better test

tests/test_main.py

@@ -6,6 +6,7 @@ from pathlib import Path
 from unittest import TestCase
 from unittest.mock import patch
 
+import git
 from prompt_toolkit.input import DummyInput
 from prompt_toolkit.output import DummyOutput
 
@@ -77,6 +78,8 @@ class TestMain(TestCase):
         git_root = Path(git_root).resolve()
         self.assertEqual(git_root, Path(self.tempdir).resolve())
 
+        self.assertTrue(git.Repo(self.tempdir))
+
     def test_main_args(self):
         with patch("aider.main.Coder.create") as MockCoder:
             # --yes will just ok the git repo without blocking on input