commit e19aa388e8f4aa88ef5e2a25444a06c2ec3408ad
author Antoine Pitrou <solipsis@pitrou.net> Tue Oct 04 16:04:01 2011 +0200
committer Antoine Pitrou <solipsis@pitrou.net> Tue Oct 04 16:04:01 2011 +0200
tree 886ac4e41e392672b8a2cea8c5ff11f85e7df58c
parent 87a484caf556f0542ddf053fa4f87859cf59de44

When expandtabs() would be a no-op, don't create a duplicate string

Lib/test/test_unicode.py

diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 4f6f132..840b76f 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -1585,6 +1585,10 @@
             return
         self.assertRaises(OverflowError, 't\tt\t'.expandtabs, sys.maxsize)
 
+    def test_expandtabs_optimization(self):
+        s = 'abc'
+        self.assertIs(s.expandtabs(), s)
+
     def test_raiseMemError(self):
         if struct.calcsize('P') == 8:
             # 64 bits pointers