
 337     if opts.bench_benchmarks {
 338         // All benchmarks run at the end, in serial.
 339         for b in filtered_benchs {
 340             let event = TestEvent::TeWait(b.desc.clone());
 341             notify_about_test_event(event)?;
 342             run_test(opts, false, b, run_strategy, tx.clone(), Concurrent::No);
 343             let completed_test = rx.recv().unwrap();
 344
 345             let event = TestEvent::TeResult(completed_test);
 346             notify_about_test_event(event)?;
 347         }
 348     }
 349     Ok(())
 350 }
 351
 352 pub fn filter_tests(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> Vec<TestDescAndFn> {
 353     let mut filtered = tests;
 354     let matches_filter = |test: &TestDescAndFn, filter: &str| {
 355         let test_name = test.desc.name.as_slice();
 356
 357         match opts.filter_exact {
 358             true => test_name == filter,
 359             false => test_name.contains(filter),
 360         }
 361     };
 362
 363     // Remove tests that don't match the test filter
 364     if let Some(ref filter) = opts.filter {
 365         filtered.retain(|test| matches_filter(test, filter));
 366     }
 367
 368     // Skip tests that match any of the skip filters
 369     filtered.retain(|test| !opts.skip.iter().any(|sf| matches_filter(test, sf)));
 370
 371     // Excludes #[should_panic] tests
 372     if opts.exclude_should_panic {
 373         filtered.retain(|test| test.desc.should_panic == ShouldPanic::No);
 374     }
 375
 376     // maybe unignore tests
 377     match opts.run_ignored {
 378         RunIgnored::Yes => {
 379             filtered.iter_mut().for_each(|test| test.desc.ignore = false);
 380         }
 381         RunIgnored::Only => {
 382             filtered.retain(|test| test.desc.ignore);
 383             filtered.iter_mut().for_each(|test| test.desc.ignore = false);
 384         }
 385         RunIgnored::No => {}
 386     }
 387
 388     // Sort the tests alphabetically
 389     filtered.sort_by(|t1, t2| t1.desc.name.as_slice().cmp(t2.desc.name.as_slice()));
 390
 391     filtered
 392 }
 393
 394 pub fn convert_benchmarks_to_tests(tests: Vec<TestDescAndFn>) -> Vec<TestDescAndFn> {
 395     // convert benchmarks to tests, if we're not benchmarking them
 396     tests
 397         .into_iter()
 398         .map(|x| {
 399             let testfn = match x.testfn {
 400                 DynBenchFn(bench) => DynTestFn(Box::new(move || {
 401                     bench::run_once(|b| __rust_begin_short_backtrace(|| bench.run(b)))
 402                 })),
 403                 StaticBenchFn(benchfn) => DynTestFn(Box::new(move || {
 404                     bench::run_once(|b| __rust_begin_short_backtrace(|| benchfn(b)))
 405                 })),
 406                 f => f,
 407             };
 408             TestDescAndFn { desc: x.desc, testfn }
 409         })
 410         .collect()
 411 }
 412
 413 pub fn run_test(
 414     opts: &TestOpts,
 415     force_ignore: bool,
 416     test: TestDescAndFn,
 417     strategy: RunStrategy,
 418     monitor_ch: Sender<CompletedTest>,
 419     concurrency: Concurrent,
 420 ) {
 421     let TestDescAndFn { desc, testfn } = test;
 422
 423     // Emscripten can catch panics but other wasm targets cannot
 424     let ignore_because_no_process_support = desc.should_panic != ShouldPanic::No
 425         && cfg!(target_arch = "wasm32")
 426         && !cfg!(target_os = "emscripten");
 427
 428     if force_ignore || desc.ignore || ignore_because_no_process_support {
 429         let message = CompletedTest::new(desc, TrIgnored, None, Vec::new());
 430         monitor_ch.send(message).unwrap();
 431         return;
 432     }
 433
 434     struct TestRunOpts {
 435         pub strategy: RunStrategy,
 436         pub nocapture: bool,
 437         pub concurrency: Concurrent,
 438         pub time: Option<time::TestTimeOptions>,
 439     }
 440
 441     fn run_test_inner(
 442         desc: TestDesc,
 443         monitor_ch: Sender<CompletedTest>,
 444         testfn: Box<dyn FnOnce() + Send>,
 445         opts: TestRunOpts,
 446     ) {
 447         let concurrency = opts.concurrency;
 448         let name = desc.name.clone();
 449
 450         let runtest = move || match opts.strategy {
 451             RunStrategy::InProcess => run_test_in_process(
 452                 desc,
 453                 opts.nocapture,
 454                 opts.time.is_some(),
 455                 testfn,
 456                 monitor_ch,
 457                 opts.time,
 458             ),
 459             RunStrategy::SpawnPrimary => spawn_test_subprocess(
 460                 desc,
 461                 opts.nocapture,
 462                 opts.time.is_some(),
 463                 monitor_ch,
 464                 opts.time,
 465             ),
 466         };
 467
 468         // If the platform is single-threaded we're just going to run
 469         // the test synchronously, regardless of the concurrency
 470         // level.
