flask: render: get tests working

app.py

@@ -11,7 +11,6 @@ for module in (
   'add_webmention',
   'logs',
   'redirect',
-  'render',
   'salmon',
   'superfeedr',
   'webfinger',

render.py

@@ -20,10 +20,13 @@ app.wsgi_app = handlers.ndb_context_middleware(
 cache = Cache(app)
 
 
+def not_5xx(resp):
+    return isinstance(resp, tuple) and resp[1] // 100 != 5
+
+
 @app.route('/render')
 @cache.cached(timeout=CACHE_TIME.total_seconds(), query_string=True,
-              # don't cache 5xxes
-              response_filter=lambda resp: resp[1] // 100 != 5)
+              response_filter=not_5xx)
 def render():
     source = common.get_required_param(request, 'source')
     target = common.get_required_param(request, 'target')

tests/test_render.py

@@ -3,7 +3,7 @@
 from oauth_dropins.webutil.util import json_dumps
 
 from models import Response
-from render import app
+from render import app, cache
 from . import testutil
 
 client = app.test_client()
@@ -13,8 +13,7 @@ class RenderTest(testutil.TestCase):
 
     def setUp(self):
         super(RenderTest, self).setUp()
-        app.config['TESTING'] = True
-
+        cache.clear()
         self.as2 = {
             '@context': 'https://www.w3.org/ns/activitystreams',
             'type': 'Note',