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-rw-r--r--Lib/test/seq_tests.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/Lib/test/seq_tests.py b/Lib/test/seq_tests.py
index f655c29..824ae01 100644
--- a/Lib/test/seq_tests.py
+++ b/Lib/test/seq_tests.py
@@ -361,6 +361,13 @@ class CommonTest(unittest.TestCase):
self.assertEqual(u.index(0, 3), 3)
self.assertEqual(u.index(0, 3, 4), 3)
self.assertRaises(ValueError, u.index, 2, 0, -10)
+ self.assertEqual(u.index(1, None), 4)
+ self.assertEqual(u.index(1, None, None), 4)
+ self.assertEqual(u.index(1, 0, None), 4)
+ self.assertEqual(u.index(1, None, 6), 4)
+ self.assertRaises(ValueError, u.index, -1, 3)
+ self.assertRaises(ValueError, u.index, -1, 3, None)
+ self.assertRaises(ValueError, u.index, 1, None, 4)
self.assertRaises(TypeError, u.index)