40 lines
1.3 KiB
Rust
40 lines
1.3 KiB
Rust
// compile-flags: -Zmiri-disable-isolation
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use std::time::{SystemTime, Instant, Duration};
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fn duration_sanity(diff: Duration) {
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// On my laptop, I observed times around 15-40ms. Add 10x lee-way both ways.
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assert!(diff.as_millis() > 1);
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assert!(diff.as_millis() < 500);
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}
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fn main() {
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// Check `SystemTime`.
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let now1 = SystemTime::now();
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let seconds_since_epoch = now1.duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
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let years_since_epoch = seconds_since_epoch / 3600 / 24 / 365;
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let year = 1970 + years_since_epoch;
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assert!(2020 <= year && year < 2100);
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// Do some work to make time pass.
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for _ in 0..10 { drop(vec![42]); }
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let now2 = SystemTime::now();
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assert!(now2 > now1);
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// Sanity-check the difference we got.
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let diff = now2.duration_since(now1).unwrap();
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assert_eq!(now1 + diff, now2);
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assert_eq!(now2 - diff, now1);
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duration_sanity(diff);
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// Check `Instant`.
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let now1 = Instant::now();
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// Do some work to make time pass.
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for _ in 0..10 { drop(vec![42]); }
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let now2 = Instant::now();
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assert!(now2 > now1);
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// Sanity-check the difference we got.
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let diff = now2.duration_since(now1);
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assert_eq!(now1 + diff, now2);
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assert_eq!(now2 - diff, now1);
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duration_sanity(diff);
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}
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