'Real-valued Bessel domains'

def test_ticket_854(self):

    assert_(isnan(special.jv(0.5, (-1))))
    assert_(isnan(special.iv(0.5, (-1))))
    assert_(isnan(special.yv(0.5, (-1))))
    assert_(isnan(special.yv(1, (-1))))
    assert_(isnan(special.kv(0.5, (-1))))
    assert_(isnan(special.kv(1, (-1))))
    assert_(isnan(special.jve(0.5, (-1))))
    assert_(isnan(special.ive(0.5, (-1))))
    assert_(isnan(special.yve(0.5, (-1))))
    assert_(isnan(special.yve(1, (-1))))
    assert_(isnan(special.kve(0.5, (-1))))
    assert_(isnan(special.kve(1, (-1))))
    assert_(isnan(special.airye((-1))[0:2]).all(), special.airye((-1)))
    assert_((not isnan(special.airye((-1))[2:4]).any()), special.airye((-1)))
