├── .github └── workflows │ └── ci.yaml ├── .gitignore ├── Cargo.toml ├── LICENSE-APACHE ├── LICENSE-MIT ├── README.md ├── src └── lib.rs ├── tests └── smoke.rs └── xtask ├── Cargo.toml └── src ├── main.rs └── tidy.rs /.github/workflows/ci.yaml: -------------------------------------------------------------------------------- 1 | name: CI 2 | on: 3 | pull_request: 4 | push: 5 | branches: ["master"] 6 | 7 | env: 8 | CARGO_INCREMENTAL: 0 9 | CARGO_NET_RETRY: 10 10 | CI: 1 11 | RUST_BACKTRACE: short 12 | RUSTFLAGS: -D warnings 13 | RUSTUP_MAX_RETRIES: 10 14 | 15 | jobs: 16 | test: 17 | name: Rust 18 | runs-on: ubuntu-latest 19 | 20 | steps: 21 | - uses: actions/checkout@v2 22 | with: 23 | fetch-depth: 0 # fetch tags for publish 24 | - run: rustup default 1.63 25 | - run: cargo run -p xtask 26 | env: 27 | CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }} 28 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | /ci 3 | Cargo.lock 4 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "cov-mark" 3 | version = "2.0.0" 4 | description = "Manual coverage marks." 5 | keywords = ["coverage", "test"] 6 | categories = ["development-tools"] 7 | license = "MIT OR Apache-2.0" 8 | repository = "https://github.com/matklad/cov-mark" 9 | documentation = "https://docs.rs/cov-mark" 10 | authors = [ 11 | "Aleksey Kladov ", 12 | "Simonas Kazlauskas " 13 | ] 14 | edition = "2021" 15 | rust-version = "1.63" 16 | 17 | exclude = [".github/", "bors.toml", "rustfmt.toml"] 18 | 19 | [workspace] 20 | members = ["xtask"] 21 | 22 | [features] 23 | default = ["enable"] 24 | enable = [] 25 | 26 | [package.metadata.docs.rs] 27 | all-features = true 28 | rustdoc-args = ["--cfg", "nightly_docs"] 29 | -------------------------------------------------------------------------------- /LICENSE-APACHE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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IN NO EVENT 19 | SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 20 | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR 22 | IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | DEALINGS IN THE SOFTWARE. 24 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # cov-mark 2 | 3 | Verify that your tests exercise the conditions you think they are exercising 4 | 5 | ```rust 6 | fn safe_divide(dividend: u32, divisor: u32) -> u32 { 7 | if divisor == 0 { 8 | cov_mark::hit!(save_divide_zero); 9 | return 0; 10 | } 11 | dividend / divisor 12 | } 13 | 14 | #[test] 15 | fn test_safe_divide_by_zero() { 16 | cov_mark::check!(save_divide_zero); 17 | assert_eq!(safe_divide(92, 0), 0); 18 | } 19 | ``` 20 | 21 | See [the docs](https://docs.rs/cov-mark) for details 22 | -------------------------------------------------------------------------------- /src/lib.rs: -------------------------------------------------------------------------------- 1 | //! # cov-mark 2 | //! 3 | //! This library at its core provides two macros, [`hit!`] and [`check!`], 4 | //! which can be used to verify that a certain test exercises a certain code 5 | //! path. 6 | //! 7 | //! Here's a short example: 8 | //! 9 | //! ``` 10 | //! fn parse_date(s: &str) -> Option<(u32, u32, u32)> { 11 | //! if 10 != s.len() { 12 | //! // By using `cov_mark::hit!` 13 | //! // we signal which test exercises this code. 14 | //! cov_mark::hit!