def METHOD_NAME():
    # Make sure that things work properly when the low-level WCS uses the same
    # class, and specifically a SkyCoord for two of the coordinates.
    wcs = SkyCoordDuplicateWCS()
    c1, c2 = wcs.pixel_to_world(1, 2, 3, 4)
    assert isinstance(c1, SkyCoord)
    assert isinstance(c2, SkyCoord)
    x, y, z, a = wcs.world_to_pixel(c1, c2)
    assert_allclose(x, 1)
    assert_allclose(y, 2)
    assert_allclose(z, 3)
    assert_allclose(a, 4)