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74 lines
2.5 KiB
74 lines
2.5 KiB
6 years ago
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import unittest
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import test.support
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from ctypes import *
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class AnonTest(unittest.TestCase):
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def test_anon(self):
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class ANON(Union):
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_fields_ = [("a", c_int),
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("b", c_int)]
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class Y(Structure):
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_fields_ = [("x", c_int),
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("_", ANON),
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("y", c_int)]
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_anonymous_ = ["_"]
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self.assertEqual(Y.a.offset, sizeof(c_int))
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self.assertEqual(Y.b.offset, sizeof(c_int))
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self.assertEqual(ANON.a.offset, 0)
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self.assertEqual(ANON.b.offset, 0)
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def test_anon_nonseq(self):
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# TypeError: _anonymous_ must be a sequence
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self.assertRaises(TypeError,
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lambda: type(Structure)("Name",
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(Structure,),
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{"_fields_": [], "_anonymous_": 42}))
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def test_anon_nonmember(self):
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# AttributeError: type object 'Name' has no attribute 'x'
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self.assertRaises(AttributeError,
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lambda: type(Structure)("Name",
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(Structure,),
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{"_fields_": [],
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"_anonymous_": ["x"]}))
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@test.support.cpython_only
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def test_issue31490(self):
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# There shouldn't be an assertion failure in case the class has an
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# attribute whose name is specified in _anonymous_ but not in _fields_.
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# AttributeError: 'x' is specified in _anonymous_ but not in _fields_
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with self.assertRaises(AttributeError):
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class Name(Structure):
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_fields_ = []
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_anonymous_ = ["x"]
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x = 42
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def test_nested(self):
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class ANON_S(Structure):
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_fields_ = [("a", c_int)]
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class ANON_U(Union):
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_fields_ = [("_", ANON_S),
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("b", c_int)]
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_anonymous_ = ["_"]
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class Y(Structure):
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_fields_ = [("x", c_int),
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("_", ANON_U),
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("y", c_int)]
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_anonymous_ = ["_"]
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self.assertEqual(Y.x.offset, 0)
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self.assertEqual(Y.a.offset, sizeof(c_int))
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self.assertEqual(Y.b.offset, sizeof(c_int))
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self.assertEqual(Y._.offset, sizeof(c_int))
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self.assertEqual(Y.y.offset, sizeof(c_int) * 2)
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if __name__ == "__main__":
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unittest.main()
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