def parse(self, response):
    """ This function parses a sample response. Some contracts are mingled
    with this docstring.
    @url http://www.amazon.com/s?field-keywords=selfish+gene
    @returns items 1 16
    @returns requests 0 0
    @scrapes Title Author Year Price
    """
Создать юнит-тест для метода scrapy CrawlSpider