1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Code that generates a test runner to run all the tests in a crate
14 #![allow(unused_imports)]
16 use self::HasTestSignature::*;
22 use attr::{self, HasAttrs};
23 use syntax_pos::{self, DUMMY_SP, NO_EXPANSION, Span, FileMap, BytePos};
26 use codemap::{self, CodeMap, ExpnInfo, NameAndSpan, MacroAttribute, dummy_spanned};
28 use errors::snippet::{SnippetData};
30 use entry::{self, EntryPointType};
31 use ext::base::{ExtCtxt, Resolver};
32 use ext::build::AstBuilder;
33 use ext::expand::ExpansionConfig;
34 use ext::hygiene::{Mark, SyntaxContext};
36 use util::move_map::MoveMap;
38 use parse::{token, ParseSess};
40 use ast::{self, Ident};
42 use symbol::{self, Symbol, keywords};
43 use util::small_vector::SmallVector;
55 should_panic: ShouldPanic
60 span_diagnostic: &'a errors::Handler,
64 reexport_test_harness_main: Option<Symbol>,
68 // top-level re-export submodule, filled out after folding is finished
69 toplevel_reexport: Option<Ident>,
72 // Traverse the crate, collecting all the test functions, eliding any
73 // existing main functions, and synthesizing a main test harness
74 pub fn modify_for_testing(sess: &ParseSess,
75 resolver: &mut Resolver,
78 span_diagnostic: &errors::Handler) -> ast::Crate {
79 // Check for #[reexport_test_harness_main = "some_name"] which
80 // creates a `use some_name = __test::main;`. This needs to be
81 // unconditional, so that the attribute is still marked as used in
83 let reexport_test_harness_main =
84 attr::first_attr_value_str_by_name(&krate.attrs,
85 "reexport_test_harness_main");
88 generate_test_harness(sess, resolver, reexport_test_harness_main, krate, span_diagnostic)
94 struct TestHarnessGenerator<'a> {
98 // submodule name, gensym'd identifier for re-exports
99 tested_submods: Vec<(Ident, Ident)>,
102 impl<'a> fold::Folder for TestHarnessGenerator<'a> {
103 fn fold_crate(&mut self, c: ast::Crate) -> ast::Crate {
104 let mut folded = fold::noop_fold_crate(c, self);
106 // Add a special __test module to the crate that will contain code
107 // generated for the test harness
108 let (mod_, reexport) = mk_test_module(&mut self.cx);
110 Some(re) => folded.module.items.push(re),
113 folded.module.items.push(mod_);
117 fn fold_item(&mut self, i: P<ast::Item>) -> SmallVector<P<ast::Item>> {
119 if ident.name != keywords::Invalid.name() {
120 self.cx.path.push(ident);
122 debug!("current path: {}", path_name_i(&self.cx.path));
124 if is_test_fn(&self.cx, &i) || is_bench_fn(&self.cx, &i) {
126 ast::ItemKind::Fn(_, ast::Unsafety::Unsafe, _, _, _, _) => {
127 let diag = self.cx.span_diagnostic;
128 panic!(diag.span_fatal(i.span, "unsafe functions cannot be used for tests"));
131 debug!("this is a test function");
134 path: self.cx.path.clone(),
135 bench: is_bench_fn(&self.cx, &i),
136 ignore: is_ignored(&i),
137 should_panic: should_panic(&i, &self.cx)
139 self.cx.testfns.push(test);
140 self.tests.push(i.ident);
145 let mut item = i.unwrap();
146 // We don't want to recurse into anything other than mods, since
147 // mods or tests inside of functions will break things
148 if let ast::ItemKind::Mod(module) = item.node {
149 let tests = mem::replace(&mut self.tests, Vec::new());
150 let tested_submods = mem::replace(&mut self.tested_submods, Vec::new());
151 let mut mod_folded = fold::noop_fold_mod(module, self);
152 let tests = mem::replace(&mut self.tests, tests);
153 let tested_submods = mem::replace(&mut self.tested_submods, tested_submods);
155 if !tests.is_empty() || !tested_submods.is_empty() {
156 let (it, sym) = mk_reexport_mod(&mut self.cx, item.id, tests, tested_submods);
157 mod_folded.items.push(it);
159 if !self.cx.path.is_empty() {
160 self.tested_submods.push((self.cx.path[self.cx.path.len()-1], sym));
162 debug!("pushing nothing, sym: {:?}", sym);
163 self.cx.toplevel_reexport = Some(sym);
166 item.node = ast::ItemKind::Mod(mod_folded);
168 if ident.name != keywords::Invalid.name() {
171 SmallVector::one(P(item))
174 fn fold_mac(&mut self, mac: ast::Mac) -> ast::Mac { mac }
177 struct EntryPointCleaner {
178 // Current depth in the ast
182 impl fold::Folder for EntryPointCleaner {
183 fn fold_item(&mut self, i: P<ast::Item>) -> SmallVector<P<ast::Item>> {
185 let folded = fold::noop_fold_item(i, self).expect_one("noop did something");
188 // Remove any #[main] or #[start] from the AST so it doesn't
189 // clash with the one we're going to add, but mark it as
190 // #[allow(dead_code)] to avoid printing warnings.
