Add regression tests for far-future overflow

Author: tamsk-91

tests/test_time.py

@@ -196,6 +196,9 @@ def test_naturaldelta_too_large_value_raises() -> None:
         (NOW - dt.timedelta(days=365 + 35), "1 year, 1 month ago"),
         (dt.timedelta(days=-10000), "27 years from now"),
         (dt.timedelta(days=365 + 35), "1 year, 1 month ago"),
+        # far-future values used to raise OverflowError in _abs_timedelta
+        (dt.datetime(9999, 12, 31), "7,995 years from now"),
+        (dt.timedelta(days=-800_000), "2,192 years from now"),
         (22.5, "22 seconds ago"),
         (23.5, "24 seconds ago"),
         (23.9, "24 seconds ago"),
@@ -645,6 +648,12 @@ def test_precisedelta_one_unit_enough(
         (dt.timedelta(days=32), "seconds", "1 month and 1 day"),
         (dt.timedelta(days=62), "seconds", "2 months and 1 day"),
         (dt.timedelta(days=92), "seconds", "3 months"),
+        # a negative delta reaching back past year 1 used to raise OverflowError
+        (
+            dt.timedelta(days=-800_000),
+            "seconds",
+            "2,191 years, 9 months and 10 days",
+        ),
         (dt.timedelta(days=31), "days", "1 month"),
         (dt.timedelta(days=32), "days", "1 month and 1 day"),
         (dt.timedelta(days=62), "days", "2 months and 1 day"),