summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_list.py
blob: 3b94700bb9e3dc6de77fcdb5df81a30617b271d2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
import sys
from test import support, list_tests
import pickle

class ListTest(list_tests.CommonTest):
    type2test = list

    def test_basic(self):
        self.assertEqual(list([]), [])
        l0_3 = [0, 1, 2, 3]
        l0_3_bis = list(l0_3)
        self.assertEqual(l0_3, l0_3_bis)
        self.assertTrue(l0_3 is not l0_3_bis)
        self.assertEqual(list(()), [])
        self.assertEqual(list((0, 1, 2, 3)), [0, 1, 2, 3])
        self.assertEqual(list(''), [])
        self.assertEqual(list('spam'), ['s', 'p', 'a', 'm'])

        if sys.maxsize == 0x7fffffff:
            # This test can currently only work on 32-bit machines.
            # XXX If/when PySequence_Length() returns a ssize_t, it should be
            # XXX re-enabled.
            # Verify clearing of bug #556025.
            # This assumes that the max data size (sys.maxint) == max
            # address size this also assumes that the address size is at
            # least 4 bytes with 8 byte addresses, the bug is not well
            # tested
            #
            # Note: This test is expected to SEGV under Cygwin 1.3.12 or
            # earlier due to a newlib bug.  See the following mailing list
            # thread for the details:

            #     http://sources.redhat.com/ml/newlib/2002/msg00369.html
            self.assertRaises(MemoryError, list, range(sys.maxsize // 2))

        # This code used to segfault in Py2.4a3
        x = []
        x.extend(-y for y in x)
        self.assertEqual(x, [])

    def test_truth(self):
        super().test_truth()
        self.assertTrue(not [])
        self.assertTrue([42])

    def test_identity(self):
        self.assertTrue([] is not [])

    def test_len(self):
        super().test_len()
        self.assertEqual(len([]), 0)
        self.assertEqual(len([0]), 1)
        self.assertEqual(len([0, 1, 2]), 3)

    def test_overflow(self):
        lst = [4, 5, 6, 7]
        n = int((sys.maxsize*2+2) // len(lst))
        def mul(a, b): return a * b
        def imul(a, b): a *= b
        self.assertRaises((MemoryError, OverflowError), mul, lst, n)
        self.assertRaises((MemoryError, OverflowError), imul, lst, n)

    def test_repr_large(self):
        # Check the repr of large list objects
        def check(n):
            l = [0] * n
            s = repr(l)
            self.assertEqual(s,
                '[' + ', '.join(['0'] * n) + ']')
        check(10)       # check our checking code
        check(1000000)

    def test_iterator_pickle(self):
        # Userlist iterators don't support pickling yet since
        # they are based on generators.
        data = self.type2test([4, 5, 6, 7])
        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            it = itorg = iter(data)
            d = pickle.dumps(it, proto)
            it = pickle.loads(d)
            self.assertEqual(type(itorg), type(it))
            self.assertEqual(self.type2test(it), self.type2test(data))

            it = pickle.loads(d)
            next(it)
            d = pickle.dumps(it, proto)
            self.assertEqual(self.type2test(it), self.type2test(data)[1:])

    def test_reversed_pickle(self):
        data = self.type2test([4, 5, 6, 7])
        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            it = itorg = reversed(data)
            d = pickle.dumps(it, proto)
            it = pickle.loads(d)
            self.assertEqual(type(itorg), type(it))
            self.assertEqual(self.type2test(it), self.type2test(reversed(data)))

            it = pickle.loads(d)
            next(it)
            d = pickle.dumps(it, proto)
            self.assertEqual(self.type2test(it), self.type2test(reversed(data))[1:])

    def test_no_comdat_folding(self):
        # Issue 8847: In the PGO build, the MSVC linker's COMDAT folding
        # optimization causes failures in code that relies on distinct
        # function addresses.
        class L(list): pass
        with self.assertRaises(TypeError):
            (3,) + L([1,2])

def test_main(verbose=None):
    support.run_unittest(ListTest)

    # verify reference counting
    import sys
    if verbose and hasattr(sys, "gettotalrefcount"):
        import gc
        counts = [None] * 5
        for i in range(len(counts)):
            support.run_unittest(ListTest)
            gc.collect()
            counts[i] = sys.gettotalrefcount()
        print(counts)


if __name__ == "__main__":
    test_main(verbose=True)