191 let folded = match entry::entry_point_type(&folded, self.depth) {
192 EntryPointType::MainNamed |
193 EntryPointType::MainAttr |
194 EntryPointType::Start =>
195 folded.map(|ast::Item {id, ident, attrs, node, vis, span}| {
196 let allow_str = Symbol::intern("allow");
197 let dead_code_str = Symbol::intern("dead_code");
198 let word_vec = vec![attr::mk_list_word_item(dead_code_str)];
199 let allow_dead_code_item = attr::mk_list_item(allow_str, word_vec);
200 let allow_dead_code = attr::mk_attr_outer(DUMMY_SP,
202 allow_dead_code_item);
207 attrs: attrs.into_iter()
209 !attr.check_name("main") && !attr.check_name("start")
211 .chain(iter::once(allow_dead_code))
218 EntryPointType::None |
219 EntryPointType::OtherMain => folded,
222 SmallVector::one(folded)
225 fn fold_mac(&mut self, mac: ast::Mac) -> ast::Mac { mac }
228 fn mk_reexport_mod(cx: &mut TestCtxt,
231 tested_submods: Vec<(Ident, Ident)>)
232 -> (P<ast::Item>, Ident) {
233 let super_ = Ident::from_str("super");
235 // Generate imports with `#[allow(private_in_public)]` to work around issue #36768.
236 let allow_private_in_public = cx.ext_cx.attribute(DUMMY_SP, cx.ext_cx.meta_list(
238 Symbol::intern("allow"),
239 vec![cx.ext_cx.meta_list_item_word(DUMMY_SP, Symbol::intern("private_in_public"))],
241 let items = tests.into_iter().map(|r| {
242 cx.ext_cx.item_use_simple(DUMMY_SP, ast::Visibility::Public,
243 cx.ext_cx.path(DUMMY_SP, vec![super_, r]))
244 .map_attrs(|_| vec![allow_private_in_public.clone()])
245 }).chain(tested_submods.into_iter().map(|(r, sym)| {
246 let path = cx.ext_cx.path(DUMMY_SP, vec![super_, r, sym]);
247 cx.ext_cx.item_use_simple_(DUMMY_SP, ast::Visibility::Public, r, path)
248 .map_attrs(|_| vec![allow_private_in_public.clone()])
251 let reexport_mod = ast::Mod {
256 let sym = Ident::with_empty_ctxt(Symbol::gensym("__test_reexports"));
257 let parent = if parent == ast::DUMMY_NODE_ID { ast::CRATE_NODE_ID } else { parent };
258 cx.ext_cx.current_expansion.mark = cx.ext_cx.resolver.get_module_scope(parent);
259 let it = cx.ext_cx.monotonic_expander().fold_item(P(ast::Item {
262 id: ast::DUMMY_NODE_ID,
263 node: ast::ItemKind::Mod(reexport_mod),
264 vis: ast::Visibility::Public,
271 fn generate_test_harness(sess: &ParseSess,
272 resolver: &mut Resolver,
273 reexport_test_harness_main: Option<Symbol>,
275 sd: &errors::Handler) -> ast::Crate {
276 // Remove the entry points
277 let mut cleaner = EntryPointCleaner { depth: 0 };
278 let krate = cleaner.fold_crate(krate);
280 let mark = Mark::fresh();
281 let mut cx: TestCtxt = TestCtxt {
284 ext_cx: ExtCtxt::new(sess, ExpansionConfig::default("test".to_string()), resolver),
287 reexport_test_harness_main: reexport_test_harness_main,
288 is_test_crate: is_test_crate(&krate),
289 toplevel_reexport: None,
290 ctxt: SyntaxContext::empty().apply_mark(mark),
292 cx.ext_cx.crate_root = Some("std");
294 mark.set_expn_info(ExpnInfo {
296 callee: NameAndSpan {
297 format: MacroAttribute(Symbol::intern("test")),
299 allow_internal_unstable: true,
303 TestHarnessGenerator {
306 tested_submods: Vec::new(),
310 /// Craft a span that will be ignored by the stability lint's
311 /// call to codemap's is_internal check.
