'Test the _write_button_path() method'

def test_write_button_path(self):

    self.vml._write_button_path()
    exp = '<v:path    shadowok="f"    o:extrusionok="f"    strokeok="f"    fillok="f"    o:connecttype="rect"/>'
    got = self.fh.getvalue()
    self.assertEqual(got, exp)
