diff --git a/tests/util/caches/test_descriptors.py b/tests/util/caches/test_descriptors.py
index 4414e86771..3f14ab503f 100644
--- a/tests/util/caches/test_descriptors.py
+++ b/tests/util/caches/test_descriptors.py
@@ -175,3 +175,41 @@ class DescriptorTestCase(unittest.TestCase):
logcontext.LoggingContext.sentinel)
return d1
+
+ @defer.inlineCallbacks
+ def test_cache_default_args(self):
+ class Cls(object):
+ def __init__(self):
+ self.mock = mock.Mock()
+
+ @descriptors.cached()
+ def fn(self, arg1, arg2=2, arg3=3):
+ return self.mock(arg1, arg2, arg3)
+
+ obj = Cls()
+
+ obj.mock.return_value = 'fish'
+ r = yield obj.fn(1, 2, 3)
+ self.assertEqual(r, 'fish')
+ obj.mock.assert_called_once_with(1, 2, 3)
+ obj.mock.reset_mock()
+
+ # a call with same params shouldn't call the mock again
+ r = yield obj.fn(1, 2)
+ self.assertEqual(r, 'fish')
+ obj.mock.assert_not_called()
+ obj.mock.reset_mock()
+
+ # a call with different params should call the mock again
+ obj.mock.return_value = 'chips'
+ r = yield obj.fn(2, 3)
+ self.assertEqual(r, 'chips')
+ obj.mock.assert_called_once_with(2, 3, 3)
+ obj.mock.reset_mock()
+
+ # the two values should now be cached
+ r = yield obj.fn(1, 2)
+ self.assertEqual(r, 'fish')
+ r = yield obj.fn(2, 3)
+ self.assertEqual(r, 'chips')
+ obj.mock.assert_not_called()
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