| 1 | n/a | from ctypes import * |
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| 2 | n/a | import unittest |
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| 3 | n/a | |
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| 4 | n/a | class VarSizeTest(unittest.TestCase): |
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| 5 | n/a | def test_resize(self): |
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| 6 | n/a | class X(Structure): |
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| 7 | n/a | _fields_ = [("item", c_int), |
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| 8 | n/a | ("array", c_int * 1)] |
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| 9 | n/a | |
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| 10 | n/a | self.assertEqual(sizeof(X), sizeof(c_int) * 2) |
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| 11 | n/a | x = X() |
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| 12 | n/a | x.item = 42 |
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| 13 | n/a | x.array[0] = 100 |
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| 14 | n/a | self.assertEqual(sizeof(x), sizeof(c_int) * 2) |
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| 15 | n/a | |
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| 16 | n/a | # make room for one additional item |
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| 17 | n/a | new_size = sizeof(X) + sizeof(c_int) * 1 |
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| 18 | n/a | resize(x, new_size) |
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| 19 | n/a | self.assertEqual(sizeof(x), new_size) |
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| 20 | n/a | self.assertEqual((x.item, x.array[0]), (42, 100)) |
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| 21 | n/a | |
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| 22 | n/a | # make room for 10 additional items |
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| 23 | n/a | new_size = sizeof(X) + sizeof(c_int) * 9 |
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| 24 | n/a | resize(x, new_size) |
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| 25 | n/a | self.assertEqual(sizeof(x), new_size) |
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| 26 | n/a | self.assertEqual((x.item, x.array[0]), (42, 100)) |
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| 27 | n/a | |
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| 28 | n/a | # make room for one additional item |
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| 29 | n/a | new_size = sizeof(X) + sizeof(c_int) * 1 |
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| 30 | n/a | resize(x, new_size) |
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| 31 | n/a | self.assertEqual(sizeof(x), new_size) |
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| 32 | n/a | self.assertEqual((x.item, x.array[0]), (42, 100)) |
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| 33 | n/a | |
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| 34 | n/a | def test_array_invalid_length(self): |
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| 35 | n/a | # cannot create arrays with non-positive size |
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| 36 | n/a | self.assertRaises(ValueError, lambda: c_int * -1) |
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| 37 | n/a | self.assertRaises(ValueError, lambda: c_int * -3) |
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| 38 | n/a | |
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| 39 | n/a | def test_zerosized_array(self): |
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| 40 | n/a | array = (c_int * 0)() |
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| 41 | n/a | # accessing elements of zero-sized arrays raise IndexError |
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| 42 | n/a | self.assertRaises(IndexError, array.__setitem__, 0, None) |
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| 43 | n/a | self.assertRaises(IndexError, array.__getitem__, 0) |
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| 44 | n/a | self.assertRaises(IndexError, array.__setitem__, 1, None) |
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| 45 | n/a | self.assertRaises(IndexError, array.__getitem__, 1) |
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| 46 | n/a | self.assertRaises(IndexError, array.__setitem__, -1, None) |
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| 47 | n/a | self.assertRaises(IndexError, array.__getitem__, -1) |
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| 48 | n/a | |
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| 49 | n/a | if __name__ == "__main__": |
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| 50 | n/a | unittest.main() |
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