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    //! Support code for rustc's built in unit-test and micro-benchmarking
    //! framework.
    //!
    //! Almost all user code will only be interested in `Bencher` and
    //! `black_box`. All other interactions (such as writing tests and
    //! benchmarks themselves) should be done via the `#[test]` and
    //! `#[bench]` attributes.
    //!
    //! See the [Testing Chapter](../book/ch11-00-testing.html) of the book for more details.

    // Currently, not much of this is meant for users. It is intended to
    // support the simplest interface possible for representing and
    // running tests while providing a base that other test frameworks may
    // build off of.

    // N.B., this is also specified in this crate's Cargo.toml, but libsyntax contains logic specific to
    // this crate, which relies on this attribute (rather than the value of `--crate-name` passed by
    // cargo) to detect this crate.

    #![crate_name = "test"]
    #![unstable(feature = "test", issue = "50297")]
    #![doc(html_root_url = "https://doc.rust-lang.org/nightly/", test(attr(deny(warnings))))]
    #![feature(asm)]
    #![cfg_attr(any(unix, target_os = "cloudabi"), feature(libc))]
    #![feature(rustc_private)]
    #![feature(nll)]
    #![feature(bool_to_option)]
    #![feature(set_stdio)]
    #![feature(panic_unwind)]
    #![feature(staged_api)]
    #![feature(termination_trait_lib)]
    #![feature(test)]

    // Public reexports
    pub use self::ColorConfig::*;
    pub use self::types::*;
    pub use self::types::TestName::*;
    pub use self::options::{ColorConfig, Options, OutputFormat, RunIgnored, ShouldPanic};
    pub use self::bench::{Bencher, black_box};
    pub use self::console::run_tests_console;
    pub use cli::TestOpts;

    // Module to be used by rustc to compile tests in libtest
    pub mod test {
        pub use crate::{
            bench::Bencher,
            cli::{parse_opts, TestOpts},
            helpers::metrics::{Metric, MetricMap},
            options::{ShouldPanic, Options, RunIgnored, RunStrategy},
            test_result::{TestResult, TrFailed, TrFailedMsg, TrIgnored, TrOk},
            time::{TestTimeOptions, TestExecTime},
            types::{
                DynTestFn, DynTestName, StaticBenchFn, StaticTestFn, StaticTestName,
                TestDesc, TestDescAndFn, TestName, TestType,
            },
            assert_test_result, filter_tests, run_test, test_main, test_main_static,
        };
    }

    use std::{
        env,
        io,
        io::prelude::Write,
        panic::{self, catch_unwind, AssertUnwindSafe, PanicInfo},
        process,
        process::{Command, Termination},
        sync::mpsc::{channel, Sender},
        sync::{Arc, Mutex},
        thread,
        time::{Duration, Instant},
    };

    pub mod stats;
    pub mod bench;
    mod formatters;
    mod cli;
    mod console;
    mod event;
    mod helpers;
    mod time;
    mod types;
    mod options;
    mod test_result;

    #[cfg(test)]
    mod tests;

    use test_result::*;
    use time::TestExecTime;
    use options::{RunStrategy, Concurrent};
    use event::{CompletedTest, TestEvent};
    use helpers::sink::Sink;
    use helpers::concurrency::get_concurrency;
    use helpers::exit_code::get_exit_code;

    // Process exit code to be used to indicate test failures.
    const ERROR_EXIT_CODE: i32 = 101;

    const SECONDARY_TEST_INVOKER_VAR: &'static str = "__RUST_TEST_INVOKE";

    // The default console test runner. It accepts the command line
    // arguments and a vector of test_descs.
    pub fn test_main(args: &[String], tests: Vec<TestDescAndFn>, options: Option<Options>) {
        let mut opts = match cli::parse_opts(args) {
            Some(Ok(o)) => o,
            Some(Err(msg)) => {
                eprintln!("error: {}", msg);
                process::exit(ERROR_EXIT_CODE);
            }
            None => return,
        };
        if let Some(options) = options {
            opts.options = options;
        }
        if opts.list {
            if let Err(e) = console::list_tests_console(&opts, tests) {
                eprintln!("error: io error when listing tests: {:?}", e);
                process::exit(ERROR_EXIT_CODE);
            }
        } else {
            match console::run_tests_console(&opts, tests) {
                Ok(true) => {}
                Ok(false) => process::exit(ERROR_EXIT_CODE),
                Err(e) => {
                    eprintln!("error: io error when listing tests: {:?}", e);
                    process::exit(ERROR_EXIT_CODE);
                }
            }
        }
    }

