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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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50 lines
1.8 KiB
Python
50 lines
1.8 KiB
Python
from ctypes import *
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import unittest
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class VarSizeTest(unittest.TestCase):
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def test_resize(self):
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class X(Structure):
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_fields_ = [("item", c_int),
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("array", c_int * 1)]
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self.assertEqual(sizeof(X), sizeof(c_int) * 2)
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x = X()
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x.item = 42
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x.array[0] = 100
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self.assertEqual(sizeof(x), sizeof(c_int) * 2)
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# make room for one additional item
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new_size = sizeof(X) + sizeof(c_int) * 1
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resize(x, new_size)
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self.assertEqual(sizeof(x), new_size)
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self.assertEqual((x.item, x.array[0]), (42, 100))
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# make room for 10 additional items
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new_size = sizeof(X) + sizeof(c_int) * 9
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resize(x, new_size)
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self.assertEqual(sizeof(x), new_size)
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self.assertEqual((x.item, x.array[0]), (42, 100))
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# make room for one additional item
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new_size = sizeof(X) + sizeof(c_int) * 1
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resize(x, new_size)
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self.assertEqual(sizeof(x), new_size)
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self.assertEqual((x.item, x.array[0]), (42, 100))
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def test_array_invalid_length(self):
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# cannot create arrays with non-positive size
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self.assertRaises(ValueError, lambda: c_int * -1)
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self.assertRaises(ValueError, lambda: c_int * -3)
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def test_zerosized_array(self):
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array = (c_int * 0)()
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# accessing elements of zero-sized arrays raise IndexError
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self.assertRaises(IndexError, array.__setitem__, 0, None)
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self.assertRaises(IndexError, array.__getitem__, 0)
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self.assertRaises(IndexError, array.__setitem__, 1, None)
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self.assertRaises(IndexError, array.__getitem__, 1)
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self.assertRaises(IndexError, array.__setitem__, -1, None)
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self.assertRaises(IndexError, array.__getitem__, -1)
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if __name__ == "__main__":
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unittest.main()
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