Issues #1621, #29145: Test for str.join() overflow

b71c0956 · Martin Panter · 52e29072 · b71c0956
Commit b71c0956 authored Jan 12, 2017 by Martin Panter
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Lib/test/test_unicode.py Lib/test/test_unicode.py +7 -0

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--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -464,6 +464,13 @@ class UnicodeTest(string_tests.CommonTest,
        self.checkraises(TypeError, ' ', 'join', [1, 2, 3])
        self.checkraises(TypeError, ' ', 'join', ['1', '2', 3])

+    @unittest.skipIf(sys.maxsize > 2**32,
+        'needs too much memory on a 64-bit platform')
+    def test_join_overflow(self):
+        size = int(sys.maxsize**0.5) + 1
+        seq = ('A' * size,) * size
+        self.assertRaises(OverflowError, ''.join, seq)
+
    def test_replace(self):
        string_tests.CommonTest.test_replace(self)