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//! Assert a condition is true.
//!
//! Pseudocode:<br>
//! condition
//!
//! * If true, return Result `Ok(())`.
//!
//! * Otherwise, return Result `Err(message)`.
//!
//! This macro provides the same statements as [`assert`](macro@assert),
//! except this macro returns a Result, rather than doing a panic.
//!
//! This macro is useful for runtime checks, such as checking parameters,
//! or sanitizing inputs, or handling different results in different ways.
//!
//! # Module macros
//!
//! * [`assert_as_result`](macro.assert_as_result.html)
/// Assert a condition is true.
///
/// Pseudocode:<br>
/// condition
///
/// * If true, return Result `Ok(())`.
///
/// * Otherwise, return Result `Err(message)`.
///
/// This macro is useful for runtime checks, such as checking parameters,
/// or sanitizing inputs, or handling different results in different ways.
///
/// # Module macros
///
/// * [`assert_as_result`](macro.assert_as_result.html)
///
#[macro_export]
macro_rules! assert_as_result {
($a:expr $(,)?) => {
match ($a) {
a => {
if a {
Ok(())
} else {
Err(format!(
concat!(
"assertion failed: `assert!(condition)`\n",
"https://docs.rs/assertables/9.9.0/assertables/macro.assert.html\n",
" condition label: `{}`,\n",
" condition debug: `{:?}`,\n",
),
stringify!($a),
a,
))
}
}
}
};
}
#[cfg(test)]
mod test_assert_as_result {
// use std::sync::Once;
#[test]
fn success() {
let a = true;
for _ in 0..1 {
let actual = assert_as_result!(a);
let expect = ();
assert_eq!(actual.unwrap(), expect);
}
}
#[test]
fn failure() {
let a = false;
let actual = assert_as_result!(a);
let message = concat!(
"assertion failed: `assert!(condition)`\n",
"https://docs.rs/assertables/9.9.0/assertables/macro.assert.html\n",
" condition label: `a`,\n",
" condition debug: `false`,\n",
);
assert_eq!(actual.unwrap_err(), message);
}
}