'A document\'s json field is refreshed on render(), but not on save()
bug 875349'

@mock.patch('kuma.wiki.models.render_done')
def test_build_json_on_render(self, mock_render_done):

    self.d1.save()
    ok_((not mock_render_done.send.called))
    mock_render_done.reset()
    self.d1.render()
    ok_(mock_render_done.send.called)
