other tests

Author: pitdicker

src/datetime/tests.rs

@@ -1437,6 +1437,65 @@ fn test_min_max_setters() {
     assert_eq!(beyond_max.with_nanosecond(beyond_max.nanosecond()), Some(beyond_max));
 }
 
+#[test]
+fn test_min_max_complex() {
+    let offset_min = FixedOffset::west_opt(2 * 60 * 60).unwrap();
+    let beyond_min = offset_min.from_utc_datetime(&NaiveDateTime::MIN);
+    let offset_max = FixedOffset::east_opt(2 * 60 * 60).unwrap();
+    let beyond_max = offset_max.from_utc_datetime(&NaiveDateTime::MAX);
+    let max_time = NaiveTime::from_hms_nano_opt(23, 59, 59, 999_999_999).unwrap();
+
+    assert_eq!(beyond_min.checked_add_days(Days::new(0)), Some(beyond_min));
+    assert_eq!(
+        beyond_min.checked_add_days(Days::new(1)),
+        Some(offset_min.from_utc_datetime(&(NaiveDate::MIN + Days(1)).and_time(NaiveTime::MIN)))
+    );
+    assert_eq!(beyond_min.checked_sub_days(Days::new(0)), Some(beyond_min));
+    assert_eq!(beyond_min.checked_sub_days(Days::new(1)), None);
+    assert_eq!(beyond_min.checked_add_months(Months::new(0)), Some(beyond_min));
+    assert_eq!(
+        beyond_min.checked_add_months(Months::new(1)),
+        Some(offset_min.from_utc_datetime(&(NaiveDate::MIN + Months(1)).and_time(NaiveTime::MIN)))
+    );
+    assert_eq!(beyond_min.checked_sub_months(Months::new(0)), Some(beyond_min));
+    assert_eq!(beyond_min.checked_sub_months(Months::new(1)), None);
+    assert_eq!(beyond_min.with_year(beyond_min.year()), Some(beyond_min));
+    let res = NaiveDate::MIN.with_year(2021).unwrap().and_time(NaiveTime::MIN) + offset_min;
+    assert_eq!(beyond_min.with_year(2020), offset_min.from_local_datetime(&res).single());
+    assert_eq!(
+        offset_min
+            .from_utc_datetime(
+                &NaiveDate::from_ymd_opt(2023, 1, 1).unwrap().and_time(NaiveTime::MIN)
+            )
+            .with_year(NaiveDate::MIN.year() - 1),
+        Some(beyond_min)
+    );
+
+    assert_eq!(beyond_max.checked_add_days(Days::new(0)), Some(beyond_max));
+    assert_eq!(beyond_max.checked_add_days(Days::new(1)), None);
+    assert_eq!(beyond_max.checked_sub_days(Days::new(0)), Some(beyond_max));
+    assert_eq!(
+        beyond_max.checked_sub_days(Days::new(1)),
+        Some(offset_max.from_utc_datetime(&(NaiveDate::MAX - Days(1)).and_time(max_time)))
+    );
+    assert_eq!(beyond_max.checked_add_months(Months::new(0)), Some(beyond_max));
+    assert_eq!(beyond_max.checked_add_months(Months::new(1)), None);
+    assert_eq!(beyond_max.checked_sub_months(Months::new(0)), Some(beyond_max));
+    assert_eq!(
+        beyond_max.checked_sub_months(Months::new(1)),
+        Some(offset_max.from_utc_datetime(&(NaiveDate::MAX - Months(1)).and_time(max_time)))
+    );
+    assert_eq!(beyond_max.with_year(beyond_max.year()), Some(beyond_max));
+    let res = NaiveDate::MAX.with_year(2019).unwrap().and_time(max_time) + offset_max;
+    assert_eq!(beyond_max.with_year(2020), offset_max.from_local_datetime(&res).single());
+    assert_eq!(
+        offset_max
+            .from_utc_datetime(&NaiveDate::from_ymd_opt(2023, 12, 31).unwrap().and_time(max_time))
+            .with_year(NaiveDate::MAX.year() + 1),
+        Some(beyond_max)
+    );
+}
+
 #[test]
 #[should_panic]
 fn test_local_beyond_min_datetime() {