Lib/test/test_list.py

   1 import sys
   2 from test import test_support, list_tests
   3
   4 class ListTest(list_tests.CommonTest):
   5     type2test = list
   6
   7     def test_basic(self):
   8         self.assertEqual(list([]), [])
   9         l0_3 = [0, 1, 2, 3]
  10         l0_3_bis = list(l0_3)
  11         self.assertEqual(l0_3, l0_3_bis)
  12         self.assertTrue(l0_3 is not l0_3_bis)
  13         self.assertEqual(list(()), [])
  14         self.assertEqual(list((0, 1, 2, 3)), [0, 1, 2, 3])
  15         self.assertEqual(list(''), [])
  16         self.assertEqual(list('spam'), ['s', 'p', 'a', 'm'])
  17
  18         if sys.maxsize == 0x7fffffff:
  19             # This test can currently only work on 32-bit machines.
  20             # XXX If/when PySequence_Length() returns a ssize_t, it should be
  21             # XXX re-enabled.
  22             # Verify clearing of bug #556025.
  23             # This assumes that the max data size (sys.maxint) == max
  24             # address size this also assumes that the address size is at
  25             # least 4 bytes with 8 byte addresses, the bug is not well
  26             # tested
  27             #
  28             # Note: This test is expected to SEGV under Cygwin 1.3.12 or
  29             # earlier due to a newlib bug.  See the following mailing list
  30             # thread for the details:
  31
  32             #     http://sources.redhat.com/ml/newlib/2002/msg00369.html
  33             self.assertRaises(MemoryError, list, xrange(sys.maxint // 2))
  34
  35         # This code used to segfault in Py2.4a3
  36         x = []
  37         x.extend(-y for y in x)
  38         self.assertEqual(x, [])
  39
  40     def test_truth(self):
  41         super(ListTest, self).test_truth()
  42         self.assertTrue(not [])
  43         self.assertTrue([42])
  44
  45     def test_identity(self):
  46         self.assertTrue([] is not [])
  47
  48     def test_len(self):
  49         super(ListTest, self).test_len()
  50         self.assertEqual(len([]), 0)
  51         self.assertEqual(len([0]), 1)
  52         self.assertEqual(len([0, 1, 2]), 3)
  53
  54     def test_overflow(self):
  55         lst = [4, 5, 6, 7]
  56         n = int((sys.maxint*2+2) // len(lst))
  57         def mul(a, b): return a * b
  58         def imul(a, b): a *= b
  59         self.assertRaises((MemoryError, OverflowError), mul, lst, n)
  60         self.assertRaises((MemoryError, OverflowError), imul, lst, n)
  61
  62 def test_main(verbose=None):
  63     test_support.run_unittest(ListTest)
  64
  65     # verify reference counting
  66     import sys
  67     if verbose and hasattr(sys, "gettotalrefcount"):
  68         import gc
  69         counts = [None] * 5
  70         for i in xrange(len(counts)):
  71             test_support.run_unittest(ListTest)
  72             gc.collect()
  73             counts[i] = sys.gettotalrefcount()
  74         print counts
  75
  76
  77 if __name__ == "__main__":
  78     test_main(verbose=True)