def test_command_prev_min(self):
xkcd.sel_comic = 1
xkcd.command_prev()
self.assertEqual(xkcd.sel_comic, 1)
def test_command_prev_many(self):
xkcd.sel_comic = 676
xkcd.command_prev(10)
self.assertEqual(xkcd.sel_comic, 666)
def test_command_prev_404(self):
xkcd.sel_comic = 405
xkcd.command_prev()
self.assertEqual(xkcd.sel_comic, 403)
def test_command_prev_1(self):
xkcd.sel_comic = 667
xkcd.command_prev()
self.assertEqual(xkcd.sel_comic, 666)