def METHOD_NAME(mass):
    V = FiniteElement("CG", triangle, 1)
    v = Cofunction(V)
    assert(v + mass)
    assert(mass + v)
    assert(isinstance((mass+v), FormSum))
    assert(len((mass + v + v).components()) == 3)
    # Variational forms are summed appropriately
    assert(len((mass + v + mass).components()) == 2)
    assert(v - mass)
    assert(mass - v)
    assert(isinstance((mass+v), FormSum))
    assert(-v)
    assert(isinstance(-v, BaseForm))
    assert((-v).weights()[0] == -1)
    assert(2 * v)
    assert(isinstance(2 * v, BaseForm))
    assert((2 * v).weights()[0] == 2) 