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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 librustc_ast 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.
+#![cfg_attr(feature = "asm_black_box", feature(test))]
+#![cfg_attr(feature = "capture", feature(internal_output_capture))]
+
+// Public reexports
+pub use self::bench::{black_box, Bencher};
+pub use self::console::run_tests_console;
+pub use self::options::{ColorConfig, Options, OutputFormat, RunIgnored, ShouldPanic};
+pub use self::types::TestName::*;
+pub use self::types::*;
+pub use self::ColorConfig::*;
+pub use cli::TestOpts;
+
+// Module to be used by rustc to compile tests in libtest
+pub mod test {
+ pub use crate::{
+ assert_test_result,
+ bench::Bencher,
+ cli::{parse_opts, TestOpts},
+ filter_tests,
+ helpers::metrics::{Metric, MetricMap},
+ options::{Options, RunIgnored, RunStrategy, ShouldPanic},
+ run_test, test_main, test_main_static,
+ test_result::{TestResult, TrFailed, TrFailedMsg, TrIgnored, TrOk},
+ time::{TestExecTime, TestTimeOptions},
+ types::{
+ DynTestFn, DynTestName, StaticBenchFn, StaticTestFn, StaticTestName, TestDesc,
+ TestDescAndFn, TestName, TestType,
+ },
+ };
+}
+
+use std::{
+ env, io,
+ io::prelude::Write,
+ panic::{self, catch_unwind, AssertUnwindSafe, PanicInfo},
+ process::{self, Command},
+ sync::mpsc::{channel, Sender},
+ sync::{Arc, Mutex},
+ thread,
+ time::{Duration, Instant},
+};
+
+pub mod bench;
+mod cli;
+mod console;
+mod event;
+mod formatters;
+mod helpers;
+mod options;
+pub mod stats;
+mod test_result;
+mod time;
+mod types;
+
+#[cfg(test)]
+mod tests;
+
+use event::{CompletedTest, TestEvent};
+use helpers::concurrency::get_concurrency;
+use helpers::exit_code::get_exit_code;
+use options::{Concurrent, RunStrategy};
+use test_result::*;
+use time::TestExecTime;
+
+// Process exit code to be used to indicate test failures.
+const ERROR_EXIT_CODE: i32 = 101;
+
+const SECONDARY_TEST_INVOKER_VAR: &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) {
+ env::remove_var(SECONDARY_TEST_INVOKER_VAR);
+ let test = tests
+ .iter()
+ .filter(|test| test.desc.name.as_slice() == name)
+ .map(make_owned_test)
+ .next()
+ .unwrap_or_else(|| panic!("couldn't find a test with the provided name '{}'", 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 trait Termination {
+ fn report(self) -> i32;
+}
+
+impl Termination for () {
+ fn report(self) -> i32 {
+ 0
+ }
+}
+
+/// 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| matches!(e.testfn, StaticTestFn(_) | DynTestFn(_)));
+
+ 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 !opts.filters.is_empty() {
+ filtered.retain(|test| opts.filters.iter().any(|filter| 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.nocapture,
+ 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, benchfn);
+ }
+ 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();
+
+ // prevent this frame from being tail-call optimised away
+ black_box(());
+}
+
+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()));
+
+ if !nocapture {
+ #[cfg(feature = "capture")]
+ io::set_output_capture(Some(data.clone()));
+ }
+
+ let start = if report_time { Some(Instant::now()) } else { None };
+ let result = catch_unwind(AssertUnwindSafe(testfn));
+ let exec_time = start.map(|start| {
+ let duration = start.elapsed();
+ TestExecTime(duration)
+ });
+
+ #[cfg(feature = "capture")]
+ io::set_output_capture(None);
+
+ 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_or_else(|e| e.into_inner()).to_vec();
+ let message = CompletedTest::new(desc, test_result, exec_time, stdout);
+ monitor_ch.send(message).unwrap();
+}
+
+fn spawn_test_subprocess(
+ desc: TestDesc,
+ nocapture: bool,
+ 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 mut command = Command::new(current_exe);
+ command.env(SECONDARY_TEST_INVOKER_VAR, desc.name.as_slice());
+ if nocapture {
+ command.stdout(process::Stdio::inherit());
+ command.stderr(process::Stdio::inherit());
+ }
+
+ let start = if report_time { Some(Instant::now()) } else { None };
+ let output = match command.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, 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")
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 00:30:54 +0000