def test_can_check_used_assignment(self):
handler = CodeHandler()
handler.varis = dict(a=0)
handler.get_declared().clear()
handler.add_declared("a", Block("a := 1"))
block = Block('fmt.Println(a)')
handler.scan_used([block])
self.assertEqual(len(list(handler.get_params())), 1)
self.assertTrue("a" in handler.get_params())