    /// A variant optimized for invocation with a static test vector.
    /// This will panic (intentionally) when fed any dynamic tests.
    ///
    /// This is the entry point for the main function generated by `rustc --test`
    /// when panic=unwind.
    pub fn test_main_static(tests: &[&TestDescAndFn]) {
        let args = env::args().collect::<Vec<_>>();
        let owned_tests: Vec<_> = tests.iter().map(make_owned_test).collect();
        test_main(&args, owned_tests, None)
    }

    /// A variant optimized for invocation with a static test vector.
    /// This will panic (intentionally) when fed any dynamic tests.
    ///
    /// Runs tests in panic=abort mode, which involves spawning subprocesses for
    /// tests.
    ///
    /// This is the entry point for the main function generated by `rustc --test`
    /// when panic=abort.
    pub fn test_main_static_abort(tests: &[&TestDescAndFn]) {
        // If we're being run in SpawnedSecondary mode, run the test here. run_test
        // will then exit the process.
        if let Ok(name) = env::var(SECONDARY_TEST_INVOKER_VAR) {
            let test = tests
                .iter()
                .filter(|test| test.desc.name.as_slice() == name)
                .map(make_owned_test)
                .next()
                .expect("couldn't find a test with the provided name");
            let TestDescAndFn { desc, testfn } = test;
            let testfn = match testfn {
                StaticTestFn(f) => f,
                _ => panic!("only static tests are supported"),
            };
            run_test_in_spawned_subprocess(desc, Box::new(testfn));
        }

        let args = env::args().collect::<Vec<_>>();
        let owned_tests: Vec<_> = tests.iter().map(make_owned_test).collect();
        test_main(&args, owned_tests, Some(Options::new().panic_abort(true)))
    }

    /// Clones static values for putting into a dynamic vector, which test_main()
    /// needs to hand out ownership of tests to parallel test runners.
    ///
    /// This will panic when fed any dynamic tests, because they cannot be cloned.
    fn make_owned_test(test: &&TestDescAndFn) -> TestDescAndFn {
        match test.testfn {
            StaticTestFn(f) => TestDescAndFn {
                testfn: StaticTestFn(f),
                desc: test.desc.clone(),
            },
            StaticBenchFn(f) => TestDescAndFn {
                testfn: StaticBenchFn(f),
                desc: test.desc.clone(),
            },
            _ => panic!("non-static tests passed to test::test_main_static"),
        }
    }

    /// Invoked when unit tests terminate. Should panic if the unit
    /// Tests is considered a failure. By default, invokes `report()`
    /// and checks for a `0` result.
    pub fn assert_test_result<T: Termination>(result: T) {
        let code = result.report();
        assert_eq!(
            code, 0,
            "the test returned a termination value with a non-zero status code ({}) \
             which indicates a failure",
            code
        );
    }

    pub fn run_tests<F>(
        opts: &TestOpts,
        tests: Vec<TestDescAndFn>,
        mut notify_about_test_event: F
    ) -> io::Result<()>
    where
        F: FnMut(TestEvent) -> io::Result<()>,
    {
        use std::collections::{self, HashMap};
        use std::hash::BuildHasherDefault;
        use std::sync::mpsc::RecvTimeoutError;
        // Use a deterministic hasher
        type TestMap =
            HashMap<TestDesc, Instant, BuildHasherDefault<collections::hash_map::DefaultHasher>>;

        let tests_len = tests.len();

        let mut filtered_tests = filter_tests(opts, tests);
        if !opts.bench_benchmarks {
            filtered_tests = convert_benchmarks_to_tests(filtered_tests);
        }

        let filtered_tests = {
            let mut filtered_tests = filtered_tests;
            for test in filtered_tests.iter_mut() {
                test.desc.name = test.desc.name.with_padding(test.testfn.padding());
            }

            filtered_tests
        };

        let filtered_out = tests_len - filtered_tests.len();
        let event = TestEvent::TeFilteredOut(filtered_out);
        notify_about_test_event(event)?;

        let filtered_descs = filtered_tests.iter().map(|t| t.desc.clone()).collect();

        let event = TestEvent::TeFiltered(filtered_descs);
        notify_about_test_event(event)?;

        let (filtered_tests, filtered_benchs): (Vec<_>, _) =
            filtered_tests.into_iter().partition(|e| match e.testfn {
                StaticTestFn(_) | DynTestFn(_) => true,
                _ => false,
            });

