feat(cli/build/defaults): ensure deterministic alphabetical sorting for applications and users

- Added sorting by application key and user key before YAML output.
- Ensures stable and reproducible file generation across runs.
- Added comprehensive unit tests verifying key order and output stability.

See: https://chatgpt.com/share/68ef4778-a848-800f-a50b-a46a3b878797

tests/unit/cli/build/defaults/test_applications.py

@@ -108,6 +108,89 @@ class TestGenerateDefaultApplications(unittest.TestCase):
         self.assertIn("nocfgdirapp", apps)
         self.assertEqual(apps["nocfgdirapp"], {})
 
+    def test_applications_sorted_by_key(self):
+        """
+        Ensure that defaults_applications keys are written in alphabetical order.
+        """
+        # Create several roles in non-sorted order
+        for name, cfg in [
+            ("web-app-zeta",  {"vars_id": "zeta",  "cfg": "z: 1\n"}),
+            ("web-app-alpha", {"vars_id": "alpha", "cfg": "a: 1\n"}),
+            ("web-app-mu",    {"vars_id": "mu",    "cfg": "m: 1\n"}),
+        ]:
+            role = self.roles_dir / name
+            (role / "vars").mkdir(parents=True, exist_ok=True)
+            (role / "config").mkdir(parents=True, exist_ok=True)
+            (role / "vars" / "main.yml").write_text(f"application_id: {cfg['vars_id']}\n")
+            (role / "config" / "main.yml").write_text(cfg["cfg"])
+
+        # Run generator
+        result = subprocess.run(
+            ["python3", str(self.script_path),
+            "--roles-dir", str(self.roles_dir),
+            "--output-file", str(self.output_file)],
+            capture_output=True, text=True
+        )
+        self.assertEqual(result.returncode, 0, msg=result.stderr)
+
+        # Validate order of keys in YAML
+        data = yaml.safe_load(self.output_file.read_text())
+        apps = data.get("defaults_applications", {})
+        # dict preserves insertion order in Python 3.7+, PyYAML keeps document order
+        keys_in_file = list(apps.keys())
+
+        self.assertEqual(
+            keys_in_file,
+            sorted(keys_in_file),
+            msg=f"Applications are not sorted: {keys_in_file}"
+        )
+        # Sanity: all expected apps present
+        for app in ("alpha", "mu", "zeta", "testapp"):
+            self.assertIn(app, apps)
+
+
+    def test_sorting_is_stable_across_runs(self):
+        """
+        Running the generator multiple times yields identical content (stable sort).
+        """
+        # Create a couple more roles (unsorted)
+        for name, appid in [
+            ("web-app-beta", "beta"),
+            ("web-app-delta", "delta"),
+        ]:
+            role = self.roles_dir / name
+            (role / "vars").mkdir(parents=True, exist_ok=True)
+            (role / "config").mkdir(parents=True, exist_ok=True)
+            (role / "vars" / "main.yml").write_text(f"application_id: {appid}\n")
+            (role / "config" / "main.yml").write_text("key: value\n")
+
+        # First run
+        result1 = subprocess.run(
+            ["python3", str(self.script_path),
+            "--roles-dir", str(self.roles_dir),
+            "--output-file", str(self.output_file)],
+            capture_output=True, text=True
+        )
+        self.assertEqual(result1.returncode, 0, msg=result1.stderr)
+        content_run1 = self.output_file.read_text()
+
+        # Second run (simulate potential filesystem order differences by touching dirs)
+        for p in self.roles_dir.iterdir():
+            os.utime(p, None)
+
+        result2 = subprocess.run(
+            ["python3", str(self.script_path),
+            "--roles-dir", str(self.roles_dir),
+            "--output-file", str(self.output_file)],
+            capture_output=True, text=True
+        )
+        self.assertEqual(result2.returncode, 0, msg=result2.stderr)
+        content_run2 = self.output_file.read_text()
+
+        self.assertEqual(
+            content_run1, content_run2,
+            msg="Output differs between runs; sorting should be stable."
+        )
 
 if __name__ == "__main__":
     unittest.main()

tests/unit/cli/build/defaults/test_users.py

@@ -132,5 +132,122 @@ class TestGenerateUsers(unittest.TestCase):
         finally:
             shutil.rmtree(tmp)
 
