116 lines
3.9 KiB
Rust
116 lines
3.9 KiB
Rust
//! Tests for the calendar conversions.
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//!
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//! 日历换算的测试。
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use apsis_time::{Calendar, days_in_month, is_leap_year, mjd_from_ymd, ymd_from_mjd};
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#[test]
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fn modified_julian_date_zero_is_the_documented_day() {
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assert_eq!(mjd_from_ymd(1858, 11, 17), 0.0);
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assert_eq!(ymd_from_mjd(0.0), (1858, 11, 17));
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}
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#[test]
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fn known_dates_map_to_known_modified_julian_dates() {
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assert_eq!(mjd_from_ymd(1970, 1, 1), 40_587.0);
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assert_eq!(mjd_from_ymd(2000, 1, 1), 51_544.0);
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assert_eq!(mjd_from_ymd(2017, 1, 1), 57_754.0);
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assert_eq!(mjd_from_ymd(2024, 1, 1), 60_310.0);
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}
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#[test]
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fn calendar_conversion_round_trips_over_a_long_span() {
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// Walk day by day over a span that crosses every leap year rule.
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// 逐日走过一个跨越每条闰年规则的跨度。
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let mut mjd = mjd_from_ymd(1899, 12, 20);
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let end = mjd_from_ymd(2101, 1, 10);
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while mjd < end {
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let (year, month, day) = ymd_from_mjd(mjd);
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assert_eq!(
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mjd_from_ymd(year, month, day),
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mjd,
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"round trip failed at MJD {mjd}"
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);
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mjd += 1.0;
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}
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}
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#[test]
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fn fractional_modified_julian_dates_map_to_the_containing_day() {
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let day = mjd_from_ymd(2024, 6, 15);
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assert_eq!(ymd_from_mjd(day + 0.25), (2024, 6, 15));
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assert_eq!(ymd_from_mjd(day + 0.75), (2024, 6, 15));
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// One day later, but still the same instant of the following day.
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// 晚一天，但仍是次日的同一瞬时。
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assert_eq!(ymd_from_mjd(day + 1.25), (2024, 6, 16));
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}
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#[test]
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fn leap_years_follow_the_gregorian_rule() {
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assert!(is_leap_year(2000));
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assert!(is_leap_year(2024));
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assert!(!is_leap_year(1900));
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assert!(!is_leap_year(2100));
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assert!(!is_leap_year(2023));
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// Year zero is a leap year in the proleptic calendar.
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// 在外推日历中零年是闰年。
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assert!(is_leap_year(0));
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}
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#[test]
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fn february_length_follows_the_leap_year_rule() {
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assert_eq!(days_in_month(2024, 2), 29);
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assert_eq!(days_in_month(2023, 2), 28);
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assert_eq!(days_in_month(1900, 2), 28);
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assert_eq!(days_in_month(2000, 2), 29);
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}
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#[test]
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fn days_in_month_rejects_invalid_months() {
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assert_eq!(days_in_month(2024, 0), 0);
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assert_eq!(days_in_month(2024, 13), 0);
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}
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#[test]
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fn every_month_has_the_expected_length() {
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let expected = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
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for (index, days) in expected.iter().enumerate() {
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let month = index as u32 + 1;
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assert_eq!(days_in_month(2023, month), *days, "month {month}");
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}
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}
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#[test]
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fn validation_accepts_real_dates() {
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assert!(Calendar::from_ymd(2024, 2, 29).is_valid());
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assert!(Calendar::new(2016, 12, 31, 23, 59, 59.5).is_valid());
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}
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#[test]
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fn validation_rejects_impossible_dates_and_the_leap_second_label() {
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assert!(!Calendar::from_ymd(2023, 2, 29).is_valid());
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assert!(!Calendar::from_ymd(2024, 13, 1).is_valid());
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assert!(!Calendar::from_ymd(2024, 1, 0).is_valid());
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assert!(!Calendar::from_ymd(2024, 1, 32).is_valid());
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assert!(!Calendar::new(2024, 1, 1, 24, 0, 0.0).is_valid());
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assert!(!Calendar::new(2024, 1, 1, 0, 60, 0.0).is_valid());
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// Second 60 is the leap second label, which is not a representable
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// instant on the continuous Modified Julian Date scale.
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// 第 60 秒是闰秒标签，它在连续的约化儒略日尺度上不是可表示的瞬时。
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assert!(!Calendar::new(2016, 12, 31, 23, 59, 60.0).is_valid());
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assert!(!Calendar::new(2024, 1, 1, 0, 0, 61.0).is_valid());
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}
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#[test]
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fn seconds_of_day_accumulates_the_time_fields() {
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let calendar = Calendar::new(2024, 1, 1, 1, 2, 3.5);
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assert!((calendar.seconds_of_day() - 3_723.5).abs() < 1e-12);
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assert_eq!(Calendar::from_ymd(2024, 1, 1).seconds_of_day(), 0.0);
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}
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#[test]
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fn display_uses_an_iso_style_layout() {
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let calendar = Calendar::new(2024, 6, 15, 12, 30, 45.25);
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assert_eq!(calendar.to_string(), "2024-06-15T12:30:45.250");
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}
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