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sanity check time values a bit more #1292

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Apr 1, 2020
Merged

sanity check time values a bit more #1292

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12 changes: 10 additions & 2 deletions tests/run-pass/time.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,16 +3,22 @@
use std::time::{SystemTime, Instant};

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!(diff.as_micros() > 0);
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);

// Check `Instant`.
#[cfg(not(windows))] // `Instant` shims not yet implemented on Windows
{
let now1 = Instant::now();
Expand All @@ -24,9 +30,11 @@ fn main() {
#[cfg(target_os = "linux")] // TODO: macOS does not support Instant subtraction
{
let diff = now2.duration_since(now1);
assert!(diff.as_micros() > 0);
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);
}
}
}