def test_smooth_window_len_must_be_odd(self):
        with capture(smooth, x=self.x_20, window_len=4) as output:
            self.assertRegexpMatches(output, "reset")
estspec: smooth changes even window_len to odd
dataset/ETHPy150Open QuantEcon/QuantEcon.py/quantecon/tests/test_estspec.py/TestSmooth.test_smooth_window_len_must_be_odd