Method name is _decode_payload not _decode_messages

salt/channel/client.py

@@ -360,7 +360,7 @@ class AsyncPubChannel:
 
     async_methods = [
         "connect",
-        "_decode_messages",
+        "_decode_payload",
     ]
     close_methods = [
         "close",

tests/pytests/unit/channel/test_client.py

@@ -0,0 +1,19 @@
+import salt.channel.client
+
+
+def test_async_methods():
+    "Validate all defined async_methods and close_methods are present"
+    async_classes = [
+        salt.channel.client.AsyncReqChannel,
+        salt.channel.client.AsyncPubChannel,
+    ]
+    method_attrs = [
+        "async_methods",
+        "close_methods",
+    ]
+    for cls in async_classes:
+        for attr in method_attrs:
+            assert hasattr(cls, attr)
+            assert isinstance(getattr(cls, attr), list)
+            for name in getattr(cls, attr):
+                assert hasattr(cls, name)