def setUp(self):
        """Sets up test environment before each test case."""
        self.mock_client = MockGitbookClient("fake_token")
        self.reader = SimpleGitbookReader(api_token="fake_token")
        self.reader.client = self.mock_client
Sets up test environment before each test case.
llama-index-integrations/readers/llama-index-readers-gitbook/tests/test_simple_gitbook_reader.py