(short_date); 15 | //! return None; 16 | //! } 17 | //! 18 | //! if "-" != &s[4..5] || "-" != &s[7..8] { 19 | //! cov_mark::hit!(bad_dashes); 20 | //! return None; 21 | //! } 22 | //! // ... 23 | //! # unimplemented!() 24 | //! } 25 | //! 26 | //! #[test] 27 | //! fn test_parse_date() { 28 | //! { 29 | //! // `cov_mark::check!` creates a guard object 30 | //! // that verifies that by the end of the scope we've 31 | //! // executed the corresponding `cov_mark::hit`. 32 | //! cov_mark::check!(short_date); 33 | //! assert!(parse_date("92").is_none()); 34 | //! } 35 | //! 36 | //! // This will fail. Although the test looks like 37 | //! // it exercises the second condition, it does not. 38 | //! // The call to `check!` call catches this bug in the test. 39 | //! // { 40 | //! // cov_mark::check!(bad_dashes); 41 | //! // assert!(parse_date("27.2.2013").is_none()); 42 | //! // } 43 | //! 44 | //! { 45 | //! cov_mark::check!(bad_dashes); 46 | //! assert!(parse_date("27.02.2013").is_none()); 47 | //! } 48 | //! } 49 | //! 50 | //! # fn main() {} 51 | //! ``` 52 | //! 53 | //! Here's why coverage marks are useful: 54 | //! 55 | //! * Verifying that something doesn't happen for the *right* reason. 56 | //! * Finding the test that exercises the code (grep for `check!(mark_name)`). 57 | //! * Finding the code that the test is supposed to check (grep for `hit!(mark_name)`). 58 | //! * Making sure that code and tests don't diverge during refactorings. 59 | //! * (If used pervasively) Verifying that each branch has a corresponding test. 60 | //! 61 | //! # Limitations 62 | //! 63 | //! * Names of marks must be globally unique. 64 | //! 65 | //! # Implementation Details 66 | //! 67 | //! Each coverage mark is an `AtomicUsize` counter. [`hit!`] increments 68 | //! this counter, [`check!`] returns a guard object which checks that 69 | //! the mark was incremented. 70 | //! Each counter is stored as a thread-local, allowing for accurate per-thread 71 | //! counting. 72 | 73 | #![cfg_attr(nightly_docs, deny(broken_intra_doc_links))] 74 | #![cfg_attr(nightly_docs, feature(doc_cfg))] 75 | 76 | /// Hit a mark with a specified name. 77 | /// 78 | /// # Example 79 | /// 80 | /// ``` 81 | /// fn safe_divide(dividend: u32, divisor: u32) -> u32 { 82 | /// if divisor == 0 { 83 | /// cov_mark::hit!(save_divide_zero); 84 | /// return 0; 85 | /// } 86 | /// dividend / divisor 87 | /// } 88 | /// ``` 89 | #[macro_export] 90 | macro_rules! hit { 91 | ($ident:ident) => { 92 | $crate::__rt::hit(stringify!($ident)) 93 | }; 94 | } 95 | 96 | /// Checks that a specified mark was hit. 97 | /// 98 | /// # Example 99 | /// 100 | /// ``` 101 | /// #[test] 102 | /// fn test_safe_divide_by_zero() { 103 | /// cov_mark::check!(save_divide_zero); 104 | /// assert_eq!(safe_divide(92, 0), 0); 105 | /// } 106 | /// # fn safe_divide(dividend: u32, divisor: u32) -> u32 { 107 | /// # if divisor == 0 { 108 | /// # cov_mark::hit!(save_divide_zero); 109 | /// # return 0; 110 | /// # } 111 | /// # dividend / divisor 112 | /// # } 113 | /// ``` 114 | #[macro_export] 115 | macro_rules! check { 116 | ($ident:ident) => { 117 | let _guard = $crate::__rt::Guard::new(stringify!($ident), None); 118 | }; 119 | } 120 | 121 | /// Checks that a specified mark was hit exactly the specified number of times. 