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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()
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