| from ctypes import * |
| import unittest |
| |
| class VarSizeTest(unittest.TestCase): |
| def test_resize(self): |
| class X(Structure): |
| _fields_ = [("item", c_int), |
| ("array", c_int * 1)] |
| |
| self.assertEqual(sizeof(X), sizeof(c_int) * 2) |
| x = X() |
| x.item = 42 |
| x.array[0] = 100 |
| self.assertEqual(sizeof(x), sizeof(c_int) * 2) |
| |
| # make room for one additional item |
| new_size = sizeof(X) + sizeof(c_int) * 1 |
| resize(x, new_size) |
| self.assertEqual(sizeof(x), new_size) |
| self.assertEqual((x.item, x.array[0]), (42, 100)) |
| |
| # make room for 10 additional items |
| new_size = sizeof(X) + sizeof(c_int) * 9 |
| resize(x, new_size) |
| self.assertEqual(sizeof(x), new_size) |
| self.assertEqual((x.item, x.array[0]), (42, 100)) |
| |
| # make room for one additional item |
| new_size = sizeof(X) + sizeof(c_int) * 1 |
| resize(x, new_size) |
| self.assertEqual(sizeof(x), new_size) |
| self.assertEqual((x.item, x.array[0]), (42, 100)) |
| |
| def test_array_invalid_length(self): |
| # cannot create arrays with non-positive size |
| self.assertRaises(ValueError, lambda: c_int * -1) |
| self.assertRaises(ValueError, lambda: c_int * -3) |
| |
| def test_zerosized_array(self): |
| array = (c_int * 0)() |
| # accessing elements of zero-sized arrays raise IndexError |
| self.assertRaises(IndexError, array.__setitem__, 0, None) |
| self.assertRaises(IndexError, array.__getitem__, 0) |
| self.assertRaises(IndexError, array.__setitem__, 1, None) |
| self.assertRaises(IndexError, array.__getitem__, 1) |
| self.assertRaises(IndexError, array.__setitem__, -1, None) |
| self.assertRaises(IndexError, array.__getitem__, -1) |
| |
| if __name__ == "__main__": |
| unittest.main() |
