fix: validate complete-day monitoring coverage

tests/test_tui.py

@@ -60,6 +60,13 @@ def _clock(year=2026, month=9, day=30, hour=12):
     return datetime(year, month, day, hour, 0, 0, tzinfo=timezone.utc)
 
 
+class _FrozenTuiDateTime(datetime):
+    @classmethod
+    def now(cls, tz=None):
+        instant = datetime(2026, 9, 28, 12, 0, 0, tzinfo=timezone.utc)
+        return instant.replace(tzinfo=None) if tz is None else instant.astimezone(tz)
+
+
 def _insert_baseline(conn, tbw_tb=1.0, verified=True,
                       model="Samsung SSD 970 EVO Plus 1TB"):
     conn.execute(
@@ -1022,7 +1029,7 @@ class TestBarGraphTUI:
             assert len(graph._day_data) == 90
 
     @pytest.mark.asyncio
-    async def test_readout_updates_on_selection(self, tmp_path):
+    async def test_readout_updates_on_selection(self, tmp_path, monkeypatch):
         """Readout shows selected day info."""
         conn = init_store(tmp_path / "test.db")
         _insert_segment(conn)
@@ -1034,6 +1041,7 @@ class TestBarGraphTUI:
         _insert_sample(conn, "2026-09-30T10:00:00+00:00")
         conn.close()
 
+        monkeypatch.setattr("fenris.tui.datetime", _FrozenTuiDateTime)
         app = FenrisTuiApp(store_path=tmp_path / "test.db")
         async with app.run_test(size=(80, 24)) as pilot:
             await pilot.press("v", "v")
@@ -1056,7 +1064,7 @@ class TestBarGraphTUI:
             assert "W 0.105 GB known" in readout
 
     @pytest.mark.asyncio
-    async def test_hourly_drill_down_and_back(self, tmp_path):
+    async def test_hourly_drill_down_and_back(self, tmp_path, monkeypatch):
         """Enter drills into hourly view, Esc returns to daily."""
         conn = init_store(tmp_path / "test.db")
         _insert_segment(conn)
@@ -1073,6 +1081,7 @@ class TestBarGraphTUI:
         _insert_sample(conn, "2026-09-30T10:00:00+00:00")
         conn.close()
 
+        monkeypatch.setattr("fenris.tui.datetime", _FrozenTuiDateTime)
         app = FenrisTuiApp(store_path=tmp_path / "test.db")
         async with app.run_test(size=(80, 24)) as pilot:
             await pilot.press("v", "v")