test_c.py 文件源码

def test_struct_instance():
    BInt = new_primitive_type("int")
    BStruct = new_struct_type("struct foo")
    BStructPtr = new_pointer_type(BStruct)
    p = cast(BStructPtr, 0)
    py.test.raises(AttributeError, "p.a1")    # opaque
    complete_struct_or_union(BStruct, [('a1', BInt, -1),
                                       ('a2', BInt, -1)])
    p = newp(BStructPtr, None)
    s = p[0]
    assert s.a1 == 0
    s.a2 = 123
    assert s.a1 == 0
    assert s.a2 == 123
    py.test.raises(OverflowError, "s.a1 = sys.maxsize+1")
    assert s.a1 == 0
    py.test.raises(AttributeError, "p.foobar")
    py.test.raises(AttributeError, "s.foobar")