assertraises behaviour

I found that the behaviour of assertRaises used as a context manager a
bit surprising.

This small example doesn't fail, but the OSError exception is cathed
even if not declared..
Is this the expected behaviour (from the doc I would say it's not).
(Running on arch-linux 64 bits and Python 2.7.3, but it doesn the same
with Python 3.2.3)

import unittest

class TestWithRaises(unittest.TestCase):
def test_ass(self):
with self.assertRaises(AssertionError):
assert False, "should happen"
raise OSError("should give error")


if __name__ == '__main__':
unittest.main()
.

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