test: localize calendar recurrence helper import (#4944)

* test: localize calendar recurrence helper import

* test: share calendar route import helper

tests/helpers/calendar_routes.py

@@ -0,0 +1,8 @@
+"""Shared imports for calendar route tests."""
+
+
+def import_calendar_routes():
+    """Import the calendar routes module after test stubs are installed."""
+    import routes.calendar_routes as cal
+
+    return cal

tests/test_calendar_parse_dt_naive.py

@@ -13,7 +13,7 @@ The fallback now normalizes to UTC and strips tz, exactly like the ISO path.
 """
 import pytest
 
-from tests.test_null_owner_gates import _import_calendar_helpers
+from tests.helpers.calendar_routes import import_calendar_routes
 
 # Inputs datetime.fromisoformat() rejects (so they hit the dateutil fallback)
 # but that carry a numeric UTC offset dateutil resolves to tz-aware.
@@ -25,7 +25,7 @@ _OFFSET_NONISO = [
 
 @pytest.mark.parametrize("s", _OFFSET_NONISO)
 def test_parse_dt_dateutil_fallback_returns_naive(s):
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     d = cal._parse_dt(s)
     assert d.tzinfo is None, f"{s!r} leaked tz-aware: {d!r}"
     # +0900 14:00 -> 05:00 UTC, naive.
@@ -34,13 +34,13 @@ def test_parse_dt_dateutil_fallback_returns_naive(s):
 
 @pytest.mark.parametrize("s", _OFFSET_NONISO)
 def test_parse_dt_pair_fallback_returns_naive(s):
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     dt, _is_utc = cal._parse_dt_pair(s)
     assert dt.tzinfo is None, f"{s!r} leaked tz-aware via _parse_dt_pair: {dt!r}"
 
 
 def test_parse_dt_naive_input_unchanged():
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     d = cal._parse_dt("January 5, 2026 14:00")  # no offset -> stays as parsed
     assert d.tzinfo is None
     assert (d.hour, d.minute) == (14, 0)

tests/test_calendar_recurrence.py

@@ -1,8 +1,8 @@
 """Regression tests for calendar recurrence expansion.
 
 Tests _expand_rrule and _resolve_base_uid — imported directly from
-routes/calendar_routes using the same stub-friendly import pattern
+routes/calendar_routes using the shared stub-friendly test helper.
-as test_null_owner_gates.py. No live DB or FastAPI test client needed.
+No live DB or FastAPI test client needed.
 """
 
 from datetime import datetime, timedelta
@@ -10,34 +10,34 @@ from types import SimpleNamespace
 
 import pytest
 
-from tests.test_null_owner_gates import _import_calendar_helpers
+from tests.helpers.calendar_routes import import_calendar_routes
 
 
 # ── _resolve_base_uid ──────────────────────────────────────────────────
 
 def test_resolve_base_uid_plain_passthrough():
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     assert cal._resolve_base_uid("evt-123") == "evt-123"
 
 
 def test_resolve_base_uid_compound_strips_suffix_date():
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     assert cal._resolve_base_uid("evt-123::2026-06-15") == "evt-123"
 
 
 def test_resolve_base_uid_compound_strips_suffix_datetime():
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     assert cal._resolve_base_uid("evt-123::2026-06-15T09:00") == "evt-123"
 
 
 def test_resolve_base_uid_rejects_empty():
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     with pytest.raises(ValueError, match="empty uid"):
         cal._resolve_base_uid("")
 
 
 def test_resolve_base_uid_rejects_missing_base():
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     with pytest.raises(ValueError, match="malformed compound UID"):
         cal._resolve_base_uid("::2026-06-15")
 
@@ -73,7 +73,7 @@ def _make_event(**overrides):
 
 def test_expand_non_recurring_returns_single():
     """Non-recurring events pass through unchanged with series_uid=uid."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(rrule="")
     results = cal._expand_rrule(ev, datetime(2026, 5, 1), datetime(2026, 7, 1))
 
@@ -90,7 +90,7 @@ def test_expand_yearly_old_dtstart_later_year_single_occurrence():
 
