Add start/stop test

tests/mqtt/protocol/test_handler.py

@@ -6,6 +6,7 @@ import asyncio
 from hbmqtt.plugins.manager import PluginManager
 from hbmqtt.session import Session
 from hbmqtt.mqtt.protocol.handler import ProtocolHandler
+from hbmqtt.adapters import BufferReader, BufferWriter
 
 
 class ProtocolHandlerTest(unittest.TestCase):
@@ -22,3 +23,20 @@ class ProtocolHandlerTest(unittest.TestCase):
         self.assertFalse(handler._pubrec_waiters)
         self.assertFalse(handler._pubrel_waiters)
         self.assertFalse(handler._pubcomp_waiters)
+
+    def test_start_stop(self):
+        @asyncio.coroutine
+        def server_coro(reader, writer):
+            pass
+
+        @asyncio.coroutine
+        def test_coro():
+            s = Session()
+            buffer = b''
+            s.reader = BufferReader(buffer)
+            s.writer = BufferWriter(buffer)
+            handler = ProtocolHandler(s, self.plugin_manager, loop=self.loop)
+            yield from handler.start()
+            yield from handler.stop()
+            return handler
+        handler = self.loop.run_until_complete(test_coro())