def METHOD_NAME(self):
    """
    Trying screwing up the geometry and get the same results.
    """
    solver = ChargedParticleSolver(self.params, self.solver.eq, dx_mp=0.001)
    fw = deepcopy(self.solver.first_wall)
    fw.open()
    fw.reverse()
    x, z, hf = solver.analyse(fw)
    assert solver.first_wall.closed
    assert solver.first_wall.check_ccw()
    assert np.allclose(self.hf, hf)
    assert np.allclose(self.x, x)
    assert np.allclose(self.z, z)