missing a way to use assertRaises as context manager

[petrblaho]

I think that it would be useful if we can use assertRaises as context manager the same way as in unittest.
That way allows to organize code better (block of code) and store raised exception to variable for further inspection.

[jml]

FWIW, you can use assertRaises like this:

e = self.assertRaises(RuntimeException, f, x, y)
self.assertEqual("Some error", str(e))

I personally prefer the way we have it now. It's possible that compatibility is a stronger goal.

[petrblaho]

Thanks for reply, @jml .

I did not realized it can be solved this way.