122 | /// 123 | /// # Example 124 | /// 125 | /// ``` 126 | /// struct CoveredDropper; 127 | /// impl Drop for CoveredDropper { 128 | /// fn drop(&mut self) { 129 | /// cov_mark::hit!(covered_dropper_drops); 130 | /// } 131 | /// } 132 | /// 133 | /// #[test] 134 | /// fn drop_count_test() { 135 | /// cov_mark::check_count!(covered_dropper_drops, 2); 136 | /// let _covered_dropper1 = CoveredDropper; 137 | /// let _covered_dropper2 = CoveredDropper; 138 | /// } 139 | /// ``` 140 | #[macro_export] 141 | macro_rules! check_count { 142 | ($ident:ident, $count: literal) => { 143 | let _guard = $crate::__rt::Guard::new(stringify!($ident), Some($count)); 144 | }; 145 | } 146 | 147 | #[doc(hidden)] 148 | #[cfg(feature = "enable")] 149 | pub mod __rt { 150 | use std::{ 151 | cell::{Cell, RefCell}, 152 | rc::Rc, 153 | sync::atomic::{AtomicUsize, Ordering::Relaxed}, 154 | }; 155 | 156 | /// Even with 157 | /// https://github.com/rust-lang/rust/commit/641d3b09f41b441f2c2618de32983ad3d13ea3f8, 158 | /// a `thread_local` generates significantly more verbose assembly on x86 159 | /// than atomic, so we'll use atomic for the fast path 160 | static LEVEL: AtomicUsize = AtomicUsize::new(0); 161 | 162 | thread_local! { 163 | static ACTIVE: RefCell>> = Default::default(); 164 | } 165 | 166 | #[inline(always)] 167 | pub fn hit(key: &'static str) { 168 | if LEVEL.load(Relaxed) > 0 { 169 | hit_cold(key); 170 | } 171 | 172 | #[cold] 173 | fn hit_cold(key: &'static str) { 174 | ACTIVE.with(|it| it.borrow().iter().for_each(|g| g.hit(key))) 175 | } 176 | } 177 | 178 | struct GuardInner { 179 | mark: &'static str, 180 | hits: Cell, 181 | expected_hits: Option, 182 | } 183 | 184 | pub struct Guard { 185 | inner: Rc, 186 | } 187 | 188 | impl GuardInner { 189 | fn hit(&self, key: &'static str) { 190 | if key == self.mark { 191 | self.hits.set(self.hits.get().saturating_add(1)) 192 | } 193 | } 194 | } 195 | 196 | impl Guard { 197 | pub fn new(mark: &'static str, expected_hits: Option) -> Guard { 198 | let inner = GuardInner { 199 | mark, 200 | hits: Cell::new(0), 201 | expected_hits, 202 | }; 203 | let inner = Rc::new(inner); 204 | LEVEL.fetch_add(1, Relaxed); 205 | ACTIVE.with(|it| it.borrow_mut().push(Rc::clone(&inner))); 206 | Guard { inner } 207 | } 208 | } 209 | 210 | impl Drop for Guard { 211 | fn drop(&mut self) { 212 | LEVEL.fetch_sub(1, Relaxed); 213 | let last = ACTIVE.with(|it| it.borrow_mut().pop()); 214 | 215 | if std::thread::panicking() { 216 | return; 217 | } 218 | 219 | let last = last.unwrap(); 220 | assert!(Rc::ptr_eq(&last, &self.inner)); 221 | let hit_count = last.hits.get(); 222 | match last.expected_hits { 223 | Some(hits) => assert!( 224 | hit_count == hits, 225 | "mark was hit {} times, expected {}", 226 | hit_count, 227 | hits 228 | ), 229 | None => assert!(hit_count > 0, "mark was not hit"), 230 | } 231 | } 232 | } 233 | } 234 | 235 | #[doc(hidden)] 236 | #[cfg(not(feature = "enable"))] 237 | pub mod __rt { 238 | #[inline(always)] 239 | pub fn hit(_: &'static str) {} 240 | 241 | #[non_exhaustive] 242 | pub struct Guard; 243 | 244 | impl Guard { 245 | pub fn new(_: &'static str, _: Option) -> Guard { 246 | Guard 247 | } 248 | } 249 | } 250 | -------------------------------------------------------------------------------- /tests/smoke.rs: -------------------------------------------------------------------------------- 1 | fn safe_divide(dividend: u32, divisor: u32) -> u32 { 2 | if divisor == 0 { 3 | cov_mark::hit!