How to use the httprunner.exceptions.FileNotFound function in httprunner

def test_load_testcases_bad_filepath(self):
        testcase_file_path = os.path.join(os.getcwd(), 'tests/data/demo')
        with self.assertRaises(exceptions.FileNotFound):
            load.load_file(testcase_file_path)

def test_load_tests_path_not_exist(self):
        # absolute folder path
        path = os.path.join(os.getcwd(), 'tests/data_not_exist')
        with self.assertRaises(exceptions.FileNotFound):
            loader.load_cases(path)

        # relative folder path
        path = 'tests/data_not_exist'
        with self.assertRaises(exceptions.FileNotFound):
            loader.load_cases(path)

def prepare_path(path):
        if not os.path.exists(path):
            err_msg = f"path not exist: {path}"
            logger.error(err_msg)
            raise exceptions.FileNotFound(err_msg)

        if not os.path.isabs(path):
            path = os.path.join(os.getcwd(), path)

        return path

file_name (str): target locate file name
        start_path (str): start locating path, maybe file path or directory path

    Returns:
        str: located file path. None if file not found.

    Raises:
        exceptions.FileNotFound: If failed to locate file.

    """
    if os.path.isfile(start_path):
        start_dir_path = os.path.dirname(start_path)
    elif os.path.isdir(start_path):
        start_dir_path = start_path
    else:
        raise exceptions.FileNotFound(f"invalid path: {start_path}")

    file_path = os.path.join(start_dir_path, file_name)
    if os.path.isfile(file_path):
        # ensure absolute
        return os.path.abspath(file_path)

    # system root dir
    # Windows, e.g. 'E:\\'
    # Linux/Darwin, '/'
    parent_dir = os.path.dirname(start_dir_path)
    if parent_dir == start_dir_path:
        raise exceptions.FileNotFound(f"{file_name} not found in {start_path}")

    # locate recursive upward
    return locate_file(parent_dir, file_name)

def load_file(file_path):
    if not os.path.isfile(file_path):
        raise exceptions.FileNotFound(f"{file_path} does not exist.")

    file_suffix = os.path.splitext(file_path)[1].lower()
    if file_suffix == ".json":
        return _load_json_file(file_path)
    elif file_suffix in [".yaml", ".yml"]:
        return _load_yaml_file(file_path)
    elif file_suffix == ".csv":
        return load_csv_file(file_path)
    else:
        # '' or other suffix
        logger.warning(f"Unsupported file format: {file_path}")
        return []

def prepare_path(path):
        if not os.path.exists(path):
            err_msg = f"path not exist: {path}"
            logger.error(err_msg)
            raise exceptions.FileNotFound(err_msg)

        if not os.path.isabs(path):
            path = os.path.join(os.getcwd(), path)

        return path

def load_test_file(test_file: Text) -> Dict:
    """load testcase/testsuite file content"""
    if not os.path.isfile(test_file):
        raise exceptions.FileNotFound(f"test file not exists: {test_file}")

    file_suffix = os.path.splitext(test_file)[1].lower()
    if file_suffix == ".json":
        test_file_content = _load_json_file(test_file)
    elif file_suffix in [".yaml", ".yml"]:
        test_file_content = _load_yaml_file(test_file)
    else:
        # '' or other suffix
        raise exceptions.FileFormatError(
            f"testcase/testsuite file should be YAML/JSON format, invalid format file: {test_file}"
        )

    return test_file_content