def METHOD_NAME(self, lon):
    aea = ccrs.AlbersEqualArea()
    aea_offset = ccrs.AlbersEqualArea(central_longitude=lon)
    other_args = {'ellps=WGS84', f'lon_0={lon}', 'lat_0=0.0',
                  'x_0=0.0', 'y_0=0.0', 'lat_1=20.0', 'lat_2=50.0'}
    check_proj_params('aea', aea_offset, other_args)
    assert_array_almost_equal(
        aea_offset.boundary.coords,
        aea.boundary.coords,
        decimal=0,
    )