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-rw-r--r--Lib/test/test_userdict.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/test/test_userdict.py b/Lib/test/test_userdict.py
index 49be8c6..0f2fbb8 100644
--- a/Lib/test/test_userdict.py
+++ b/Lib/test/test_userdict.py
@@ -75,6 +75,10 @@ m2 = MyUserDict(u2)
m2a = m2.copy()
verify(m2a == m2)
+# SF bug #476616 -- copy() of UserDict subclass shared data
+m2['foo'] = 'bar'
+verify(m2a != m2)
+
# Test keys, items, values
verify(u2.keys() == d2.keys())