312 /// The expanded code calls some unstable functions in the test crate.
313 fn ignored_span(cx: &TestCtxt, sp: Span) -> Span {
314 Span { ctxt: cx.ctxt, ..sp }
318 enum HasTestSignature {
324 fn is_test_fn(cx: &TestCtxt, i: &ast::Item) -> bool {
325 let has_test_attr = attr::contains_name(&i.attrs, "test");
327 fn has_test_signature(i: &ast::Item) -> HasTestSignature {
329 ast::ItemKind::Fn(ref decl, _, _, _, ref generics, _) => {
330 let no_output = match decl.output {
331 ast::FunctionRetTy::Default(..) => true,
332 ast::FunctionRetTy::Ty(ref t) if t.node == ast::TyKind::Tup(vec![]) => true,
335 if decl.inputs.is_empty()
337 && !generics.is_parameterized() {
343 _ => NotEvenAFunction,
348 let diag = cx.span_diagnostic;
349 match has_test_signature(i) {
351 No => diag.span_err(i.span, "functions used as tests must have signature fn() -> ()"),
352 NotEvenAFunction => diag.span_err(i.span,
353 "only functions may be used as tests"),
357 return has_test_attr && has_test_signature(i) == Yes;
360 fn is_bench_fn(cx: &TestCtxt, i: &ast::Item) -> bool {
361 let has_bench_attr = attr::contains_name(&i.attrs, "bench");
363 fn has_test_signature(i: &ast::Item) -> bool {
365 ast::ItemKind::Fn(ref decl, _, _, _, ref generics, _) => {
366 let input_cnt = decl.inputs.len();
367 let no_output = match decl.output {
368 ast::FunctionRetTy::Default(..) => true,
369 ast::FunctionRetTy::Ty(ref t) if t.node == ast::TyKind::Tup(vec![]) => true,
372 let tparm_cnt = generics.ty_params.len();
373 // NB: inadequate check, but we're running
374 // well before resolve, can't get too deep.
376 && no_output && tparm_cnt == 0
382 if has_bench_attr && !has_test_signature(i) {
383 let diag = cx.span_diagnostic;
384 diag.span_err(i.span, "functions used as benches must have signature \
385 `fn(&mut Bencher) -> ()`");
388 return has_bench_attr && has_test_signature(i);
391 fn is_ignored(i: &ast::Item) -> bool {
392 i.attrs.iter().any(|attr| attr.check_name("ignore"))
395 fn should_panic(i: &ast::Item, cx: &TestCtxt) -> ShouldPanic {
396 match i.attrs.iter().find(|attr| attr.check_name("should_panic")) {
398 let sd = cx.span_diagnostic;
399 if attr.is_value_str() {
402 "attribute must be of the form: \
403 `#[should_panic]` or \
404 `#[should_panic(expected = \"error message\")]`"
405 ).note("Errors in this attribute were erroneously allowed \
406 and will become a hard error in a future release.")
408 return ShouldPanic::Yes(None);
410 match attr.meta_item_list() {
411 // Handle #[should_panic]
412 None => ShouldPanic::Yes(None),
413 // Handle #[should_panic(expected = "foo")]
415 let msg = list.iter()
416 .find(|mi| mi.check_name("expected"))
417 .and_then(|mi| mi.meta_item())
418 .and_then(|mi| mi.value_str());
419 if list.len() != 1 || msg.is_none() {
422 "argument must be of the form: \
423 `expected = \"error message\"`"
424 ).note("Errors in this attribute were erroneously \
425 allowed and will become a hard error in a \
426 future release.").emit();
427 ShouldPanic::Yes(None)
429 ShouldPanic::Yes(msg)
434 None => ShouldPanic::No,
440 We're going to be building a module that looks more or less like:
443 extern crate test (name = "test", vers = "...");
445 test::test_main_static(&::os::args()[], tests, test::Options::new())
448 static tests : &'static [test::TestDescAndFn] = &[
449 ... the list of tests in the crate ...
