dnscms: add pytest-cov

dnscms/pyproject.toml

@@ -18,6 +18,7 @@ dependencies = [
 dev = [
     "ruff>=0.15.13,<0.16",
     "pytest>=9.0.3,<10",
+    "pytest-cov>=7.0.0,<8",
     "pytest-django>=4.12.0,<5",
     "wagtail-factories>=4.4.0,<5",
 ]
@@ -41,3 +42,14 @@ exclude = ["**/migrations/*.py"]
 DJANGO_SETTINGS_MODULE = "dnscms.settings.test"
 python_files = ["test_*.py"]
 testpaths = ["tests"]
+addopts = "--cov=. --cov-report=term-missing"
+
+[tool.coverage.run]
+omit = [
+    "*/migrations/*",
+    "tests/*",
+    "manage.py",
+    "dnscms/settings/*",
+    "dnscms/wsgi.py",
+    "dnscms/asgi.py",
+]