+    def test_cli_users_sorted_by_key(self):
+        """
+        Ensure that default_users keys are written in alphabetical order.
+        """
+        import tempfile
+        import subprocess
+        from pathlib import Path
+
+        tmpdir = Path(tempfile.mkdtemp())
+        try:
+            roles_dir = tmpdir / "roles"
+            roles_dir.mkdir()
+
+            # Create multiple roles with users in unsorted order
+            for role, users_map in [
+                ("role-zeta",  {"zeta":  {"email": "z@ex"}}),
+                ("role-alpha", {"alpha": {"email": "a@ex"}}),
+                ("role-mu",    {"mu":    {"email": "m@ex"}}),
+                ("role-beta",  {"beta":  {"email": "b@ex"}}),
+            ]:
+                (roles_dir / role / "users").mkdir(parents=True, exist_ok=True)
+                with open(roles_dir / role / "users" / "main.yml", "w") as f:
+                    yaml.safe_dump({"users": users_map}, f)
+
+            out_file = tmpdir / "users.yml"
+
+            # Resolve script path like in other tests (relative to repo root)
+            script_path = Path(__file__).resolve().parents[5] / "cli" / "build" / "defaults" / "users.py"
+
+            # Run generator
+            result = subprocess.run(
+                ["python3", str(script_path),
+                "--roles-dir", str(roles_dir),
+                "--output", str(out_file)],
+                capture_output=True, text=True
+            )
+            self.assertEqual(result.returncode, 0, msg=result.stderr)
+            self.assertTrue(out_file.exists(), "Output file was not created.")
+
+            data = yaml.safe_load(out_file.read_text())
+            self.assertIn("default_users", data)
+            users_map = data["default_users"]
+            keys_in_file = list(users_map.keys())
+
+            # Expect alphabetical order
+            self.assertEqual(
+                keys_in_file, sorted(keys_in_file),
+                msg=f"Users are not sorted alphabetically: {keys_in_file}"
+            )
+            # Sanity: all expected keys present
+            for k in ["alpha", "beta", "mu", "zeta"]:
+                self.assertIn(k, users_map)
+
+        finally:
+            shutil.rmtree(tmpdir)
+
+
+    def test_cli_users_sorting_stable_across_runs(self):
+        """
+        Running the generator multiple times yields identical content (stable sort).
+        """
+        import tempfile
+        import subprocess
+        from pathlib import Path
+
+        tmpdir = Path(tempfile.mkdtemp())
+        try:
+            roles_dir = tmpdir / "roles"
+            roles_dir.mkdir()
+
+            # Unsorted creation order on purpose
+            cases = [
+                ("role-d", {"duser": {"email": "d@ex"}}),
+                ("role-a", {"auser": {"email": "a@ex"}}),
+                ("role-c", {"cuser": {"email": "c@ex"}}),
+                ("role-b", {"buser": {"email": "b@ex"}}),
+            ]
+            for role, users_map in cases:
+                (roles_dir / role / "users").mkdir(parents=True, exist_ok=True)
+                with open(roles_dir / role / "users" / "main.yml", "w") as f:
+                    yaml.safe_dump({"users": users_map}, f)
+
+            out_file = tmpdir / "users.yml"
+            script_path = Path(__file__).resolve().parents[5] / "cli" / "build" / "defaults" / "users.py"
+
+            # First run
+            r1 = subprocess.run(
+                ["python3", str(script_path),
+                "--roles-dir", str(roles_dir),
+                "--output", str(out_file)],
+                capture_output=True, text=True
+            )
+            self.assertEqual(r1.returncode, 0, msg=r1.stderr)
+            content1 = out_file.read_text()
+
+            # Touch dirs to shuffle filesystem mtimes
+            for p in roles_dir.iterdir():
+                os.utime(p, None)
+
+            # Second run
+            r2 = subprocess.run(
+                ["python3", str(script_path),
+                "--roles-dir", str(roles_dir),
+                "--output", str(out_file)],
+                capture_output=True, text=True
+            )
+            self.assertEqual(r2.returncode, 0, msg=r2.stderr)
+            content2 = out_file.read_text()
+
+            self.assertEqual(
+                content1, content2,
+                msg="Output differs between runs; user sorting should be stable."
+            )
+        finally:
+            shutil.rmtree(tmpdir)
+
+
 if __name__ == '__main__':
     unittest.main()