def test_roundtrip_state():
s = u'12345678'
sio1 = StringIO(s)
sio1.foo = 42
sio1.seek(2)
assert sio1.getvalue() == s
state = sio1.__getstate__()
sio2 = StringIO()
sio2.__setstate__(state)
assert sio2.getvalue() == s
assert sio2.foo == 42
assert sio2.tell() == 2
