def METHOD_NAME(self):
    environment = Environment(environment={})
    data = {claripy.BVV(b"value\x00", 6 * 8)}
    environment.set(UNDEFINED, data)
    # Testing internal attribute which is not ideal, but I'am trying to not rely on any other behavior
    # (e.g. without using `get`).
    self.assertDictEqual(environment._environment, {UNDEFINED: data})