        let concurrency = opts.test_threads.unwrap_or_else(get_concurrency);

        let mut remaining = filtered_tests;
        remaining.reverse();
        let mut pending = 0;

        let (tx, rx) = channel::<CompletedTest>();
        let run_strategy = if opts.options.panic_abort && !opts.force_run_in_process {
            RunStrategy::SpawnPrimary
        } else {
            RunStrategy::InProcess
        };

        let mut running_tests: TestMap = HashMap::default();

        fn get_timed_out_tests(running_tests: &mut TestMap) -> Vec<TestDesc> {
            let now = Instant::now();
            let timed_out = running_tests
                .iter()
                .filter_map(|(desc, timeout)| {
                    if &now >= timeout {
                        Some(desc.clone())
                    } else {
                        None
                    }
                })
                .collect();
            for test in &timed_out {
                running_tests.remove(test);
            }
            timed_out
        };

        fn calc_timeout(running_tests: &TestMap) -> Option<Duration> {
            running_tests.values().min().map(|next_timeout| {
                let now = Instant::now();
                if *next_timeout >= now {
                    *next_timeout - now
                } else {
                    Duration::new(0, 0)
                }
            })
        };

        if concurrency == 1 {
            while !remaining.is_empty() {
                let test = remaining.pop().unwrap();
                let event = TestEvent::TeWait(test.desc.clone());
                notify_about_test_event(event)?;
                run_test(opts, !opts.run_tests, test, run_strategy, tx.clone(), Concurrent::No);
                let completed_test = rx.recv().unwrap();

                let event = TestEvent::TeResult(completed_test);
                notify_about_test_event(event)?;
            }
        } else {
            while pending > 0 || !remaining.is_empty() {
                while pending < concurrency && !remaining.is_empty() {
                    let test = remaining.pop().unwrap();
                    let timeout = time::get_default_test_timeout();
                    running_tests.insert(test.desc.clone(), timeout);

                    let event = TestEvent::TeWait(test.desc.clone());
                    notify_about_test_event(event)?; //here no pad
                    run_test(opts, !opts.run_tests, test, run_strategy, tx.clone(), Concurrent::Yes);
                    pending += 1;
                }

                let mut res;
                loop {
                    if let Some(timeout) = calc_timeout(&running_tests) {
                        res = rx.recv_timeout(timeout);
                        for test in get_timed_out_tests(&mut running_tests) {
                            let event = TestEvent::TeTimeout(test);
                            notify_about_test_event(event)?;
                        }

                        match res {
                            Err(RecvTimeoutError::Timeout) => {
                                // Result is not yet ready, continue waiting.
                            }
                            _ => {
                                // We've got a result, stop the loop.
                                break;
                            }
                        }
                    } else {
                        res = rx.recv().map_err(|_| RecvTimeoutError::Disconnected);
                        break;
                    }
                }

                let completed_test = res.unwrap();
                running_tests.remove(&completed_test.desc);

                let event = TestEvent::TeResult(completed_test);
                notify_about_test_event(event)?;
                pending -= 1;
            }
        }

        if opts.bench_benchmarks {
            // All benchmarks run at the end, in serial.
            for b in filtered_benchs {
                let event = TestEvent::TeWait(b.desc.clone());
                notify_about_test_event(event)?;
                run_test(opts, false, b, run_strategy, tx.clone(), Concurrent::No);
                let completed_test = rx.recv().unwrap();

                let event = TestEvent::TeResult(completed_test);
                notify_about_test_event(event)?;
            }
        }
        Ok(())
    }

    pub fn filter_tests(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> Vec<TestDescAndFn> {
        let mut filtered = tests;
        let matches_filter = |test: &TestDescAndFn, filter: &str| {
            let test_name = test.desc.name.as_slice();

            match opts.filter_exact {
                true => test_name == filter,
                false => test_name.contains(filter),
            }
        };

        // Remove tests that don't match the test filter
        if let Some(ref filter) = opts.filter {
            filtered.retain(|test| matches_filter(test, filter));
        }

        // Skip tests that match any of the skip filters
        filtered.retain(|test| !opts.skip.iter().any(|sf| matches_filter(test, sf)));

        // Excludes #[should_panic] tests
        if opts.exclude_should_panic {
            filtered.retain(|test| test.desc.should_panic == ShouldPanic::No);
        }