 471         let supports_threads = !cfg!(target_os = "emscripten") && !cfg!(target_arch = "wasm32");
 472         if concurrency == Concurrent::Yes && supports_threads {
 473             let cfg = thread::Builder::new().name(name.as_slice().to_owned());
 474             cfg.spawn(runtest).unwrap();
 475         } else {
 476             runtest();
 477         }
 478     }
 479
 480     let test_run_opts =
 481         TestRunOpts { strategy, nocapture: opts.nocapture, concurrency, time: opts.time_options };
 482
 483     match testfn {
 484         DynBenchFn(bencher) => {
 485             // Benchmarks aren't expected to panic, so we run them all in-process.
 486             crate::bench::benchmark(desc, monitor_ch, opts.nocapture, |harness| {
 487                 bencher.run(harness)
 488             });
 489         }
 490         StaticBenchFn(benchfn) => {
 491             // Benchmarks aren't expected to panic, so we run them all in-process.
 492             crate::bench::benchmark(desc, monitor_ch, opts.nocapture, benchfn);
 493         }
 494         DynTestFn(f) => {
 495             match strategy {
 496                 RunStrategy::InProcess => (),
 497                 _ => panic!("Cannot run dynamic test fn out-of-process"),
 498             };
 499             run_test_inner(
 500                 desc,
 501                 monitor_ch,
 502                 Box::new(move || __rust_begin_short_backtrace(f)),
 503                 test_run_opts,
 504             );
 505         }
 506         StaticTestFn(f) => run_test_inner(
 507             desc,
 508             monitor_ch,
 509             Box::new(move || __rust_begin_short_backtrace(f)),
 510             test_run_opts,
 511         ),
 512     }
 513 }
 514
 515 /// Fixed frame used to clean the backtrace with `RUST_BACKTRACE=1`.
