In between commit domain restruturing

tests/integration/test_domain_uniqueness.py

@@ -0,0 +1,55 @@
+import unittest
+import yaml
+import subprocess
+from pathlib import Path
+from collections import Counter
+
+class TestDomainUniqueness(unittest.TestCase):
+    def test_no_duplicate_domains(self):
+        """
+        Load the applications YAML (generating it via `make build` if missing),
+        collect all entries under domains.canonical and domains.aliases across all applications,
+        and assert that no domain appears more than once.
+        """
+        repo_root = Path(__file__).resolve().parents[2]
+        yaml_file = repo_root / 'group_vars' / 'all' / '03_applications.yml'
+
+        # Generate the file if it doesn't exist
+        if not yaml_file.exists():
+            subprocess.run(['make', 'build'], cwd=repo_root, check=True)
+
+        # Load the applications configuration
+        cfg = yaml.safe_load(yaml_file.read_text(encoding='utf-8')) or {}
+        apps = cfg.get('defaults_applications', {})
+
+        all_domains = []
+        for app_name, app_cfg in apps.items():
+            domains_cfg = app_cfg.get('domains', {})
+
+            # canonical entries may be a list or a mapping
+            canonical = domains_cfg.get('canonical', [])
+            if isinstance(canonical, dict):
+                values = list(canonical.values())
+            else:
+                values = canonical or []
+            all_domains.extend(values)
+
+            # aliases entries may be a list or a mapping
+            aliases = domains_cfg.get('aliases', [])
+            if isinstance(aliases, dict):
+                values = list(aliases.values())
+            else:
+                values = aliases or []
+            all_domains.extend(values)
+
+        # Filter out any empty or non-string entries
+        domain_list = [d for d in all_domains if isinstance(d, str) and d.strip()]
+        counts = Counter(domain_list)
+
+        # Find duplicates
+        duplicates = [domain for domain, count in counts.items() if count > 1]
+        if duplicates:
+            self.fail(f"Duplicate domain entries found: {duplicates}\n (May 'make build' solves this issue.)")
+
+if __name__ == "__main__":
+    unittest.main()