allow-core 0.1.3

Core types and matching primitives for cargo-allow source exception policies.
Documentation 
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use std::time::{SystemTime, UNIX_EPOCH};

use crate::SimpleDate;

#[test]
fn simple_date_rejects_invalid_calendar_dates() {
    assert!(SimpleDate::parse("2026-02-29").is_none());
    assert!(SimpleDate::parse("2024-02-29").is_some());
    assert!(SimpleDate::parse("2026-04-31").is_none());
    assert!(SimpleDate::parse("2026-13-01").is_none());
}

#[test]
fn simple_date_counts_days_between_dates() {
    let start = SimpleDate::parse("2026-05-26")
        .unwrap_or_else(|| std::panic::panic_any("valid start date"));
    let end =
        SimpleDate::parse("2026-08-01").unwrap_or_else(|| std::panic::panic_any("valid end date"));

    assert_eq!(start.days_until(end), 67);
}

#[test]
fn simple_date_adds_days_across_months() {
    let start = SimpleDate::parse("2026-05-26")
        .unwrap_or_else(|| std::panic::panic_any("valid start date"));

    assert_eq!(start.add_days(67).to_string(), "2026-08-01");
}

#[test]
fn simple_date_converts_unix_epoch_days() {
    assert_eq!(
        SimpleDate::from_days_since_unix_epoch(0).to_string(),
        "1970-01-01"
    );
    assert_eq!(
        SimpleDate::from_days_since_unix_epoch(
            SimpleDate::parse("2026-05-27")
                .unwrap_or_else(|| std::panic::panic_any("valid date"))
                .days_since_unix_epoch()
        )
        .to_string(),
        "2026-05-27"
    );
}

#[test]
fn today_utc_approx_uses_system_clock_day() {
    let before = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .map(|duration| duration.as_secs() / 86_400)
        .unwrap_or(0);
    let today = SimpleDate::today_utc_approx();
    let after = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .map(|duration| duration.as_secs() / 86_400)
        .unwrap_or(0);

    let today_days = today.days_since_unix_epoch() as u64;
    assert!(
        (before..=after).contains(&today_days),
        "today_utc_approx should use the current UTC day"
    );
}