Fix 'LruCache' object has no attribute '_on_resize' (#8591)

We need to make sure we are readu for the `set_cache_factor` callback.

1 files changed, 7 insertions, 1 deletions

diff --git a/tests/util/test_lrucache.py b/tests/util/test_lrucache.py

index f12834edab..a739a6aaaf 100644
--- a/tests/util/test_lrucache.py
+++ b/tests/util/test_lrucache.py
@@ -19,7 +19,8 @@ from mock import Mock
 from synapse.util.caches.lrucache import LruCache
 from synapse.util.caches.treecache import TreeCache
 
-from .. import unittest
+from tests import unittest
+from tests.unittest import override_config
 
 
 class LruCacheTestCase(unittest.HomeserverTestCase):
@@ -83,6 +84,11 @@ class LruCacheTestCase(unittest.HomeserverTestCase):
         cache.clear()
         self.assertEquals(len(cache), 0)
 
+    @override_config({"caches": {"per_cache_factors": {"mycache": 10}}})
+    def test_special_size(self):
+        cache = LruCache(10, "mycache")
+        self.assertEqual(cache.max_size, 100)
+
 
 class LruCacheCallbacksTestCase(unittest.HomeserverTestCase):
     def test_get(self):