     This is the explicit regression case from PR review feedback.
     """
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-bday-001",
         summary="Annual Review",
@@ -118,7 +118,7 @@ def test_expand_yearly_narrow_window_after_dtstart_returns_one():
     """DTSTART=2020, query just two months in 2029 — should return
     exactly one occurrence (the one that falls in that window).
     """
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-ann",
         dtstart=datetime(2020, 3, 1),
@@ -137,7 +137,7 @@ def test_expand_yearly_strict_before_window_returns_empty():
     """DTSTART=2020, query a window that ends before the yearly
     occurrence in that year. Should return zero.
     """
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-late",
         dtstart=datetime(2020, 12, 25),
@@ -154,7 +154,7 @@ def test_expand_yearly_strict_after_window_returns_empty():
     """DTSTART=2020. Query a window that starts after the occurrence in
     that year. Should return zero.
     """
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-early",
         dtstart=datetime(2020, 1, 15),
@@ -171,7 +171,7 @@ def test_expand_weekly_unique_no_overwrites():
     """Multiple occurrences from the same series must have unique UIDs
     so _allEvents[uid] = ev doesn't overwrite earlier ones.
     """
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-wk",
         dtstart=datetime(2026, 6, 1, 9, 0),
@@ -192,7 +192,7 @@ def test_expand_weekly_unique_no_overwrites():
 
 
 def test_expand_monthly_all_day():
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-rent",
         dtstart=datetime(2026, 1, 1),
@@ -210,7 +210,7 @@ def test_expand_monthly_all_day():
 def test_expand_bad_rrule_graceful():
     """Malformed rrule should fall back to returning the base event,
     but only when the base event overlaps the requested window."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-broken",
         rrule="FREQ=GARBAGE",
@@ -225,7 +225,7 @@ def test_expand_bad_rrule_graceful():
 def test_expand_bad_rrule_fallback_rejects_non_overlapping():
     """Malformed rrule with a base event outside the requested window
     must return zero results, not leak the event into an unrelated range."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-old-broken",
         dtstart=datetime(2020, 1, 1, 9, 0),
@@ -243,7 +243,7 @@ def test_expand_bad_rrule_fallback_rejects_non_overlapping():
 def test_expand_exclusive_end_boundary():
     """An occurrence whose start equals the window end must be excluded.
     The contract is [start, end), same as the non-recurring SQL filter."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-daily",
         dtstart=datetime(2026, 6, 1, 9, 0),
@@ -260,7 +260,7 @@ def test_expand_exclusive_end_boundary():
 def test_expand_multi_day_crossing_range_start():
     """A multi-day occurrence that starts before the window but ends inside
     it must be included (matching non-recurring overlap: dtend > start)."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-weekly-multi",
         summary="Weekend Trip",
@@ -285,7 +285,7 @@ def test_expand_multi_day_crossing_range_start():
 def test_expand_multi_day_fully_before_window():
     """A multi-day occurrence that ends exactly at the window start
     must be excluded (occ_end <= start)."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-multi",
         dtstart=datetime(2026, 5, 29, 18, 0),
@@ -301,7 +301,7 @@ def test_expand_multi_day_fully_before_window():
 def test_expand_metadata_inheritance():
     """Occurrence dicts must carry the base event's metadata
     (summary, importance, event_type, color, location)."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-meta",
         summary="Board Meeting",
@@ -323,7 +323,7 @@ def test_expand_metadata_inheritance():
 
 def test_expand_daily_rrule_large_window_is_capped_and_marked_truncated():
     """Wide recurring windows must not materialize unbounded occurrence lists."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(
         uid="evt-daily-cap",
         dtstart=datetime(2020, 1, 1, 9, 0),

tests/test_calendar_rrule_until_utc.py

@@ -24,7 +24,7 @@ UNTIL must expand to all of its occurrences.
 from datetime import datetime
 from types import SimpleNamespace
 
-from tests.test_null_owner_gates import _import_calendar_helpers
+from tests.helpers.calendar_routes import import_calendar_routes
 
 
 _MOCK_CAL = SimpleNamespace(name="Personal", color="#5b8abf")
@@ -55,7 +55,7 @@ def _make_event(**overrides):
 def test_expand_rrule_with_utc_until_keeps_all_occurrences():
     """FREQ=DAILY;UNTIL=...Z must expand to every occurrence, not collapse
     to a single non-recurring event."""
-    cal = _import_calendar_helpers()
+    cal = import_calendar_routes()
     ev = _make_event(rrule="FREQ=DAILY;UNTIL=20240105T090000Z")
 
     results = cal._expand_rrule(ev, datetime(2024, 1, 1), datetime(2024, 1, 10))

