def METHOD_NAME(mass, stiffness, convection, load):
    v, u = mass.arguments()
    f, = load.coefficients()
    assert v.number() == 0
    assert u.number() == 1
    assert stiffness.arguments() == (v, u)
    assert load.arguments() == (v,)
    assert (v * dx).arguments() == (v,)
    assert (v * dx + v * ds).arguments() == (v,)
    assert (v * dx + f * v * ds).arguments() == (v,)
    assert (u * v * dx(1) + v * u * dx(2)).arguments() == (v, u)
    assert ((f * v) * u * dx + (u * 3) * (v / 2) * dx(2)).arguments() == (v, u)