def test_get_ref_content(self):
        """Test that _get_ref_content returns the content from a valid ref."""
        # First commit the changes to make sure we have a valid ref
        self._execute_command('git add file1.txt', self.local_dir)
        self._execute_command("git commit -m 'Update file1.txt'", self.local_dir)

        # Get the content of file1.txt from the main branch
        content = self.git_handler._get_ref_content('file1.txt')
        self.assertEqual(content.strip(), 'Original content')
Test that _get_ref_content returns the content from a valid ref.
tests/unit/test_git_handler_real.py