FIX: cache test

unittests/test_update_cache.py

@@ -42,8 +42,8 @@ class CacheTest(unittest.TestCase):
         return c
 
     def setUp(self):
-        self.cache = UpdateCache(db_file=NamedTemporaryFile(delete=False).name)
-        self.cache.create_cache()
+        self.cache = UpdateCache(db_file=NamedTemporaryFile(delete=False).name,
+                                 force_creation=True)
         self.run_id = "235234"
 
     def test_insert(self):