':rtype: str'

def find_docs(self):

    testing_docs_url = 'https://docs.ansible.com/ansible/devel/dev_guide/testing'
    testing_docs_dir = 'docs/docsite/rst/dev_guide/testing'
    url = ('%s/%s/' % (testing_docs_url, self.command))
    path = os.path.join(testing_docs_dir, self.command)
    if self.test:
        url += ('%s.html' % self.test)
        path = os.path.join(path, ('%s.rst' % self.test))
    if os.path.exists(path):
        return url
    return None
