'Test behavior when no scale is provided'

def test_scale_default(self):

    t = Time(100.0, format='cxcsec')
    assert (t.scale == 'tt')
    t = Time(100.0, format='unix')
    assert (t.scale == 'utc')
    t = Time(100.0, format='gps')
    assert (t.scale == 'tai')
    for date in ('J2000', '2000:001', '2000-01-01T00:00:00'):
        t = Time(date)
        assert (t.scale == 'utc')
    t = Time(2000.1, format='byear')
    assert (t.scale == 'utc')
