Tornado TestCase subclass that caches responses in memory. Useful when you need multiple test methods testing a single response and that response takes a long time to generate.

cached_testcase.py

import datetime as dt

from tornado.testing import AsyncHTTPTestCase


class CachedTestCase(AsyncHTTPTestCase):
    responses = {}

    def cache_response(self, key, response):
        self.responses[key] = {}
        self.responses[key]['response'] = response
        self.responses[key]['time'] = dt.datetime.now()

    def get_cached_url(self, path):
        if path not in self.responses.keys():
            self.http_client.fetch(self.get_url(path), self.stop)
            self.cache_response(path, self.wait(timeout=30))
        return self.responses[path]