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Relax exact interval tests

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Should make this more resilient to rounding errors on Windows
This commit is contained in:
Alex Crichton
2017-09-11 07:44:32 -07:00
parent 5e92b10f3f
commit e0b751b013
1 changed files with 24 additions and 11 deletions
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src/reactor/interval.rs
+24 -11
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@@ -135,25 +135,38 @@ mod test {
Duration::from_millis(millis) Duration::from_millis(millis)
} }
// The math around Instant/Duration isn't 100% precise due to rounding
// errors, see #249 for more info
fn almost_eq(a: Instant, b: Instant) -> bool {
if a == b {
true
} else if a > b {
a - b < Duration::from_millis(1)
} else {
b - a < Duration::from_millis(1)
}
}
#[test] #[test]
fn norm_next() { fn norm_next() {
let tm = Timeline::new(); let tm = Timeline::new();
assert_eq!(next_interval(tm.at(1), tm.at(2), dur(10)), tm.at(11)); assert!(almost_eq(next_interval(tm.at(1), tm.at(2), dur(10)),
assert_eq!(next_interval(tm.at(7777), tm.at(7788), dur(100)), tm.at(11)));
tm.at(7877)); assert!(almost_eq(next_interval(tm.at(7777), tm.at(7788), dur(100)),
assert_eq!(next_interval(tm.at(1), tm.at(1000), dur(2100)), tm.at(7877)));
tm.at(2101)); assert!(almost_eq(next_interval(tm.at(1), tm.at(1000), dur(2100)),
tm.at(2101)));
} }
#[test] #[test]
fn fast_forward() { fn fast_forward() {
let tm = Timeline::new(); let tm = Timeline::new();
assert_eq!(next_interval(tm.at(1), tm.at(1000), dur(10)), assert!(almost_eq(next_interval(tm.at(1), tm.at(1000), dur(10)),
tm.at(1001)); tm.at(1001)));
assert_eq!(next_interval(tm.at(7777), tm.at(8888), dur(100)), assert!(almost_eq(next_interval(tm.at(7777), tm.at(8888), dur(100)),
tm.at(8977)); tm.at(8977)));
assert_eq!(next_interval(tm.at(1), tm.at(10000), dur(2100)), assert!(almost_eq(next_interval(tm.at(1), tm.at(10000), dur(2100)),
tm.at(10501)); tm.at(10501)));
} }
/// TODO: this test actually should be successful, but since we can't /// TODO: this test actually should be successful, but since we can't