1 files changed, 73 insertions, 1 deletions
diff --git a/tests/storage/test__base.py b/tests/storage/test__base.py
index 55d22f665a..96caf8c4c1 100644
--- a/tests/storage/test__base.py
+++ b/tests/storage/test__base.py
@@ -17,7 +17,79 @@
 from tests import unittest
 from twisted.internet import defer
 
-from synapse.storage._base import cached
+from synapse.storage._base import Cache, cached
+
+
+class CacheTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.cache = Cache("test")
+
+    def test_empty(self):
+        failed = False
+        try:
+            self.cache.get("foo")
+        except KeyError:
+            failed = True
+
+        self.assertTrue(failed)
+
+    def test_hit(self):
+        self.cache.prefill("foo", 123)
+
+        self.assertEquals(self.cache.get("foo"), 123)
+
+    def test_invalidate(self):
+        self.cache.prefill("foo", 123)
+        self.cache.invalidate("foo")
+
+        failed = False
+        try:
+            self.cache.get("foo")
+        except KeyError:
+            failed = True
+
+        self.assertTrue(failed)
+
+    def test_eviction(self):
+        cache = Cache("test", max_entries=2)
+
+        cache.prefill(1, "one")
+        cache.prefill(2, "two")
+        cache.prefill(3, "three")  # 1 will be evicted
+
+        failed = False
+        try:
+            cache.get(1)
+        except KeyError:
+            failed = True
+
+        self.assertTrue(failed)
+
+        cache.get(2)
+        cache.get(3)
+
+    def test_eviction_lru(self):
+        cache = Cache("test", max_entries=2, lru=True)
+
+        cache.prefill(1, "one")
+        cache.prefill(2, "two")
+
+        # Now access 1 again, thus causing 2 to be least-recently used
+        cache.get(1)
+
+        cache.prefill(3, "three")
+
+        failed = False
+        try:
+            cache.get(2)
+        except KeyError:
+            failed = True
+
+        self.assertTrue(failed)
+
+        cache.get(1)
+        cache.get(3)
 
 
 class CacheDecoratorTestCase(unittest.TestCase):