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1 # tests for slice objects; in particular the indices method. |
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2 |
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3 import unittest |
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4 from test import test_support |
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5 from cPickle import loads, dumps |
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6 |
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7 import sys |
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8 |
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9 class SliceTest(unittest.TestCase): |
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10 |
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11 def test_constructor(self): |
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12 self.assertRaises(TypeError, slice) |
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13 self.assertRaises(TypeError, slice, 1, 2, 3, 4) |
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14 |
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15 def test_repr(self): |
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16 self.assertEqual(repr(slice(1, 2, 3)), "slice(1, 2, 3)") |
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17 |
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18 def test_hash(self): |
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19 # Verify clearing of SF bug #800796 |
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20 self.assertRaises(TypeError, hash, slice(5)) |
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21 self.assertRaises(TypeError, slice(5).__hash__) |
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22 |
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23 def test_cmp(self): |
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24 s1 = slice(1, 2, 3) |
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25 s2 = slice(1, 2, 3) |
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26 s3 = slice(1, 2, 4) |
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27 self.assertEqual(s1, s2) |
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28 self.assertNotEqual(s1, s3) |
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29 |
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30 class Exc(Exception): |
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31 pass |
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32 |
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33 class BadCmp(object): |
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34 def __eq__(self, other): |
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35 raise Exc |
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36 __hash__ = None # Silence Py3k warning |
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37 |
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38 s1 = slice(BadCmp()) |
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39 s2 = slice(BadCmp()) |
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40 self.assertRaises(Exc, cmp, s1, s2) |
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41 self.assertEqual(s1, s1) |
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42 |
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43 s1 = slice(1, BadCmp()) |
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44 s2 = slice(1, BadCmp()) |
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45 self.assertEqual(s1, s1) |
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46 self.assertRaises(Exc, cmp, s1, s2) |
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47 |
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48 s1 = slice(1, 2, BadCmp()) |
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49 s2 = slice(1, 2, BadCmp()) |
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50 self.assertEqual(s1, s1) |
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51 self.assertRaises(Exc, cmp, s1, s2) |
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52 |
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53 def test_members(self): |
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54 s = slice(1) |
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55 self.assertEqual(s.start, None) |
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56 self.assertEqual(s.stop, 1) |
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57 self.assertEqual(s.step, None) |
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58 |
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59 s = slice(1, 2) |
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60 self.assertEqual(s.start, 1) |
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61 self.assertEqual(s.stop, 2) |
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62 self.assertEqual(s.step, None) |
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63 |
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64 s = slice(1, 2, 3) |
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65 self.assertEqual(s.start, 1) |
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66 self.assertEqual(s.stop, 2) |
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67 self.assertEqual(s.step, 3) |
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68 |
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69 class AnyClass: |
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70 pass |
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71 |
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72 obj = AnyClass() |
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73 s = slice(obj) |
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74 self.assert_(s.stop is obj) |
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75 |
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76 def test_indices(self): |
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77 self.assertEqual(slice(None ).indices(10), (0, 10, 1)) |
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78 self.assertEqual(slice(None, None, 2).indices(10), (0, 10, 2)) |
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79 self.assertEqual(slice(1, None, 2).indices(10), (1, 10, 2)) |
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80 self.assertEqual(slice(None, None, -1).indices(10), (9, -1, -1)) |
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81 self.assertEqual(slice(None, None, -2).indices(10), (9, -1, -2)) |
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82 self.assertEqual(slice(3, None, -2).indices(10), (3, -1, -2)) |
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83 # issue 3004 tests |
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84 self.assertEqual(slice(None, -9).indices(10), (0, 1, 1)) |
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85 self.assertEqual(slice(None, -10).indices(10), (0, 0, 1)) |
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86 self.assertEqual(slice(None, -11).indices(10), (0, 0, 1)) |
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87 self.assertEqual(slice(None, -10, -1).indices(10), (9, 0, -1)) |
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88 self.assertEqual(slice(None, -11, -1).indices(10), (9, -1, -1)) |
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89 self.assertEqual(slice(None, -12, -1).indices(10), (9, -1, -1)) |
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90 self.assertEqual(slice(None, 9).indices(10), (0, 9, 1)) |
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91 self.assertEqual(slice(None, 10).indices(10), (0, 10, 1)) |
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92 self.assertEqual(slice(None, 11).indices(10), (0, 10, 1)) |
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93 self.assertEqual(slice(None, 8, -1).indices(10), (9, 8, -1)) |
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94 self.assertEqual(slice(None, 9, -1).indices(10), (9, 9, -1)) |
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95 self.assertEqual(slice(None, 10, -1).indices(10), (9, 9, -1)) |
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96 |
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97 self.assertEqual( |
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98 slice(-100, 100 ).indices(10), |
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99 slice(None).indices(10) |
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100 ) |
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101 self.assertEqual( |
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102 slice(100, -100, -1).indices(10), |
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103 slice(None, None, -1).indices(10) |
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104 ) |
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105 self.assertEqual(slice(-100L, 100L, 2L).indices(10), (0, 10, 2)) |
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106 |
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107 self.assertEqual(range(10)[::sys.maxint - 1], [0]) |
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108 |
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109 self.assertRaises(OverflowError, slice(None).indices, 1L<<100) |
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110 |
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111 def test_setslice_without_getslice(self): |
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112 tmp = [] |
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113 class X(object): |
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114 def __setslice__(self, i, j, k): |
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115 tmp.append((i, j, k)) |
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116 |
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117 x = X() |
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118 x[1:2] = 42 |
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119 self.assertEquals(tmp, [(1, 2, 42)]) |
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120 |
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121 def test_pickle(self): |
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122 s = slice(10, 20, 3) |
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123 for protocol in (0,1,2): |
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124 t = loads(dumps(s, protocol)) |
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125 self.assertEqual(s, t) |
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126 self.assertEqual(s.indices(15), t.indices(15)) |
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127 self.assertNotEqual(id(s), id(t)) |
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128 |
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129 def test_main(): |
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130 test_support.run_unittest(SliceTest) |
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131 |
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132 if __name__ == "__main__": |
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133 test_main() |