Lib/test/test_index.py

   1 import unittest
   2 from test import support
   3 import operator
   4 maxsize = support.MAX_Py_ssize_t
   5 minsize = -maxsize-1
   6
   7 class oldstyle:
   8     def __index__(self):
   9         return self.ind
  10
  11 class newstyle(object):
  12     def __index__(self):
  13         return self.ind
  14
  15 class TrapInt(int):
  16     def __index__(self):
  17         return self
  18
  19 class TrapLong(int):
  20     def __index__(self):
  21         return self
  22
  23 class BaseTestCase(unittest.TestCase):
  24     def setUp(self):
  25         self.o = oldstyle()
  26         self.n = newstyle()
  27
  28     def test_basic(self):
  29         self.o.ind = -2
  30         self.n.ind = 2
  31         self.assertEqual(operator.index(self.o), -2)
  32         self.assertEqual(operator.index(self.n), 2)
  33
  34     def test_slice(self):
  35         self.o.ind = 1
  36         self.n.ind = 2
  37         slc = slice(self.o, self.o, self.o)
  38         check_slc = slice(1, 1, 1)
  39         self.assertEqual(slc.indices(self.o), check_slc.indices(1))
  40         slc = slice(self.n, self.n, self.n)
  41         check_slc = slice(2, 2, 2)
  42         self.assertEqual(slc.indices(self.n), check_slc.indices(2))
  43
  44     def test_wrappers(self):
  45         self.o.ind = 4
  46         self.n.ind = 5
  47         self.assertEqual(6 .__index__(), 6)
  48         self.assertEqual(-7 .__index__(), -7)
  49         self.assertEqual(self.o.__index__(), 4)
  50         self.assertEqual(self.n.__index__(), 5)
  51
  52     def test_subclasses(self):
  53         r = list(range(10))
  54         self.assertEqual(r[TrapInt(5):TrapInt(10)], r[5:10])
  55         self.assertEqual(r[TrapLong(5):TrapLong(10)], r[5:10])
  56         self.assertEqual(slice(TrapInt()).indices(0), (0,0,1))
  57         self.assertEqual(slice(TrapLong(0)).indices(0), (0,0,1))
  58
  59     def test_error(self):
  60         self.o.ind = 'dumb'
  61         self.n.ind = 'bad'
  62         self.failUnlessRaises(TypeError, operator.index, self.o)
  63         self.failUnlessRaises(TypeError, operator.index, self.n)
  64         self.failUnlessRaises(TypeError, slice(self.o).indices, 0)
  65         self.failUnlessRaises(TypeError, slice(self.n).indices, 0)
  66
  67
  68 class SeqTestCase(unittest.TestCase):
  69     # This test case isn't run directly. It just defines common tests
  70     # to the different sequence types below
  71     def setUp(self):
  72         self.o = oldstyle()
  73         self.n = newstyle()
  74         self.o2 = oldstyle()
  75         self.n2 = newstyle()
  76
  77     def test_index(self):
  78         self.o.ind = -2
  79         self.n.ind = 2
  80         self.assertEqual(self.seq[self.n], self.seq[2])
  81         self.assertEqual(self.seq[self.o], self.seq[-2])
  82
  83     def test_slice(self):
  84         self.o.ind = 1
  85         self.o2.ind = 3
  86         self.n.ind = 2
  87         self.n2.ind = 4
  88         self.assertEqual(self.seq[self.o:self.o2], self.seq[1:3])
  89         self.assertEqual(self.seq[self.n:self.n2], self.seq[2:4])
  90
  91     def test_repeat(self):
  92         self.o.ind = 3
  93         self.n.ind = 2
  94         self.assertEqual(self.seq * self.o, self.seq * 3)
  95         self.assertEqual(self.seq * self.n, self.seq * 2)
  96         self.assertEqual(self.o * self.seq, self.seq * 3)
  97         self.assertEqual(self.n * self.seq, self.seq * 2)
  98
  99     def test_wrappers(self):
 100         self.o.ind = 4
 101         self.n.ind = 5
 102         self.assertEqual(self.seq.__getitem__(self.o), self.seq[4])
