dnscms: upgrade to wagtail 8 and django 6.1, test upgrade-sensitive admin surfaces

dnscms/tests/test_admin_views.py

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+"""Admin view tests: the choose-parent redirect and a smoke test over the
+admin URLs served by our viewsets."""
+
+from urllib.parse import parse_qs, urlparse
+
+import pytest
+from django.urls import reverse
+
+from tests.conftest import EventIndexFactory, GenericPageFactory
+
+
+def _parsed(response):
+    url = urlparse(response["Location"])
+    return url.path, parse_qs(url.query)
+
+
+def test_choose_parent_no_valid_parent_renders_form(admin_client, db):
+    response = admin_client.get(reverse("events:choose_parent"))
+    assert response.status_code == 200
+
+
+def test_choose_parent_single_parent_redirects_with_next(admin_client, event_index):
+    response = admin_client.get(reverse("events:choose_parent"))
+
+    assert response.status_code == 302
+    path, query = _parsed(response)
+    assert path == reverse("wagtailadmin_pages:add", args=["events", "eventpage", event_index.pk])
+    assert query["next"] == [reverse("events:index")]
+
+
+def test_choose_parent_multiple_parents_shows_form_then_redirects(admin_client, event_index):
+    # max_count=1 stops a second EventIndex being created through the admin,
+    # but the view logic only cares how many instances exist.
+    second_index = EventIndexFactory(parent=event_index.get_parent(), slug="events-2")
+
+    response = admin_client.get(reverse("events:choose_parent"))
+    assert response.status_code == 200
+
+    response = admin_client.post(reverse("events:choose_parent"), {"parent_page": second_index.pk})
+    assert response.status_code == 302
+    path, query = _parsed(response)
+    assert path == reverse("wagtailadmin_pages:add", args=["events", "eventpage", second_index.pk])
+    assert query["next"] == [reverse("events:index")]
+
+
+@pytest.mark.parametrize(
+    "url_name",
+    [
+        "wagtailadmin_home",
+        "events:index",
+        "events:choose_parent",
+        "associations:index",
+        "news:index",
+        "venues:index",
+        "wagtailimages:index",
+        "wagtailsnippets_events_eventorganizer:list",
+        "association_chooser:choose",
+        "event_organizer_chooser:choose",
+    ],
+)
+def test_admin_views_render(admin_client, db, url_name):
+    response = admin_client.get(reverse(url_name))
+    assert response.status_code == 200
+
+
+def test_page_edit_view_renders_with_custom_editor_assets(admin_client, home_page):
+    """The page editor must load with our Draftail feature and editor JS wired in."""
+    page = GenericPageFactory(parent=home_page, slug="edit-me")
+
+    response = admin_client.get(reverse("wagtailadmin_pages:edit", args=[page.pk]))
+
+    assert response.status_code == 200
+    content = response.content.decode()
+    assert "button-link" in content  # dnscms.rich_text feature on the editor
+    assert "js/page-editor.js" in content  # insert_editor_js hook output