mock the aiomqtt library and increse coverage

app/tests/test_mqtt.py

@@ -3,7 +3,8 @@ import pytest
 import asyncio
 import aiomqtt
 import logging
-from aiomqtt import MqttError
+from aiomqtt import MqttError, MessagesIterator
+from aiomqtt import Message as AiomqttMessage
 from mock import patch, Mock
 
 from async_stream import AsyncIfcImpl
@@ -34,6 +35,26 @@ def test_hostname():
     # else:
         return 'test.mosquitto.org'
 
+@pytest.fixture(scope="function")
+def aiomqtt_mock(monkeypatch):
+    recv_que = asyncio.Queue()
+        
+    async def my_aenter(self):
+        return self
+    async def my_subscribe(self, *arg):
+        return
+    async def my_anext(self):
+        return await recv_que.get()
+    async def my_receive(self, topic: str, payload: bytes):
+        msg = AiomqttMessage(topic, payload,qos=0, retain=False, mid=0, properties=None)
+        await recv_que.put(msg)
+        await asyncio.sleep(0)  # dispath the msg
+
+    monkeypatch.setattr(aiomqtt.Client, "__aenter__", my_aenter)
+    monkeypatch.setattr(aiomqtt.Client, "subscribe", my_subscribe)
+    monkeypatch.setattr(MessagesIterator, "__anext__", my_anext)
+    monkeypatch.setattr(Mqtt, "receive", my_receive, False)
+
 @pytest.fixture
 def config_mqtt_conn(test_hostname, test_port):
     Config.act_config = {'mqtt':{'host': test_hostname, 'port': test_port, 'user': '', 'passwd': ''},
@@ -250,92 +271,97 @@ async def test_mqtt_except_def_config(config_def_conn, monkeypatch, caplog):
     assert 'MQTT is unconfigured; Check your config.toml!' in caplog.text
 
 @pytest.mark.asyncio
-async def test_msg_dispatch(config_mqtt_conn, spy_modbus_cmd):
+async def test_mqtt_dispatch(config_mqtt_conn, aiomqtt_mock, spy_modbus_cmd):
     _ = config_mqtt_conn
+    _ = aiomqtt_mock
     spy = spy_modbus_cmd
     try:
         m = Mqtt(None)
-        msg = aiomqtt.Message(topic= 'homeassistant/status', payload= b'online', qos= 0, retain = False, mid= 0, properties= None)
+        assert m.ha_restarts == 0
-        await m.dispatch_msg(msg)
+        await m.receive('homeassistant/status', b'online')  # send the message
         assert m.ha_restarts == 1
 
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/rated_load', payload= b'2', qos= 0, retain = False, mid= 0, properties= None)
+        await m.receive(topic= 'tsun/inv_1/rated_load', payload= b'2')
-        await m.dispatch_msg(msg)
         spy.assert_awaited_once_with(Modbus.WRITE_SINGLE_REG, 0x2008, 2, logging.INFO)
-        
+
         spy.reset_mock()
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/out_coeff', payload= b'100', qos= 0, retain = False, mid= 0, properties= None)
+        await m.receive(topic= 'tsun/inv_1/out_coeff', payload= b'100')
-        await m.dispatch_msg(msg)
         spy.assert_awaited_once_with(Modbus.WRITE_SINGLE_REG, 0x202c, 1024, logging.INFO)
         
         spy.reset_mock()
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/out_coeff', payload= b'50', qos= 0, retain = False, mid= 0, properties= None)
+        await m.receive(topic= 'tsun/inv_1/out_coeff', payload= b'50')
-        await m.dispatch_msg(msg)
         spy.assert_awaited_once_with(Modbus.WRITE_SINGLE_REG, 0x202c, 512, logging.INFO)
     
         spy.reset_mock()
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/modbus_read_regs', payload= b'0x3000, 10', qos= 0, retain = False, mid= 0, properties= None)
+        await m.receive(topic= 'tsun/inv_1/modbus_read_regs', payload= b'0x3000, 10')
-        await m.dispatch_msg(msg)
         spy.assert_awaited_once_with(Modbus.READ_REGS, 0x3000, 10, logging.INFO)
 
         spy.reset_mock()
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/modbus_read_inputs', payload= b'0x3000, 10', qos= 0, retain = False, mid= 0, properties= None)
+        await m.receive(topic= 'tsun/inv_1/modbus_read_inputs', payload= b'0x3000, 10')
-        await m.dispatch_msg(msg)
         spy.assert_awaited_once_with(Modbus.READ_INPUTS, 0x3000, 10, logging.INFO)
 
