50 lines
1.5 KiB
Python
50 lines
1.5 KiB
Python
import unittest
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from ctypes import *
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class StructFieldsTestCase(unittest.TestCase):
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# Structure/Union classes must get 'finalized' sooner or
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# later, when one of these things happen:
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#
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# 1. _fields_ is set.
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# 2. An instance is created.
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# 3. The type is used as field of another Structure/Union.
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# 4. The type is subclassed
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#
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# When they are finalized, assigning _fields_ is no longer allowed.
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def test_1_A(self):
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class X(Structure):
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pass
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self.assertEqual(sizeof(X), 0) # not finalized
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X._fields_ = [] # finalized
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self.assertRaises(AttributeError, setattr, X, "_fields_", [])
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def test_1_B(self):
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class X(Structure):
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_fields_ = [] # finalized
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self.assertRaises(AttributeError, setattr, X, "_fields_", [])
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def test_2(self):
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class X(Structure):
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pass
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X()
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self.assertRaises(AttributeError, setattr, X, "_fields_", [])
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def test_3(self):
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class X(Structure):
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pass
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class Y(Structure):
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_fields_ = [("x", X)] # finalizes X
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self.assertRaises(AttributeError, setattr, X, "_fields_", [])
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def test_4(self):
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class X(Structure):
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pass
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class Y(X):
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pass
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self.assertRaises(AttributeError, setattr, X, "_fields_", [])
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Y._fields_ = []
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self.assertRaises(AttributeError, setattr, X, "_fields_", [])
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if __name__ == "__main__":
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unittest.main()
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