455 fn mk_std(cx: &TestCtxt) -> P<ast::Item> {
456 let id_test = Ident::from_str("test");
457 let sp = ignored_span(cx, DUMMY_SP);
458 let (vi, vis, ident) = if cx.is_test_crate {
460 P(nospan(ast::ViewPathSimple(id_test,
461 path_node(vec![id_test]))))),
462 ast::Visibility::Public, keywords::Invalid.ident())
464 (ast::ItemKind::ExternCrate(None), ast::Visibility::Inherited, id_test)
467 id: ast::DUMMY_NODE_ID,
476 fn mk_main(cx: &mut TestCtxt) -> P<ast::Item> {
477 // Writing this out by hand with 'ignored_span':
480 // use std::slice::AsSlice;
481 // test::test_main_static(::std::os::args().as_slice(), TESTS, test::Options::new());
484 let sp = ignored_span(cx, DUMMY_SP);
485 let ecx = &cx.ext_cx;
487 // test::test_main_static
489 ecx.path(sp, vec![Ident::from_str("test"), Ident::from_str("test_main_static")]);
491 // test::test_main_static(...)
492 let test_main_path_expr = ecx.expr_path(test_main_path);
493 let tests_ident_expr = ecx.expr_ident(sp, Ident::from_str("TESTS"));
494 let call_test_main = ecx.expr_call(sp, test_main_path_expr,
495 vec![tests_ident_expr]);
496 let call_test_main = ecx.stmt_expr(call_test_main);
498 let main_meta = ecx.meta_word(sp, Symbol::intern("main"));
499 let main_attr = ecx.attribute(sp, main_meta);
500 // pub fn main() { ... }
501 let main_ret_ty = ecx.ty(sp, ast::TyKind::Tup(vec![]));
502 let main_body = ecx.block(sp, vec![call_test_main]);
503 let main = ast::ItemKind::Fn(ecx.fn_decl(vec![], main_ret_ty),
504 ast::Unsafety::Normal,
505 dummy_spanned(ast::Constness::NotConst),
506 ::abi::Abi::Rust, ast::Generics::default(), main_body);
507 let main = P(ast::Item {
508 ident: Ident::from_str("main"),
509 attrs: vec![main_attr],
510 id: ast::DUMMY_NODE_ID,
512 vis: ast::Visibility::Public,
519 fn mk_test_module(cx: &mut TestCtxt) -> (P<ast::Item>, Option<P<ast::Item>>) {
520 // Link to test crate
521 let import = mk_std(cx);
523 // A constant vector of test descriptors.
524 let tests = mk_tests(cx);
526 // The synthesized main function which will call the console test runner
527 // with our list of tests
528 let mainfn = mk_main(cx);
530 let testmod = ast::Mod {
532 items: vec![import, mainfn, tests],
534 let item_ = ast::ItemKind::Mod(testmod);
535 let mod_ident = Ident::with_empty_ctxt(Symbol::gensym("__test"));
537 let mut expander = cx.ext_cx.monotonic_expander();
538 let item = expander.fold_item(P(ast::Item {
539 id: ast::DUMMY_NODE_ID,
543 vis: ast::Visibility::Public,
546 let reexport = cx.reexport_test_harness_main.map(|s| {
547 // building `use <ident> = __test::main`
548 let reexport_ident = Ident::with_empty_ctxt(s);
551 nospan(ast::ViewPathSimple(reexport_ident,
552 path_node(vec![mod_ident, Ident::from_str("main")])));
554 expander.fold_item(P(ast::Item {
555 id: ast::DUMMY_NODE_ID,
556 ident: keywords::Invalid.ident(),
558 node: ast::ItemKind::Use(P(use_path)),
559 vis: ast::Visibility::Inherited,
564 debug!("Synthetic test module:\n{}\n", pprust::item_to_string(&item));
569 fn nospan<T>(t: T) -> codemap::Spanned<T> {
570 codemap::Spanned { node: t, span: DUMMY_SP }
573 fn path_node(ids: Vec<Ident>) -> ast::Path {
576 segments: ids.into_iter().map(|id| ast::PathSegment::from_ident(id, DUMMY_SP)).collect(),
580 fn path_name_i(idents: &[Ident]) -> String {
581 // FIXME: Bad copies (#2543 -- same for everything else that says "bad")
582 idents.iter().map(|i| i.to_string()).collect::<Vec<String>>().join("::")
585 fn mk_tests(cx: &TestCtxt) -> P<ast::Item> {
586 // The vector of test_descs for this crate
587 let test_descs = mk_test_descs(cx);
589 // FIXME #15962: should be using quote_item, but that stringifies
590 // __test_reexports, causing it to be reinterned, losing the
591 // gensym information.