         # test dispatching with empty mapping table
         m.topic_defs.clear()
         spy.reset_mock()
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/modbus_read_inputs', payload= b'0x3000, 10', qos= 0, retain = False, mid= 0, properties= None)
+        await m.receive(topic= 'tsun/inv_1/modbus_read_inputs', payload= b'0x3000, 10')
-        await m.dispatch_msg(msg)
         spy.assert_not_called()
 
         # test dispatching with incomplete mapping table - invalid fnc defined
         m.topic_defs.append(
             {'prefix': 'entity_prefix', 'topic': '/+/modbus_read_inputs',
-             'full_topic': 'tsun/+/modbus_read_inputs', 'fnc': 'invalid'}
+             'full_topic': 'tsun/+/modbus_read_inputs', 'fnc': 'addr'}
         )
         spy.reset_mock()
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/modbus_read_inputs', payload= b'0x3000, 10', qos= 0, retain = False, mid= 0, properties= None)
+        await m.receive(topic= 'tsun/inv_1/modbus_read_inputs', payload= b'0x3000, 10')
-        await m.dispatch_msg(msg)
         spy.assert_not_called()
 
+    except MqttError:
+        assert False
+    except Exception:
+        assert False          
     finally:
         await m.close()
 
 @pytest.mark.asyncio
-async def test_msg_dispatch_err(config_mqtt_conn, spy_modbus_cmd):
+async def test_mqtt_dispatch_err(config_mqtt_conn, aiomqtt_mock, spy_modbus_cmd, caplog):
     _ = config_mqtt_conn
+    _ = aiomqtt_mock
     spy = spy_modbus_cmd
+
+    LOGGER = logging.getLogger("mqtt")
+    LOGGER.propagate = True
+    LOGGER.setLevel(logging.INFO)
+
     try:
         m = Mqtt(None)
+
         # test out of range param
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/out_coeff', payload= b'-1', qos= 0, retain = False, mid= 0, properties= None)
+        await m.receive(topic= 'tsun/inv_1/out_coeff', payload= b'-1')
-        await m.dispatch_msg(msg)
         spy.assert_not_called()
 
         # test unknown node_id
-        spy.reset_mock()
+        await m.receive(topic= 'tsun/inv_2/out_coeff', payload= b'2')
-        msg = aiomqtt.Message(topic= 'tsun/inv_2/out_coeff', payload= b'2', qos= 0, retain = False, mid= 0, properties= None)
-        await m.dispatch_msg(msg)
         spy.assert_not_called()
 
         # test invalid fload param
-        spy.reset_mock()
+        await m.receive(topic= 'tsun/inv_1/out_coeff', payload= b'2, 3')
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/out_coeff', payload= b'2, 3', qos= 0, retain = False, mid= 0, properties= None)
+        spy.assert_not_called()
-        await m.dispatch_msg(msg)
+    
+        await m.receive(topic= 'tsun/inv_1/modbus_read_regs', payload= b'0x3000, 10, 7')
         spy.assert_not_called()
 
-        spy.reset_mock()
+        await m.receive(topic= 'tsun/inv_1/dcu_power', payload= b'100W')
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/modbus_read_regs', payload= b'0x3000, 10, 7', qos= 0, retain = False, mid= 0, properties= None)
-        await m.dispatch_msg(msg)
-        spy.assert_not_called()
-
-        spy.reset_mock()
-        msg = aiomqtt.Message(topic= 'tsun/inv_1/dcu_power', payload= b'100W', qos= 0, retain = False, mid= 0, properties= None)
-        await m.dispatch_msg(msg)
         spy.assert_not_called()
 
+        with caplog.at_level(logging.INFO):
+            msg = aiomqtt.Message(topic= 'tsun/inv_1/out_coeff', payload= b'2', qos= 0, retain = False, mid= 0, properties= None)
+            for _ in m.each_inverter(msg, "addr"):
+                pass  # do nothing here
+        assert 'Cmd not supported by: inv_1/' in caplog.text
+    except MqttError:
+        assert False
+    except Exception:
+        assert False          
     finally:
         await m.close()