1 files changed, 11 insertions, 0 deletions
diff --git a/lib/sqlalchemy/test/util.py b/lib/sqlalchemy/test/util.py
index cd73b44d0..ff2c3d7b7 100644
--- a/lib/sqlalchemy/test/util.py
+++ b/lib/sqlalchemy/test/util.py
@@ -64,4 +64,15 @@ class RandomSet(set):
         self.remove(item)
         return item
         
+    def union(self, other):
+        return RandomSet(set.union(self, other))
+    
+    def difference(self, other):
+        return RandomSet(set.difference(self, other))
+        
+    def intersection(self, other):
+        return RandomSet(set.intersection(self, other))
+        
+    def copy(self):
+        return RandomSet(self)
         
 \ No newline at end of file