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41 lines
1.0 KiB
41 lines
1.0 KiB
5 years ago
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from ctypes import *
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import unittest
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class X(Structure):
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_fields_ = [("a", c_int),
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("b", c_int)]
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new_was_called = False
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def __new__(cls):
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result = super().__new__(cls)
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result.new_was_called = True
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return result
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def __init__(self):
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self.a = 9
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self.b = 12
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class Y(Structure):
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_fields_ = [("x", X)]
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class InitTest(unittest.TestCase):
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def test_get(self):
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# make sure the only accessing a nested structure
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# doesn't call the structure's __new__ and __init__
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y = Y()
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self.assertEqual((y.x.a, y.x.b), (0, 0))
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self.assertEqual(y.x.new_was_called, False)
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# But explicitly creating an X structure calls __new__ and __init__, of course.
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x = X()
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self.assertEqual((x.a, x.b), (9, 12))
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self.assertEqual(x.new_was_called, True)
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y.x = x
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self.assertEqual((y.x.a, y.x.b), (9, 12))
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self.assertEqual(y.x.new_was_called, False)
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if __name__ == "__main__":
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unittest.main()
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