Fixed SortedDict.__copy__()

Fixed #18175 -- Calling SortedDict.__copy__() resulted in changes to
the original dictionary. The reason was likely related to subclassing
dict.

Thanks to linovia for report and patch.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/regressiontests/utils/datastructures.py b/tests/regressiontests/utils/datastructures.py
index d6db991007..000f7f76a1 100644
--- a/tests/regressiontests/utils/datastructures.py
+++ b/tests/regressiontests/utils/datastructures.py
@@ -111,6 +111,12 @@ class SortedDictTests(SimpleTestCase):
             {7: 'seven', 1: 'one', 9: 'nine'}
         )
 
+    def test_copy(self):
+        orig = SortedDict(((1, "one"), (0, "zero"), (2, "two")))
+        copied = copy.copy(orig)
+        self.assertEqual(orig.keys(), [1, 0, 2])
+        self.assertEqual(copied.keys(), [1, 0, 2])
+
     def test_clear(self):
         self.d1.clear()
         self.assertEqual(self.d1, {})