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1# Check every path through every method of UserList
2
3from collections import UserList
4from test import list_tests
5import unittest
6from test import support
7
8
9class UserListTest(list_tests.CommonTest):
10    type2test = UserList
11
12    def test_getslice(self):
13        super().test_getslice()
14        l = [0, 1, 2, 3, 4]
15        u = self.type2test(l)
16        for i in range(-3, 6):
17            self.assertEqual(u[:i], l[:i])
18            self.assertEqual(u[i:], l[i:])
19            for j in range(-3, 6):
20                self.assertEqual(u[i:j], l[i:j])
21
22    def test_slice_type(self):
23        l = [0, 1, 2, 3, 4]
24        u = UserList(l)
25        self.assertIsInstance(u[:], u.__class__)
26        self.assertEqual(u[:],u)
27
28    def test_add_specials(self):
29        u = UserList("spam")
30        u2 = u + "eggs"
31        self.assertEqual(u2, list("spameggs"))
32
33    def test_radd_specials(self):
34        u = UserList("eggs")
35        u2 = "spam" + u
36        self.assertEqual(u2, list("spameggs"))
37        u2 = u.__radd__(UserList("spam"))
38        self.assertEqual(u2, list("spameggs"))
39
40    def test_iadd(self):
41        super().test_iadd()
42        u = [0, 1]
43        u += UserList([0, 1])
44        self.assertEqual(u, [0, 1, 0, 1])
45
46    def test_mixedcmp(self):
47        u = self.type2test([0, 1])
48        self.assertEqual(u, [0, 1])
49        self.assertNotEqual(u, [0])
50        self.assertNotEqual(u, [0, 2])
51
52    def test_mixedadd(self):
53        u = self.type2test([0, 1])
54        self.assertEqual(u + [], u)
55        self.assertEqual(u + [2], [0, 1, 2])
56
57    def test_getitemoverwriteiter(self):
58        # Verify that __getitem__ overrides *are* recognized by __iter__
59        class T(self.type2test):
60            def __getitem__(self, key):
61                return str(key) + '!!!'
62        self.assertEqual(next(iter(T((1,2)))), "0!!!")
63
64    def test_userlist_copy(self):
65        u = self.type2test([6, 8, 1, 9, 1])
66        v = u.copy()
67        self.assertEqual(u, v)
68        self.assertEqual(type(u), type(v))
69
70    # Decorate existing test with recursion limit, because
71    # the test is for C structure, but `UserList` is a Python structure.
72    test_repr_deep = support.infinite_recursion(25)(
73        list_tests.CommonTest.test_repr_deep,
74    )
75
76if __name__ == "__main__":
77    unittest.main()
78