diff --git a/tests/mqtt/test_connect.py b/tests/mqtt/test_connect.py
index 4a2c5b7..9fa18cd 100644
--- a/tests/mqtt/test_connect.py
+++ b/tests/mqtt/test_connect.py
@@ -32,6 +32,26 @@ class ConnectPacketTest(unittest.TestCase):
         self.assertEqual(message.payload.username, 'user')
         self.assertEqual(message.payload.password, 'password')
 
+    def test_decode_ok_will_flag(self):
+        data = b'\x10\x26\x00\x04MQTT\x04\xca\x00\x00\x00\x0a0123456789\x00\x04user\x00\x08password'
+        stream = asyncio.StreamReader(loop=self.loop)
+        stream.feed_data(data)
+        message = self.loop.run_until_complete(ConnectPacket.from_stream(stream))
+        self.assertEqual(message.variable_header.proto_name, "MQTT")
+        self.assertEqual(message.variable_header.proto_level, 4)
+        self.assertTrue(message.variable_header.username_flag)
+        self.assertTrue(message.variable_header.password_flag)
+        self.assertFalse(message.variable_header.will_retain_flag)
+        self.assertEqual(message.variable_header.will_qos, 1)
+        self.assertFalse(message.variable_header.will_flag)
+        self.assertTrue(message.variable_header.clean_session_flag)
+        self.assertFalse(message.variable_header.reserved_flag)
+        self.assertEqual(message.payload.client_id, '0123456789')
+        self.assertEqual(message.payload.will_topic, None)
+        self.assertEqual(message.payload.will_message, None)
+        self.assertEqual(message.payload.username, 'user')
+        self.assertEqual(message.payload.password, 'password')
+
     def test_decode_fail_protocol_name(self):
         data = b'\x10\x3e\x00\x04TTQM\x04\xce\x00\x00\x00\x0a0123456789\x00\x09WillTopic\x00\x0bWillMessage\x00\x04user\x00\x08password'
         stream = asyncio.StreamReader(loop=self.loop)