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-rw-r--r--tests/util/test_treecache.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/tests/util/test_treecache.py b/tests/util/test_treecache.py
index bcc64422b2..7ab578a185 100644
--- a/tests/util/test_treecache.py
+++ b/tests/util/test_treecache.py
@@ -77,3 +77,9 @@ class TreeCacheTestCase(unittest.TestCase):
         cache[("b",)] = "B"
         cache.clear()
         self.assertEquals(len(cache), 0)
+
+    def test_contains(self):
+        cache = TreeCache()
+        cache[("a",)] = "A"
+        self.assertTrue(("a",) in cache)
+        self.assertFalse(("b",) in cache)