def METHOD_NAME():
    cell = triangle
    domain = Mesh(cell)
    element = FiniteElement("Lagrange", cell, 1)
    V = FunctionSpace(domain, element)
    v = TestFunction(V)
    f = Coefficient(V)
    x = SpatialCoordinate(domain)[0]
    assert (x * dx).ufl_domains() == (domain,)
    assert (v * dx).ufl_domains() == (domain,)
    assert (f * dx).ufl_domains() == (domain,)
    assert (x * v * f * dx).ufl_domains() == (domain,)
    assert (1 * dx(domain)).ufl_domains() == (domain,)