592 let sp = ignored_span(cx, DUMMY_SP);
593 let ecx = &cx.ext_cx;
594 let struct_type = ecx.ty_path(ecx.path(sp, vec![ecx.ident_of("self"),
595 ecx.ident_of("test"),
596 ecx.ident_of("TestDescAndFn")]));
597 let static_lt = ecx.lifetime(sp, keywords::StaticLifetime.name());
598 // &'static [self::test::TestDescAndFn]
599 let static_type = ecx.ty_rptr(sp,
600 ecx.ty(sp, ast::TyKind::Slice(struct_type)),
602 ast::Mutability::Immutable);
603 // static TESTS: $static_type = &[...];
605 ecx.ident_of("TESTS"),
610 fn is_test_crate(krate: &ast::Crate) -> bool {
611 match attr::find_crate_name(&krate.attrs) {
612 Some(s) if "test" == s.as_str() => true,
617 fn mk_test_descs(cx: &TestCtxt) -> P<ast::Expr> {
618 debug!("building test vector from {} tests", cx.testfns.len());
621 id: ast::DUMMY_NODE_ID,
622 node: ast::ExprKind::AddrOf(ast::Mutability::Immutable,
624 id: ast::DUMMY_NODE_ID,
625 node: ast::ExprKind::Array(cx.testfns.iter().map(|test| {
626 mk_test_desc_and_fn_rec(cx, test)
629 attrs: ast::ThinVec::new(),
632 attrs: ast::ThinVec::new(),
636 fn mk_test_desc_and_fn_rec(cx: &TestCtxt, test: &Test) -> P<ast::Expr> {
637 // FIXME #15962: should be using quote_expr, but that stringifies
638 // __test_reexports, causing it to be reinterned, losing the
639 // gensym information.
641 let span = ignored_span(cx, test.span);
642 let path = test.path.clone();
643 let ecx = &cx.ext_cx;
644 let self_id = ecx.ident_of("self");
645 let test_id = ecx.ident_of("test");
647 // creates self::test::$name
648 let test_path = |name| {
649 ecx.path(span, vec![self_id, test_id, ecx.ident_of(name)])
651 // creates $name: $expr
652 let field = |name, expr| ecx.field_imm(span, ecx.ident_of(name), expr);
654 debug!("encoding {}", path_name_i(&path[..]));
656 // path to the #[test] function: "foo::bar::baz"
657 let path_string = path_name_i(&path[..]);
658 let name_expr = ecx.expr_str(span, Symbol::intern(&path_string));
660 // self::test::StaticTestName($name_expr)
661 let name_expr = ecx.expr_call(span,
662 ecx.expr_path(test_path("StaticTestName")),
665 let ignore_expr = ecx.expr_bool(span, test.ignore);
666 let should_panic_path = |name| {
667 ecx.path(span, vec![self_id, test_id, ecx.ident_of("ShouldPanic"), ecx.ident_of(name)])
669 let fail_expr = match test.should_panic {
670 ShouldPanic::No => ecx.expr_path(should_panic_path("No")),
671 ShouldPanic::Yes(msg) => {
674 let msg = ecx.expr_str(span, msg);
675 let path = should_panic_path("YesWithMessage");
676 ecx.expr_call(span, ecx.expr_path(path), vec![msg])
678 None => ecx.expr_path(should_panic_path("Yes")),
683 // self::test::TestDesc { ... }
684 let desc_expr = ecx.expr_struct(
686 test_path("TestDesc"),
687 vec![field("name", name_expr),
688 field("ignore", ignore_expr),
689 field("should_panic", fail_expr)]);
692 let mut visible_path = match cx.toplevel_reexport {
693 Some(id) => vec![id],
695 let diag = cx.span_diagnostic;
696 diag.bug("expected to find top-level re-export name, but found None");
699 visible_path.extend(path);
701 let fn_expr = ecx.expr_path(ecx.path_global(span, visible_path));
703 let variant_name = if test.bench { "StaticBenchFn" } else { "StaticTestFn" };
704 // self::test::$variant_name($fn_expr)
705 let testfn_expr = ecx.expr_call(span, ecx.expr_path(test_path(variant_name)), vec![fn_expr]);
707 // self::test::TestDescAndFn { ... }
708 ecx.expr_struct(span,
709 test_path("TestDescAndFn"),
710 vec![field("desc", desc_expr),
711 field("testfn", testfn_expr)])