Default interactive CLI to menu

tests/test_plugin_helper.py

@@ -4,6 +4,7 @@ import json
 import tempfile
 import unittest
 import os
+from io import StringIO
 from pathlib import Path
 from unittest.mock import patch
 from zipfile import ZipFile
@@ -180,6 +181,26 @@ state_dir = ".state"
             self.assertEqual(runtime.state_root, root / "explicit-state")
             self.assertEqual(runtime.selected_profile.id, "linux")
 
+    def test_no_args_prints_help_when_not_interactive(self) -> None:
+        output = StringIO()
+        with patch("sys.stdin.isatty", return_value=False), patch("sys.stdout", output):
+            status = run([])
+
+        self.assertEqual(status, 2)
+        self.assertIn("usage: plugin-helper", output.getvalue())
+        self.assertIn("menu", output.getvalue())
+
+    def test_no_command_defaults_to_menu_when_interactive(self) -> None:
+        with (
+            patch("sys.stdin.isatty", return_value=True),
+            patch("sys.stdout.isatty", return_value=True),
+            patch("plugin_helper.cli._run_menu", return_value=0) as run_menu,
+        ):
+            status = run(["--profile", "linux"])
+
+        self.assertEqual(status, 0)
+        run_menu.assert_called_once()
+
     def test_run_ipa_timeout_returns_control(self) -> None:
         with tempfile.TemporaryDirectory() as tmp:
             result = _run_ipa(