Finished backup update

tests/integration/test_roles_naming.py

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+import unittest
+import re
+from pathlib import Path
+
+# Regex:
+# - one or more lowercase letters, digits or hyphens
+# - optionally exactly one '_' followed by one or more lowercase letters, digits or hyphens
+ROLE_NAME_PATTERN = re.compile(r'^[a-z0-9-]+(?:_[a-z0-9-]+)?$')
+
+class TestRoleNames(unittest.TestCase):
+    def test_role_names_follow_naming_convention(self):
+        # go up from tests/integration/test_roles_naming.py to project root, then into roles/
+        roles_dir = Path(__file__).resolve().parents[2] / "roles"
+        self.assertTrue(
+            roles_dir.is_dir(),
+            f"'roles/' directory not found at {roles_dir}"
+        )
+
+        invalid_names = []
+        for role_path in roles_dir.iterdir():
+            if not role_path.is_dir():
+                # skip non-directories
+                continue
+
+            name = role_path.name
+            if not ROLE_NAME_PATTERN.fullmatch(name):
+                invalid_names.append(name)
+
+        self.assertFalse(
+            invalid_names,
+            "The following role directory names violate the naming convention "
+            "(only a–z, 0–9, '-', max one '_', and '_' must be followed by at least one character):\n"
+            + "\n".join(f"- {n}" for n in invalid_names)
+        )
+
+if __name__ == "__main__":
+    unittest.main()