test_dictviews: Add testcase for dictviews_sub (GH-16660)

e53c5800 · Dong-hee Na · Serhiy Storchaka · 10cd00a9 · e53c5800
Commit e53c5800 authored Oct 09, 2019 by Dong-hee Na Committed by Serhiy Storchaka Oct 08, 2019
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Lib/test/test_dictviews.py Lib/test/test_dictviews.py +2 -0

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--- a/Lib/test/test_dictviews.py
+++ b/Lib/test/test_dictviews.py
@@ -219,11 +219,13 @@ class DictSetTest(unittest.TestCase):
        self.assertEqual(origin.keys() & iter([1, 2]), {1})
        self.assertEqual(origin.keys() | iter([1, 2]), {1, 2, 3})
        self.assertEqual(origin.keys() ^ iter([1, 2]), {2, 3})
+        self.assertEqual(origin.keys() - iter([1, 2]), {3})

        items = origin.items()
        self.assertEqual(items & iter([(1, 2)]), {(1, 2)})
        self.assertEqual(items ^ iter([(1, 2)]), {(3, 4)})
        self.assertEqual(items | iter([(1, 2)]), {(1, 2), (3, 4)})
+        self.assertEqual(items - iter([(1, 2)]), {(3, 4)})

    def test_recursive_repr(self):
        d = {}