test: migrate backend suites to pytest with module coverage gate

Split backend tests into unit and integration suites, add isolated fixtures and coverage enforcement, and update CI and test documentation. Cover current authentication, content, notification, payment, media, and admin flows; fix behaviors revealed by the new tests. Validate both suites and the per-module gate against local PostgreSQL.

apps/events/tests/integration/test_event_changes.py

@@ -0,0 +1,61 @@
+import json
+
+import pytest
+from django.core.files.uploadedfile import SimpleUploadedFile
+
+from apps.events.models import Event, Registration
+from apps.gallery.models import Gallery
+
+
+pytestmark = [pytest.mark.integration, pytest.mark.django_db]
+
+
+def _put(client, path, payload, headers):
+    return client.put(path, data=json.dumps(payload), content_type="application/json", **headers)
+
+
+def test_event_reschedule_and_cancellation_notify_registered_users(client, user_factory, auth_headers,
+                                                                    event_factory, mocker):
+    staff = user_factory(is_staff=True)
+    attendee = user_factory(is_mobile_verified=True)
+    event = event_factory()
+    Registration.objects.create(event=event, user=attendee, status=Registration.StatusChoices.CONFIRMED)
+    notify = mocker.patch("apps.events.api.views.notify_user")
+    sms = mocker.patch("apps.events.api.views.send_critical_sms.delay")
+    path = f"/api/events/{event.pk}"
+    assert _put(client, path, {"location": "New hall"}, auth_headers(attendee)).status_code == 403
+    changed = _put(client, path, {"location": "New hall"}, auth_headers(staff))
+    assert changed.status_code == 200, changed.content
+    event.refresh_from_db()
+    assert event.location == "New hall"
+    assert notify.call_args.args[1]["type"] == "event_rescheduled"
+    sms.assert_called_with(attendee.mobile, "event_reschedule", event.title)
+    cancelled = _put(client, path, {"status": Event.StatusChoices.CANCELLED}, auth_headers(staff))
+    assert cancelled.status_code == 200, cancelled.content
+    event.refresh_from_db()
+    assert event.status == Event.StatusChoices.CANCELLED
+    assert notify.call_args.args[1]["type"] == "event_cancelled"
+    assert sms.call_count == 2
+
+
+def test_event_gallery_upload_validation_and_removal(client, user_factory, auth_headers,
+                                                     event_factory, mocker, tmp_path, settings):
+    settings.MEDIA_ROOT = tmp_path
+    staff = user_factory(is_staff=True)
+    member = user_factory()
+    event = event_factory()
+    headers = auth_headers(staff)
+    path = f"/api/events/{event.pk}/gallery"
+    queued = mocker.patch("apps.events.api.views.process_uploaded_image.delay")
+    assert client.get(path, **auth_headers(member)).status_code == 403
+    invalid = client.post(path, {"file": SimpleUploadedFile("bad.txt", b"bad", content_type="text/plain")}, **headers)
+    assert invalid.status_code == 400
+    uploaded = client.post(path, {"file": SimpleUploadedFile("photo.png", b"image", content_type="image/png")}, **headers)
+    assert uploaded.status_code == 201, uploaded.content
+    image = Gallery.objects.get(pk=uploaded.json()["id"])
+    assert event.gallery_images.filter(pk=image.pk).exists()
+    queued.assert_called_once_with(image.pk)
+    assert client.get(path, **headers).json()[0]["id"] == image.pk
+    assert client.delete(f"{path}/{image.pk}", **headers).status_code == 200
+    assert not event.gallery_images.filter(pk=image.pk).exists()
+    assert Gallery.deleted_objects.filter(pk=image.pk).exists()