But, it is unclear to me why <code>assert_raises(DeprecationWarning)</code> doesn't work.  When I do, e.g.,

    assert_raises(DeprecationWarning, read_evoked, fname, setno=0)

I can see the warning in the terminal output, whereas I don't see it when I do

    assert_raises(DeprecationWarning, read_evoked, fname, condition=0)