(save_divide_zero); 4 | return 0; 5 | } 6 | dividend / divisor 7 | } 8 | 9 | #[test] 10 | fn test_safe_divide_by_zero() { 11 | cov_mark::check!(save_divide_zero); 12 | assert_eq!(safe_divide(92, 0), 0); 13 | } 14 | 15 | struct CoveredDropper; 16 | impl Drop for CoveredDropper { 17 | fn drop(&mut self) { 18 | cov_mark::hit!(covered_dropper_drops); 19 | } 20 | } 21 | 22 | #[test] 23 | fn test_drop_count() { 24 | cov_mark::check_count!(covered_dropper_drops, 2); 25 | let _covered_dropper1 = CoveredDropper; 26 | let _covered_dropper2 = CoveredDropper; 27 | } 28 | -------------------------------------------------------------------------------- /xtask/Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "xtask" 3 | version = "0.0.0" 4 | publish = false 5 | authors = ["Aleksey Kladov "] 6 | edition = "2018" 7 | 8 | [dependencies] 9 | xshell = "0.2.6" 10 | -------------------------------------------------------------------------------- /xtask/src/main.rs: -------------------------------------------------------------------------------- 1 | #[cfg(test)] 2 | mod tidy; 3 | 4 | use std::time::Instant; 5 | 6 | use xshell::{cmd, Shell}; 7 | 8 | fn main() -> xshell::Result<()> { 9 | let sh = Shell::new()?; 10 | 11 | cmd!(sh, "rustup toolchain install stable --no-self-update").run()?; 12 | let _e = sh.push_env("RUSTUP_TOOLCHAIN", "stable"); 13 | cmd!(sh, "rustc --version").run()?; 14 | 15 | { 16 | let _s = section("BUILD"); 17 | cmd!(sh, "cargo test --workspace --no-run").run()?; 18 | } 19 | 20 | { 21 | let _s = section("TEST"); 22 | cmd!(sh, "cargo test --workspace -- --nocapture").run()?; 23 | } 24 | 25 | { 26 | let _s = section("PUBLISH"); 27 | 28 | let version = cmd!(sh, "cargo pkgid -p cov-mark") 29 | .read()? 30 | .rsplit_once('#') 31 | .unwrap() 32 | .1 33 | .to_string(); 34 | let tag = format!("v{version}"); 35 | 36 | let current_branch = cmd!(sh, "git branch --show-current").read()?; 37 | let tag_exists = cmd!(sh, "git tag --list") 38 | .read()? 39 | .split_ascii_whitespace() 40 | .any(|it| it == &tag); 41 | 42 | if current_branch == "master" && !tag_exists { 43 | cmd!(sh, "git tag v{version}").run()?; 44 | cmd!(sh, "cargo publish -p cov-mark").run()?; 45 | cmd!(sh, "git push --tags").run()?; 46 | } 47 | } 48 | 49 | Ok(()) 50 | } 51 | 52 | fn section(name: &'static str) -> impl Drop { 53 | println!("::group::{name}"); 54 | let start = Instant::now(); 55 | defer(move || { 56 | let elapsed = start.elapsed(); 57 | eprintln!("{name}: {elapsed:.2?}"); 58 | println!("::endgroup::"); 59 | }) 60 | } 61 | 62 | fn defer(f: F) -> impl Drop { 63 | struct D(Option); 64 | impl Drop for D { 65 | fn drop(&mut self) { 66 | if let Some(f) = self.0.take() { 67 | f() 68 | } 69 | } 70 | } 71 | D(Some(f)) 72 | } 73 | -------------------------------------------------------------------------------- /xtask/src/tidy.rs: -------------------------------------------------------------------------------- 1 | use xshell::{cmd, Shell}; 2 | 3 | #[test] 4 | fn test_formatting() { 5 | let sh = Shell::new().unwrap(); 6 | cmd!(sh, "cargo fmt --all -- --check").run().unwrap() 7 | } 8 | --------------------------------------------------------------------------------