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  def test_singleton_class_included_class_variable

    c = Class.new

    c.extend(Olympians)

    assert_empty(c.singleton_class.class_variables)

    assert_raise(NameError){ c.singleton_class.class_variable_get(:@@rule) }

    c.class_variable_set(:@@foo, 1)

    assert_equal([:@@foo], c.singleton_class.class_variables)

    assert_equal(1, c.singleton_class.class_variable_get(:@@foo))

    c = Class.new

    c.extend(Olympians)

    sc = Class.new(c)

    assert_empty(sc.singleton_class.class_variables)

    assert_raise(NameError){ sc.singleton_class.class_variable_get(:@@rule) }

    c.class_variable_set(:@@foo, 1)

    assert_equal([:@@foo], sc.singleton_class.class_variables)

    assert_equal(1, sc.singleton_class.class_variable_get(:@@foo))

    c = Class.new

    o = c.new

    o.extend(Olympians)

    assert_equal([:@@rule], o.singleton_class.class_variables)

    assert_equal("Zeus", o.singleton_class.class_variable_get(:@@rule))

    c.class_variable_set(:@@foo, 1)

    assert_equal([:@@foo, :@@rule], o.singleton_class.class_variables.sort)

    assert_equal(1, o.singleton_class.class_variable_get(:@@foo))

  end

    if (FL_TEST(mod, FL_SINGLETON)) {

        if (rb_namespace_p(rb_ivar_get(mod, id__attached__))) {

            data = mod_cvar_at(tmp, data);

            tmp = cvar_front_klass(tmp);

        }

    }