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/communications/tests/integration/test_api.py

@@ -0,0 +1,66 @@
+import json
+
+import pytest
+
+from apps.communications.models import Announcement, PushNotificationDevice
+
+
+pytestmark = [pytest.mark.integration, pytest.mark.django_db]
+
+
+def _send(client, method, path, headers, payload=None):
+    kwargs = dict(headers)
+    if payload is not None:
+        kwargs.update(data=json.dumps(payload), content_type="application/json")
+    return getattr(client, method)(path, **kwargs)
+
+
+def test_announcement_staff_crud_and_public_listing(client, user_factory, auth_headers):
+    staff = user_factory(is_staff=True)
+    member = user_factory()
+    staff_headers = auth_headers(staff)
+    member_headers = auth_headers(member)
+    payload = {"title": "Meeting", "content": "Welcome", "is_published": True}
+    assert _send(client, "post", "/api/communications/announcements/", member_headers, payload).status_code == 403
+    created = _send(client, "post", "/api/communications/announcements/", staff_headers, payload)
+    assert created.status_code == 200, created.content
+    item = Announcement.objects.get(title="Meeting")
+    listing = client.get("/api/communications/announcements/").json()
+    assert listing["items"][0]["id"] == item.id
+    assert client.get(f"/api/communications/announcements/{item.id}/").json()["title"] == "Meeting"
+    stats = _send(client, "get", "/api/communications/announcements/stats/", staff_headers)
+    assert stats.status_code == 200, stats.content
+    assert stats.json()["published_announcements"] == 1
+    updated = _send(client, "put", f"/api/communications/announcements/{item.id}/", staff_headers,
+                    {"title": "Revised", "content": "New", "is_published": False})
+    assert updated.status_code == 200, updated.content
+    item.refresh_from_db()
+    assert item.title == "Revised" and not item.is_published
+    assert client.get("/api/communications/announcements/").json()["items"] == []
+    deleted = _send(client, "delete", f"/api/communications/announcements/{item.id}/", staff_headers)
+    assert deleted.status_code == 200, deleted.content
+    assert Announcement.deleted_objects.filter(pk=item.pk).exists()
+
+
+def test_push_device_registration_update_and_removal(client, user_factory, auth_headers):
+    user = user_factory()
+    other = user_factory()
+    headers = auth_headers(user)
+    path = "/api/communications/push-devices/"
+    payload = {"device_token": "device-1", "device_type": "web"}
+    assert client.get(path).status_code == 401
+    first = _send(client, "post", path, headers, payload)
+    assert first.status_code == 200, first.content
+    device = PushNotificationDevice.objects.get(user=user, device_token="device-1")
+    device.is_active = False
+    device.save()
+    assert _send(client, "post", path, headers, payload).status_code == 200
+    device.refresh_from_db()
+    assert device.is_active
+    assert [row["id"] for row in _send(client, "get", path, headers).json()] == [device.id]
+    assert _send(client, "put", f"{path}{device.id}/", auth_headers(other), {"is_active": False}).status_code == 404
+    assert _send(client, "put", f"{path}{device.id}/", headers, {"is_active": False}).status_code == 200
+    device.refresh_from_db()
+    assert not device.is_active
+    assert _send(client, "delete", path + "?device_token=device-1", headers).status_code == 200
+    assert not PushNotificationDevice.objects.filter(pk=device.pk).exists()