'Check Struve function versus its power series'

def test_vs_series(self):

    for v in [(-20), (-10), (-7.99), (-3.4), (-1), 0, 1, 3.4, 12.49, 16]:
        for z in [1, 10, 19, 21, 30]:
            (value, err) = self._series(v, z)
            (assert_tol_equal(special.struve(v, z), value, rtol=0, atol=err), (v, z))
