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|
//! This module implements manually tracked test coverage, which useful for
//! quickly finding a test responsible for testing a particular bit of code.
//!
//! See https://matklad.github.io/2018/06/18/a-trick-for-test-maintenance.html
//! for details, but the TL;DR is that you write your test as
//!
//! ```no-run
//! #[test]
//! fn test_foo() {
//! covers!(test_foo);
//! }
//! ```
//!
//! and in the code under test you write
//!
//! ```no-run
//! fn foo() {
//! if some_condition() {
//! tested_by!(test_foo);
//! }
//! }
//! ```
//!
//! This module then checks that executing the test indeed covers the specified
//! function. This is useful if you come back to the `foo` function ten years
//! later and wonder where the test are: now you can grep for `test_foo`.
#[macro_export]
macro_rules! tested_by {
($ident:ident) => {
#[cfg(test)]
{
crate::marks::marks::$ident.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
}
};
}
#[macro_export]
macro_rules! covers {
($ident:ident) => {
let _checker = crate::marks::marks::MarkChecker::new(&crate::marks::marks::$ident);
};
}
#[cfg(test)]
pub(crate) mod marks {
use std::sync::atomic::{AtomicUsize, Ordering};
pub(crate) struct MarkChecker {
mark: &'static AtomicUsize,
value_on_entry: usize,
}
impl MarkChecker {
pub(crate) fn new(mark: &'static AtomicUsize) -> MarkChecker {
let value_on_entry = mark.load(Ordering::SeqCst);
MarkChecker {
mark,
value_on_entry,
}
}
}
impl Drop for MarkChecker {
fn drop(&mut self) {
if std::thread::panicking() {
return;
}
let value_on_exit = self.mark.load(Ordering::SeqCst);
assert!(value_on_exit > self.value_on_entry, "mark was not hit")
}
}
macro_rules! mark {
($ident:ident) => {
#[allow(bad_style)]
pub(crate) static $ident: AtomicUsize = AtomicUsize::new(0);
};
}
mark!(name_res_works_for_broken_modules);
}
|