        // maybe unignore tests
        match opts.run_ignored {
            RunIgnored::Yes => {
                filtered
                    .iter_mut()
                    .for_each(|test| test.desc.ignore = false);
            }
            RunIgnored::Only => {
                filtered.retain(|test| test.desc.ignore);
                filtered
                    .iter_mut()
                    .for_each(|test| test.desc.ignore = false);
            }
            RunIgnored::No => {}
        }

        // Sort the tests alphabetically
        filtered.sort_by(|t1, t2| t1.desc.name.as_slice().cmp(t2.desc.name.as_slice()));

        filtered
    }

    pub fn convert_benchmarks_to_tests(tests: Vec<TestDescAndFn>) -> Vec<TestDescAndFn> {
        // convert benchmarks to tests, if we're not benchmarking them
        tests
            .into_iter()
            .map(|x| {
                let testfn = match x.testfn {
                    DynBenchFn(bench) => DynTestFn(Box::new(move || {
                        bench::run_once(|b| __rust_begin_short_backtrace(|| bench.run(b)))
                    })),
                    StaticBenchFn(benchfn) => DynTestFn(Box::new(move || {
                        bench::run_once(|b| __rust_begin_short_backtrace(|| benchfn(b)))
                    })),
                    f => f,
                };
                TestDescAndFn {
                    desc: x.desc,
                    testfn,
                }
            })
            .collect()
    }

    pub fn run_test(
        opts: &TestOpts,
        force_ignore: bool,
        test: TestDescAndFn,
        strategy: RunStrategy,
        monitor_ch: Sender<CompletedTest>,
        concurrency: Concurrent,
    ) {
        let TestDescAndFn { desc, testfn } = test;

        // Emscripten can catch panics but other wasm targets cannot
        let ignore_because_no_process_support = desc.should_panic != ShouldPanic::No
            && cfg!(target_arch = "wasm32") && !cfg!(target_os = "emscripten");

        if force_ignore || desc.ignore || ignore_because_no_process_support {
            let message = CompletedTest::new(desc, TrIgnored, None, Vec::new());
            monitor_ch.send(message).unwrap();
            return;
        }

        struct TestRunOpts {
            pub strategy: RunStrategy,
            pub nocapture: bool,
            pub concurrency: Concurrent,
            pub time: Option<time::TestTimeOptions>,
        }

        fn run_test_inner(
            desc: TestDesc,
            monitor_ch: Sender<CompletedTest>,
            testfn: Box<dyn FnOnce() + Send>,
            opts: TestRunOpts,
        ) {
            let concurrency = opts.concurrency;
            let name = desc.name.clone();

            let runtest = move || {
                match opts.strategy {
                    RunStrategy::InProcess =>
                        run_test_in_process(
                            desc,
                            opts.nocapture,
                            opts.time.is_some(),
                            testfn,
                            monitor_ch,
                            opts.time
                        ),
                    RunStrategy::SpawnPrimary =>
                        spawn_test_subprocess(desc, opts.time.is_some(), monitor_ch, opts.time),
                }
            };

            // If the platform is single-threaded we're just going to run
            // the test synchronously, regardless of the concurrency
            // level.
            let supports_threads = !cfg!(target_os = "emscripten") && !cfg!(target_arch = "wasm32");
            if concurrency == Concurrent::Yes && supports_threads {
                let cfg = thread::Builder::new().name(name.as_slice().to_owned());
                cfg.spawn(runtest).unwrap();
            } else {
                runtest();
            }
        }

        let test_run_opts = TestRunOpts {
            strategy,
            nocapture: opts.nocapture,
            concurrency,
            time: opts.time_options
        };

        match testfn {
            DynBenchFn(bencher) => {
                // Benchmarks aren't expected to panic, so we run them all in-process.
                crate::bench::benchmark(desc, monitor_ch, opts.nocapture, |harness| {
                    bencher.run(harness)
                });
            }
            StaticBenchFn(benchfn) => {
                // Benchmarks aren't expected to panic, so we run them all in-process.
                crate::bench::benchmark(desc, monitor_ch, opts.nocapture, |harness| {
                    (benchfn.clone())(harness)
                });
            }
            DynTestFn(f) => {
                match strategy {
                    RunStrategy::InProcess => (),
                    _ => panic!("Cannot run dynamic test fn out-of-process"),
                };
                run_test_inner(
                    desc,
                    monitor_ch,
                    Box::new(move || __rust_begin_short_backtrace(f)),
                    test_run_opts,
                );
            }
            StaticTestFn(f) => run_test_inner(
                desc,
                monitor_ch,
                Box::new(move || __rust_begin_short_backtrace(f)),
                test_run_opts,
            ),
        }
    }

