FreeOpcUa / python-opcua

        self.assertEqual(myhandler.datachange_count, 1)

        sub.delete()

    def test_subscription_count_empty(self):

        myhandler = MySubHandlerCounter()

        sub = self.opc.create_subscription(1, myhandler)

        o = self.opc.get_objects_node()

        var = o.add_variable(3, 'SubVarCounter', [0.1, 0.2, 0.3])

        sub.subscribe_data_change(var)

        while True:

            val = var.get_value()

            val.pop()

            var.set_value(val, ua.VariantType.Double)

            if not val:

                break

        time.sleep(0.2)  # let last event arrive

        self.assertEqual(myhandler.datachange_count, 4)

        sub.delete()

    def test_subscription_overload_simple(self):

        nb = 10

        self.assertEqual(myhandler.datachange_count, nb + 1)

        sub.delete()

    def test_subscription_count_list(self):

        myhandler = MySubHandlerCounter()

        sub = self.opc.create_subscription(1, myhandler)

        o = self.opc.get_objects_node()

        var = o.add_variable(3, 'SubVarCounter', [0.1, 0.2])

        sub.subscribe_data_change(var)

        nb = 12

        for i in range(nb):

            val = var.get_value()

            val.append(i)

            var.set_value(val)

        time.sleep(0.2)  # let last event arrive

        self.assertEqual(myhandler.datachange_count, nb + 1)

        sub.delete()

    def test_subscription_count_no_change(self):

        myhandler = MySubHandlerCounter()