 103         self.assertEqual(self.seq.__mul__(self.o), self.seq * 4)
 104         self.assertEqual(self.seq.__rmul__(self.o), self.seq * 4)
 105         self.assertEqual(self.seq.__getitem__(self.n), self.seq[5])
 106         self.assertEqual(self.seq.__mul__(self.n), self.seq * 5)
 107         self.assertEqual(self.seq.__rmul__(self.n), self.seq * 5)
 108
 109     def test_subclasses(self):
 110         self.assertEqual(self.seq[TrapInt()], self.seq[0])
 111         self.assertEqual(self.seq[TrapLong()], self.seq[0])
 112
 113     def test_error(self):
 114         self.o.ind = 'dumb'
 115         self.n.ind = 'bad'
 116         indexobj = lambda x, obj: obj.seq[x]
 117         self.failUnlessRaises(TypeError, indexobj, self.o, self)
 118         self.failUnlessRaises(TypeError, indexobj, self.n, self)
 119         sliceobj = lambda x, obj: obj.seq[x:]
 120         self.failUnlessRaises(TypeError, sliceobj, self.o, self)
 121         self.failUnlessRaises(TypeError, sliceobj, self.n, self)
 122
 123
 124 class ListTestCase(SeqTestCase):
 125     seq = [0,10,20,30,40,50]
 126
 127     def test_setdelitem(self):
 128         self.o.ind = -2
 129         self.n.ind = 2
 130         lst = list('ab!cdefghi!j')
 131         del lst[self.o]
 132         del lst[self.n]
 133         lst[self.o] = 'X'
 134         lst[self.n] = 'Y'
 135         self.assertEqual(lst, list('abYdefghXj'))
 136
 137         lst = [5, 6, 7, 8, 9, 10, 11]
 138         lst.__setitem__(self.n, "here")
 139         self.assertEqual(lst, [5, 6, "here", 8, 9, 10, 11])
 140         lst.__delitem__(self.n)
 141         self.assertEqual(lst, [5, 6, 8, 9, 10, 11])
 142
 143     def test_inplace_repeat(self):
 144         self.o.ind = 2
 145         self.n.ind = 3
 146         lst = [6, 4]
 147         lst *= self.o
 148         self.assertEqual(lst, [6, 4, 6, 4])
 149         lst *= self.n
 150         self.assertEqual(lst, [6, 4, 6, 4] * 3)
 151
 152         lst = [5, 6, 7, 8, 9, 11]
 153         l2 = lst.__imul__(self.n)
 154         self.assert_(l2 is lst)
 155         self.assertEqual(lst, [5, 6, 7, 8, 9, 11] * 3)
 156
 157
 158 class TupleTestCase(SeqTestCase):
 159     seq = (0,10,20,30,40,50)
 160
 161 class StringTestCase(SeqTestCase):
 162     seq = "this is a test"
 163
 164 class UnicodeTestCase(SeqTestCase):
 165     seq = "this is a test"
 166
 167
 168 class OverflowTestCase(unittest.TestCase):
 169
 170     def setUp(self):
 171         self.pos = 2**100
 172         self.neg = -self.pos
 173
 174     def test_large_longs(self):
 175         self.assertEqual(self.pos.__index__(), self.pos)
 176         self.assertEqual(self.neg.__index__(), self.neg)
 177
 178     def test_getitem(self):
 179         class GetItem(object):
 180             def __len__(self):
 181                 return sys.maxsize
 182             def __getitem__(self, key):
 183                 return key
 184         x = GetItem()
 185         self.assertEqual(x[self.pos], self.pos)
 186         self.assertEqual(x[self.neg], self.neg)
 187         self.assertEqual(x[self.neg:self.pos].indices(maxsize),
 188                          (0, maxsize, 1))
 189
 190     def test_sequence_repeat(self):
 191         self.failUnlessRaises(OverflowError, lambda: "a" * self.pos)
 192         self.failUnlessRaises(OverflowError, lambda: "a" * self.neg)
 193
 194
 195 def test_main():
 196     support.run_unittest(
 197         BaseTestCase,
 198         ListTestCase,
 199         TupleTestCase,
 200         StringTestCase,
 201         UnicodeTestCase,
 202         OverflowTestCase,
 203     )
 204
 205 if __name__ == "__main__":
 206     test_main()