 516 #[inline(never)]
 517 fn __rust_begin_short_backtrace<F: FnOnce()>(f: F) {
 518     f()
 519 }
 520
 521 fn run_test_in_process(
 522     desc: TestDesc,
 523     nocapture: bool,
 524     report_time: bool,
 525     testfn: Box<dyn FnOnce() + Send>,
 526     monitor_ch: Sender<CompletedTest>,
 527     time_opts: Option<time::TestTimeOptions>,
 528 ) {
 529     // Buffer for capturing standard I/O
 530     let data = Arc::new(Mutex::new(Vec::new()));
 531
 532     let oldio = if !nocapture {
 533         Some((
 534             io::set_print(Some(Sink::new_boxed(&data))),
 535             io::set_panic(Some(Sink::new_boxed(&data))),
 536         ))
 537     } else {
 538         None
 539     };
 540
 541     let start = report_time.then(Instant::now);
 542     let result = catch_unwind(AssertUnwindSafe(testfn));
 543     let exec_time = start.map(|start| {
 544         let duration = start.elapsed();
 545         TestExecTime(duration)
 546     });
 547
 548     if let Some((printio, panicio)) = oldio {
 549         io::set_print(printio);
 550         io::set_panic(panicio);
 551     }
 552
 553     let test_result = match result {
 554         Ok(()) => calc_result(&desc, Ok(()), &time_opts, &exec_time),
 555         Err(e) => calc_result(&desc, Err(e.as_ref()), &time_opts, &exec_time),
 556     };
 557     let stdout = data.lock().unwrap().to_vec();
 558     let message = CompletedTest::new(desc, test_result, exec_time, stdout);
 559     monitor_ch.send(message).unwrap();
 560 }
 561
 562 fn spawn_test_subprocess(
 563     desc: TestDesc,
 564     nocapture: bool,
 565     report_time: bool,
 566     monitor_ch: Sender<CompletedTest>,
 567     time_opts: Option<time::TestTimeOptions>,
 568 ) {
 569     let (result, test_output, exec_time) = (|| {
 570         let args = env::args().collect::<Vec<_>>();
 571         let current_exe = &args[0];
 572
 573         let mut command = Command::new(current_exe);
 574         command.env(SECONDARY_TEST_INVOKER_VAR, desc.name.as_slice());
 575         if nocapture {
 576             command.stdout(process::Stdio::inherit());
 577             command.stderr(process::Stdio::inherit());
 578         }
 579
 580         let start = report_time.then(Instant::now);
 581         let output = match command.output() {
 582             Ok(out) => out,
 583             Err(e) => {
 584                 let err = format!("Failed to spawn {} as child for test: {:?}", args[0], e);
 585                 return (TrFailed, err.into_bytes(), None);
 586             }
 587         };
 588         let exec_time = start.map(|start| {
 589             let duration = start.elapsed();
 590             TestExecTime(duration)
 591         });
 592
 593         let std::process::Output { stdout, stderr, status } = output;
 594         let mut test_output = stdout;
 595         formatters::write_stderr_delimiter(&mut test_output, &desc.name);
 596         test_output.extend_from_slice(&stderr);
 597
 598         let result = match (|| -> Result<TestResult, String> {
 599             let exit_code = get_exit_code(status)?;
 600             Ok(get_result_from_exit_code(&desc, exit_code, &time_opts, &exec_time))
 601         })() {
 602             Ok(r) => r,
 603             Err(e) => {
 604                 write!(&mut test_output, "Unexpected error: {}", e).unwrap();
 605                 TrFailed
 606             }
 607         };
 608
 609         (result, test_output, exec_time)
 610     })();
 611
 612     let message = CompletedTest::new(desc, result, exec_time, test_output);
 613     monitor_ch.send(message).unwrap();
 614 }
 615
 616 fn run_test_in_spawned_subprocess(desc: TestDesc, testfn: Box<dyn FnOnce() + Send>) -> ! {
 617     let builtin_panic_hook = panic::take_hook();
 618     let record_result = Arc::new(move |panic_info: Option<&'_ PanicInfo<'_>>| {
 619         let test_result = match panic_info {
 620             Some(info) => calc_result(&desc, Err(info.payload()), &None, &None),
 621             None => calc_result(&desc, Ok(()), &None, &None),
 622         };
 623
 624         // We don't support serializing TrFailedMsg, so just
 625         // print the message out to stderr.
 626         if let TrFailedMsg(msg) = &test_result {
 627             eprintln!("{}", msg);
 628         }
 629
 630         if let Some(info) = panic_info {
 631             builtin_panic_hook(info);
 632         }
 633
 634         if let TrOk = test_result {
 635             process::exit(test_result::TR_OK);
 636         } else {
 637             process::exit(test_result::TR_FAILED);
 638         }
 639     });
 640     let record_result2 = record_result.clone();
 641     panic::set_hook(Box::new(move |info| record_result2(Some(&info))));
 642     testfn();
 643     record_result(None);
 644     unreachable!("panic=abort callback should have exited the process")
 645 }