feat: add declarative sing-box egress control plane

tests/test_cli.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+import contextlib
+import io
+import unittest
+
+from vpn_egressctl.cli import _parser
+
+
+class CliTests(unittest.TestCase):
+    def test_uri_positional_argument_is_rejected(self) -> None:
+        with contextlib.redirect_stderr(io.StringIO()), self.assertRaises(SystemExit):
+            _parser().parse_args(["import", "hysteria2://secret@example.com"])
+
+    def test_render_requires_output(self) -> None:
+        with contextlib.redirect_stderr(io.StringIO()), self.assertRaises(SystemExit):
+            _parser().parse_args(["render"])
+
+    def test_all_commands_parse(self) -> None:
+        for command in ("check", "diff", "sync", "status", "doctor", "rollback"):
+            with self.subTest(command=command):
+                args = _parser().parse_args([command])
+                self.assertEqual(args.command, command)
+
+
+if __name__ == "__main__":
+    unittest.main()