def METHOD_NAME(self):
    center = SkyCoord([1, 2] * u.deg, [3, 4] * u.deg)
    radius = 2 * u.arcsec
    with pytest.raises(ValueError) as excinfo:
        CircleSkyRegion(center, radius)
    estr = "'center' must be a scalar SkyCoord"
    assert estr in str(excinfo.value)