'Show that etag resets to None after refreshing the object.'

def test_resets_etag(self):

    cassette_name = self.cassette_name('resets_etag')
    with self.recorder.use_cassette(cassette_name):
        users_iter = self.gh.all_users(number=10)
        assert (users_iter.etag is None)
        next(users_iter)
        assert (users_iter.etag is not None)
        users_iter.refresh()
        assert (users_iter.etag is None)