tests/test_ics_escape.py

@@ -1,9 +1,9 @@
 """Tests for iCalendar TEXT escaping in calendar export (RFC 5545 §3.3.11)."""
-from tests.test_null_owner_gates import _import_calendar_helpers
+from tests.helpers.calendar_routes import import_calendar_routes
 
 
 def _esc():
-    return _import_calendar_helpers()._ics_escape
+    return import_calendar_routes()._ics_escape
 
 
 def test_escapes_comma_and_semicolon():
@@ -26,7 +26,7 @@ def test_empty_and_none_safe():
 
 
 def test_safe_ics_filename_strips_header_metacharacters():
-    safe_filename = _import_calendar_helpers()._safe_ics_filename
+    safe_filename = import_calendar_routes()._safe_ics_filename
 
     assert (
         safe_filename('Work\r\nX-Injected: yes";/..\\evil')
@@ -35,7 +35,7 @@ def test_safe_ics_filename_strips_header_metacharacters():
 
 
 def test_safe_ics_filename_falls_back_for_empty_names():
-    safe_filename = _import_calendar_helpers()._safe_ics_filename
+    safe_filename = import_calendar_routes()._safe_ics_filename
 
     assert safe_filename("////") == "calendar.ics"
     assert safe_filename(None) == "calendar.ics"

tests/test_null_owner_gates.py

@@ -18,6 +18,8 @@ import pytest
 from types import SimpleNamespace
 from unittest.mock import MagicMock
 
+from tests.helpers.calendar_routes import import_calendar_routes
+
 # `tests/conftest.py` stubs the heavy optional deps. We additionally
 # stub `core.database` here because the real module instantiates
 # SQLAlchemy declarative classes at import-time — which blows up under
@@ -64,20 +66,8 @@ from fastapi import HTTPException
 # calendar._get_or_404_calendar / _get_or_404_event
 # ---------------------------------------------------------------------------
 
-def _import_calendar_helpers():
-    """Import the two private gate helpers without booting the full
-    calendar router. We patch sys.modules so the module-load side
-    effects (DB import) don't blow up under the conftest stubs."""
-    mod_name = "routes.calendar_routes"
-    if mod_name in sys.modules:
-        return sys.modules[mod_name]
-    # core.database is stubbed by conftest already; the module should
-    # import cleanly.
-    return __import__(mod_name, fromlist=["_get_or_404_calendar", "_get_or_404_event"])
-
-
 def test_calendar_gate_rejects_null_owner_for_authenticated_user():
-    cal_mod = _import_calendar_helpers()
+    cal_mod = import_calendar_routes()
     db = MagicMock()
     cal = SimpleNamespace(id="c1", owner=None)
     db.query.return_value.filter.return_value.first.return_value = cal
@@ -87,7 +77,7 @@ def test_calendar_gate_rejects_null_owner_for_authenticated_user():
 
 
 def test_calendar_gate_rejects_cross_owner():
-    cal_mod = _import_calendar_helpers()
+    cal_mod = import_calendar_routes()
     db = MagicMock()
     cal = SimpleNamespace(id="c1", owner="bob")
     db.query.return_value.filter.return_value.first.return_value = cal
@@ -97,7 +87,7 @@ def test_calendar_gate_rejects_cross_owner():
 
 
 def test_calendar_gate_accepts_matching_owner():
-    cal_mod = _import_calendar_helpers()
+    cal_mod = import_calendar_routes()
     db = MagicMock()
     cal = SimpleNamespace(id="c1", owner="alice")
     db.query.return_value.filter.return_value.first.return_value = cal
@@ -106,7 +96,7 @@ def test_calendar_gate_accepts_matching_owner():
 
 
 def test_calendar_event_gate_rejects_null_owner_calendar():
-    cal_mod = _import_calendar_helpers()
+    cal_mod = import_calendar_routes()
     db = MagicMock()
     cal = SimpleNamespace(owner=None)
     ev = SimpleNamespace(uid="e1", calendar=cal)
@@ -117,7 +107,7 @@ def test_calendar_event_gate_rejects_null_owner_calendar():
 
 
 def test_calendar_event_gate_rejects_cross_owner():
-    cal_mod = _import_calendar_helpers()
+    cal_mod = import_calendar_routes()
     db = MagicMock()
     cal = SimpleNamespace(owner="bob")
     ev = SimpleNamespace(uid="e1", calendar=cal)