test: Add test for git config include to verify aider respects user settings

tests/basic/test_main.py

@@ -740,6 +740,35 @@ class TestMain(TestCase):
         with GitTemporaryDirectory():
             result = main(["--api-key", "INVALID_FORMAT", "--exit", "--yes"])
             self.assertEqual(result, 1)
+            
+    def test_git_config_include(self):
+        # Test that aider respects git config includes for user.name and user.email
+        with GitTemporaryDirectory() as git_dir:
+            git_dir = Path(git_dir)
+            
+            # Create an includable config file with user settings
+            include_config = git_dir / "included.gitconfig"
+            include_config.write_text(
+                "[user]\n"
+                "    name = Included User\n"
+                "    email = included@example.com\n"
+            )
+            
+            # Set up main git config to include the other file
+            repo = git.Repo(git_dir)
+            repo.git.config("--local", "include.path", str(include_config))
+            
+            # Verify the config is set up correctly
+            self.assertEqual(repo.git.config("user.name"), "Included User")
+            self.assertEqual(repo.git.config("user.email"), "included@example.com")
+            
+            # Run aider and verify it doesn't change the git config
+            main(["--yes", "--exit"], input=DummyInput(), output=DummyOutput())
+            
+            # Check that the user settings are still the same
+            repo = git.Repo(git_dir)  # Re-open repo to ensure we get fresh config
+            self.assertEqual(repo.git.config("user.name"), "Included User")
+            self.assertEqual(repo.git.config("user.email"), "included@example.com")
 
     def test_invalid_edit_format(self):
         with GitTemporaryDirectory():