def METHOD_NAME(cls):
    exclusion1 = BluemiraFace(
        make_polygon([[6, 9, 9, 6], [0, 0, 0, 0], [0, 0, 20, 20]], closed=True)
    )
    exclusion2 = BluemiraFace(
        make_polygon([[9, 20, 20, 9], [0, 0, 0, 0], [-1, -1, 1, 1]], closed=True)
    )
    cls.exclusions = [exclusion1, exclusion2]
    cls.coils = [
        Coil(4, 9, current=1e6, j_max=1),
        Coil(9, -9, current=1e6, j_max=1),
        Coil(12, 0.1, current=1e6, j_max=1),
        Coil(6, -10, current=1e6, j_max=1),
    ]