Track dates of English school holidays

Fixes #168

tests/test_school_holiday.py

@@ -0,0 +1,50 @@
+"""Tests for UK school holiday parsing."""
+
+from __future__ import annotations
+
+import datetime
+from pathlib import Path
+
+from agenda import uk_school_holiday
+
+
+def test_parse_school_holidays_from_ics() -> None:
+    """Parse holiday ranges and skip bank-holiday events."""
+    ics_text = """BEGIN:VCALENDAR
+BEGIN:VEVENT
+DTSTART;VALUE=DATE:20260525
+DTEND;VALUE=DATE:20260601
+SUMMARY;LANGUAGE=en-gb:Half Term Holiday (Bristol notes)
+END:VEVENT
+BEGIN:VEVENT
+DTSTART;VALUE=DATE:20260831
+DTEND;VALUE=DATE:20260901
+SUMMARY;LANGUAGE=en-gb:Summer Bank Holiday
+END:VEVENT
+END:VCALENDAR
+"""
+
+    parsed = uk_school_holiday.parse_school_holidays_from_ics(ics_text)
+    assert len(parsed) == 1
+    assert parsed[0].name == "uk_school_holiday"
+    assert parsed[0].title == "Half Term Holiday"
+    assert parsed[0].as_date == datetime.date(2026, 5, 25)
+    assert parsed[0].end_as_date == datetime.date(2026, 5, 31)
+
+
+def test_school_holiday_list_filters_overlap(tmp_path: Path) -> None:
+    """Filter cached school holiday ranges by overlap."""
+    filename = uk_school_holiday.json_filename(str(tmp_path))
+    with open(filename, "w", encoding="utf-8") as out:
+        out.write(
+            '[{"name":"uk_school_holiday","title":"Easter Holiday",'
+            '"start":"2026-04-01","end":"2026-04-12","url":""}]'
+        )
+
+    events = uk_school_holiday.school_holiday_list(
+        datetime.date(2026, 4, 10),
+        datetime.date(2026, 4, 20),
+        str(tmp_path),
+    )
+    assert len(events) == 1
+    assert events[0].title == "Easter Holiday"