    /// Fixed frame used to clean the backtrace with `RUST_BACKTRACE=1`.
    #[inline(never)]
    fn __rust_begin_short_backtrace<F: FnOnce()>(f: F) {
        f()
    }

    fn run_test_in_process(
        desc: TestDesc,
        nocapture: bool,
        report_time: bool,
        testfn: Box<dyn FnOnce() + Send>,
        monitor_ch: Sender<CompletedTest>,
        time_opts: Option<time::TestTimeOptions>,
    ) {
        // Buffer for capturing standard I/O
        let data = Arc::new(Mutex::new(Vec::new()));

        let oldio = if !nocapture {
            Some((
                io::set_print(Some(Sink::new_boxed(&data))),
                io::set_panic(Some(Sink::new_boxed(&data))),
            ))
        } else {
            None
        };

        let start = report_time.then(Instant::now);
        let result = catch_unwind(AssertUnwindSafe(testfn));
        let exec_time = start.map(|start| {
            let duration = start.elapsed();
            TestExecTime(duration)
        });

        if let Some((printio, panicio)) = oldio {
            io::set_print(printio);
            io::set_panic(panicio);
        }

        let test_result = match result {
            Ok(()) => calc_result(&desc, Ok(()), &time_opts, &exec_time),
            Err(e) => calc_result(&desc, Err(e.as_ref()), &time_opts, &exec_time),
        };
        let stdout = data.lock().unwrap().to_vec();
        let message = CompletedTest::new(desc.clone(), test_result, exec_time, stdout);
        monitor_ch.send(message).unwrap();
    }

    fn spawn_test_subprocess(
        desc: TestDesc,
        report_time: bool,
        monitor_ch: Sender<CompletedTest>,
        time_opts: Option<time::TestTimeOptions>,
    ) {
        let (result, test_output, exec_time) = (|| {
            let args = env::args().collect::<Vec<_>>();
            let current_exe = &args[0];

            let start = report_time.then(Instant::now);
            let output = match Command::new(current_exe)
                .env(SECONDARY_TEST_INVOKER_VAR, desc.name.as_slice())
                .output() {
                    Ok(out) => out,
                    Err(e) => {
                        let err = format!("Failed to spawn {} as child for test: {:?}", args[0], e);
                        return (TrFailed, err.into_bytes(), None);
                    }
                };
            let exec_time = start.map(|start| {
                let duration = start.elapsed();
                TestExecTime(duration)
            });

            let std::process::Output { stdout, stderr, status } = output;
            let mut test_output = stdout;
            formatters::write_stderr_delimiter(&mut test_output, &desc.name);
            test_output.extend_from_slice(&stderr);

            let result = match (|| -> Result<TestResult, String> {
                let exit_code = get_exit_code(status)?;
                Ok(get_result_from_exit_code(&desc, exit_code, &time_opts, &exec_time))
            })() {
                Ok(r) => r,
                Err(e) => {
                    write!(&mut test_output, "Unexpected error: {}", e).unwrap();
                    TrFailed
                }
            };

            (result, test_output, exec_time)
        })();

        let message = CompletedTest::new(desc.clone(), result, exec_time, test_output);
        monitor_ch.send(message).unwrap();
    }

    fn run_test_in_spawned_subprocess(
        desc: TestDesc,
        testfn: Box<dyn FnOnce() + Send>,
    ) -> ! {
        let builtin_panic_hook = panic::take_hook();
        let record_result = Arc::new(move |panic_info: Option<&'_ PanicInfo<'_>>| {
            let test_result = match panic_info {
                Some(info) => calc_result(&desc, Err(info.payload()), &None, &None),
                None => calc_result(&desc, Ok(()), &None, &None),
            };

            // We don't support serializing TrFailedMsg, so just
            // print the message out to stderr.
            if let TrFailedMsg(msg) = &test_result {
                eprintln!("{}", msg);
            }

            if let Some(info) = panic_info {
                builtin_panic_hook(info);
            }

            if let TrOk = test_result {
                process::exit(test_result::TR_OK);
            } else {
                process::exit(test_result::TR_FAILED);
            }
        });
        let record_result2 = record_result.clone();
        panic::set_hook(Box::new(move |info| record_result2(Some(&info))));
        testfn();
        record_result(None);
        unreachable!("panic=abort callback should have exited the process")
    }