fix apply subscription

tests/test_nightly_tasks.py

@@ -0,0 +1,56 @@
+import datetime
+
+from meal_manager.models import Event, Household, Subscription
+from meal_manager.scripts import apply_subscriptions
+
+
+def test_subscriptions(db_session):
+    now = datetime.datetime.now()
+    event1 = Event(
+        title="far future",
+        event_time=now + datetime.timedelta(days=8, hours=2),
+        registration_deadline=now + datetime.timedelta(days=3),
+        description="This event should not be proceesed.",
+    )
+    event2 = Event(
+        title="soon",
+        event_time=now + datetime.timedelta(days=7, hours=2),
+        registration_deadline=now + datetime.timedelta(days=2),
+        description="This event should be proceesed.",
+    )
+    ignore = Event(
+        title="ignore me",
+        event_time=now + datetime.timedelta(days=7, hours=2),
+        description=(
+            "This event should not be proceesed because it "
+            "has ignore_subscriptions set to True."
+        ),
+        registration_deadline=now + datetime.timedelta(days=2, hours=2),
+        ignore_subscriptions=True,
+    )
+    db_session.add(event1)
+    db_session.add(event2)
+    db_session.add(ignore)
+
+    db_session.add(Household(name="Klaus", id=1))
+    db_session.add(
+        Subscription(
+            household_id=1,
+            num_adult_meals=2,
+            num_children_meals=1,
+            num_small_children_meals=0,
+        )
+    )
+    db_session.commit()
+
+    assert not event1.subscriptions_applied
+    assert not event2.subscriptions_applied
+
+    apply_subscriptions(db_session)
+
+    assert len(event1.registrations) == 0
+    assert len(event2.registrations) == 1
+    assert len(ignore.registrations) == 0
+    assert not event1.subscriptions_applied
+    assert not ignore.subscriptions_applied
+    assert event2.subscriptions_applied