def METHOD_NAME():
    assert repr(Arrow((), Ob('x'), Ob('x'))) == "cat.Arrow.id(cat.Ob('x'))"
    inside = (Box('f', Ob('x'), Ob('y')), Box('g', Ob('y'), Ob('z')))
    assert repr(Arrow(inside, Ob('x'), Ob('z')))\
        == "cat.Arrow(inside=(cat.Box('f', cat.Ob('x'), cat.Ob('y')), "\
           "cat.Box('g', cat.Ob('y'), cat.Ob('z'))), dom=cat.Ob('x'), "\
           "cod=cat.Ob('z'))"