/Lib/ctypes/test/test_varsize_struct.py
http://unladen-swallow.googlecode.com/ · Python · 50 lines · 37 code · 8 blank · 5 comment · 1 complexity · bb322516d3bcde9a4ef228684bc8e256 MD5 · raw file
- 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.failUnlessEqual(sizeof(X), sizeof(c_int) * 2)
- x = X()
- x.item = 42
- x.array[0] = 100
- self.failUnlessEqual(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.failUnlessEqual(sizeof(x), new_size)
- self.failUnlessEqual((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.failUnlessEqual(sizeof(x), new_size)
- self.failUnlessEqual((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.failUnlessEqual(sizeof(x), new_size)
- self.failUnlessEqual((x.item, x.array[0]), (42, 100))
- def test_array_invalid_length(self):
- # cannot create arrays with non-positive size
- self.failUnlessRaises(ValueError, lambda: c_int * -1)
- self.failUnlessRaises(ValueError, lambda: c_int * -3)
- def test_zerosized_array(self):
- array = (c_int * 0)()
- # accessing elements of zero-sized arrays raise IndexError
- self.failUnlessRaises(IndexError, array.__setitem__, 0, None)
- self.failUnlessRaises(IndexError, array.__getitem__, 0)
- self.failUnlessRaises(IndexError, array.__setitem__, 1, None)
- self.failUnlessRaises(IndexError, array.__getitem__, 1)
- self.failUnlessRaises(IndexError, array.__setitem__, -1, None)
- self.failUnlessRaises(IndexError, array.__getitem__, -1)
- if __name__ == "__main__":
- unittest.main()