def test_show():
    d = {1:2, 3:4}
    l = [1,2,3]
    l2 = [1,2,3,4]
    tup = ("Hello, world!", "Goodbye, cruel world")
    tup2 = (tup, tup, tup, tup)
    tup3 = (3,)

    from sizer import scanner
    objs = scanner.Objects([d,l,l2,tup,tup2,tup3])
    assert objs[id(d)].show() == "{1: 2, 3: 4}"
    assert objs[id(l)].show() == "[1, 2, 3]"
    assert objs[id(l2)].show()[:8] == "list at "
    assert objs[id(tup)].show() == "('Hello, world!', 'Goodbye, cruel world')"
    assert objs[id(tup2)].show()[:9] == "tuple at "
    assert objs[id(tup3)].show() == "(3,)"