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//! Duration comparison matchers.
use std::time::Duration;
use crate::error::MatchError;
use crate::expectation::Expectation;
impl Expectation<Duration> {
/// Asserts the duration is shorter than the given bound.
///
/// # Errors
///
/// Returns [`MatchError`] if the duration is greater than or equal to the bound.
///
/// ```text
/// expect!(elapsed)
/// actual: 5s
/// expected: to be shorter than 1s
/// ```
///
/// # Examples
///
/// ```
/// use std::time::Duration;
/// use behave::Expectation;
///
/// let result = Expectation::new(Duration::from_millis(500), "d")
/// .to_be_shorter_than(Duration::from_secs(1));
/// assert!(result.is_ok());
/// ```
pub fn to_be_shorter_than(&self, bound: Duration) -> Result<(), MatchError> {
let is_match = *self.value() < bound;
self.check(is_match, format!("to be shorter than {}", fmt_dur(bound)))
}
/// Asserts the duration is longer than the given bound.
///
/// # Errors
///
/// Returns [`MatchError`] if the duration is less than or equal to the bound.
///
/// # Examples
///
/// ```
/// use std::time::Duration;
/// use behave::Expectation;
///
/// let result = Expectation::new(Duration::from_secs(2), "d")
/// .to_be_longer_than(Duration::from_secs(1));
/// assert!(result.is_ok());
/// ```
pub fn to_be_longer_than(&self, bound: Duration) -> Result<(), MatchError> {
let is_match = *self.value() > bound;
self.check(is_match, format!("to be longer than {}", fmt_dur(bound)))
}
/// Asserts the duration is within `tolerance` of the expected value.
///
/// Checks that `|actual - expected| <= tolerance` using saturating
/// arithmetic to avoid underflow.
///
/// # Errors
///
/// Returns [`MatchError`] if the difference exceeds the tolerance.
///
/// # Examples
///
/// ```
/// use std::time::Duration;
/// use behave::Expectation;
///
/// let result = Expectation::new(Duration::from_millis(1050), "d")
/// .to_be_close_to_duration(
/// Duration::from_secs(1),
/// Duration::from_millis(100),
/// );
/// assert!(result.is_ok());
/// ```
pub fn to_be_close_to_duration(
&self,
expected: Duration,
tolerance: Duration,
) -> Result<(), MatchError> {
let actual = *self.value();
let diff = abs_diff(actual, expected);
let is_match = diff <= tolerance;
self.check(
is_match,
format!(
"to be within {} of {}",
fmt_dur(tolerance),
fmt_dur(expected),
),
)
}
}
/// Absolute difference between two durations using saturating subtraction.
fn abs_diff(a: Duration, b: Duration) -> Duration {
if a >= b {
a.saturating_sub(b)
} else {
b.saturating_sub(a)
}
}
/// Formats a duration for human-readable error messages.
fn fmt_dur(d: Duration) -> String {
format!("{d:?}")
}
#[cfg(test)]
mod tests {
use std::time::Duration;
use crate::Expectation;
// --- to_be_shorter_than ---
#[test]
fn shorter_than_pass() {
assert!(Expectation::new(Duration::from_millis(500), "d")
.to_be_shorter_than(Duration::from_secs(1))
.is_ok());
}
#[test]
fn shorter_than_fail_equal() {
assert!(Expectation::new(Duration::from_secs(1), "d")
.to_be_shorter_than(Duration::from_secs(1))
.is_err());
}
#[test]
fn shorter_than_fail_greater() {
assert!(Expectation::new(Duration::from_secs(2), "d")
.to_be_shorter_than(Duration::from_secs(1))
.is_err());
}
#[test]
fn shorter_than_negated() {
assert!(Expectation::new(Duration::from_secs(2), "d")
.negate()
.to_be_shorter_than(Duration::from_secs(1))
.is_ok());
}
// --- to_be_longer_than ---
#[test]
fn longer_than_pass() {
assert!(Expectation::new(Duration::from_secs(2), "d")
.to_be_longer_than(Duration::from_secs(1))
.is_ok());
}
#[test]
fn longer_than_fail_equal() {
assert!(Expectation::new(Duration::from_secs(1), "d")
.to_be_longer_than(Duration::from_secs(1))
.is_err());
}
#[test]
fn longer_than_fail_less() {
assert!(Expectation::new(Duration::from_millis(500), "d")
.to_be_longer_than(Duration::from_secs(1))
.is_err());
}
#[test]
fn longer_than_negated() {
assert!(Expectation::new(Duration::from_millis(500), "d")
.negate()
.to_be_longer_than(Duration::from_secs(1))
.is_ok());
}
// --- to_be_close_to_duration ---
#[test]
fn close_to_pass() {
assert!(Expectation::new(Duration::from_millis(1050), "d")
.to_be_close_to_duration(Duration::from_secs(1), Duration::from_millis(100),)
.is_ok());
}
#[test]
fn close_to_fail() {
assert!(Expectation::new(Duration::from_millis(1200), "d")
.to_be_close_to_duration(Duration::from_secs(1), Duration::from_millis(100),)
.is_err());
}
#[test]
fn close_to_exact() {
assert!(Expectation::new(Duration::from_secs(1), "d")
.to_be_close_to_duration(Duration::from_secs(1), Duration::from_millis(0),)
.is_ok());
}
#[test]
fn close_to_negated() {
assert!(Expectation::new(Duration::from_millis(1200), "d")
.negate()
.to_be_close_to_duration(Duration::from_secs(1), Duration::from_millis(100),)
.is_ok());
}
}