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Auto merge of #1336 - RalfJung:instance-sanity, r=RalfJung

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tighten Instance sanity check

Let's see if we can get away with this...
This commit is contained in:
bors 2020-04-15 11:34:34 +00:00
commit e4eceba7d3
1 changed files with 18 additions and 12 deletions
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30
tests/run-pass/time.rs
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@ -1,22 +1,29 @@
// compile-flags: -Zmiri-disable-isolation
use std::time::{SystemTime, Instant};
use std::time::{SystemTime, Instant, Duration};
fn duration_sanity(diff: Duration) {
// On my laptop, I observed times around 15-40ms. Add 10x lee-way both ways.
assert!(diff.as_millis() > 1);
assert!(diff.as_millis() < 500);
}
fn main() {
// Check `SystemTime`.
let now1 = SystemTime::now();
// Do some work to make time pass.
for _ in 0..10 { drop(vec![42]); }
let now2 = SystemTime::now();
assert!(now2 > now1);
let diff = now2.duration_since(now1).unwrap();
assert_eq!(now1 + diff, now2);
assert_eq!(now2 - diff, now1);
// Sanity-check the time we got.
let seconds_since_epoch = now1.duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
let years_since_epoch = seconds_since_epoch / 3600 / 24 / 365;
let year = 1970 + years_since_epoch;
assert!(2020 <= year && year < 2100);
// Do some work to make time pass.
for _ in 0..10 { drop(vec![42]); }
let now2 = SystemTime::now();
assert!(now2 > now1);
// Sanity-check the difference we got.
let diff = now2.duration_since(now1).unwrap();
assert_eq!(now1 + diff, now2);
assert_eq!(now2 - diff, now1);
duration_sanity(diff);
// Check `Instant`.
let now1 = Instant::now();
@ -24,10 +31,9 @@ fn main() {
for _ in 0..10 { drop(vec![42]); }
let now2 = Instant::now();
assert!(now2 > now1);
// Sanity-check the difference we got.
let diff = now2.duration_since(now1);
assert_eq!(now1 + diff, now2);
assert_eq!(now2 - diff, now1);
// Sanity-check the difference we got.
assert!(diff.as_micros() > 1);
assert!(diff.as_micros() < 1_000_000);
duration_sanity(diff);
}