test: update tests to use invoke_command directly

tests/adapter/test_rpc.py

@@ -1,8 +1,8 @@
 import importlib
-import asyncio
 import sys
 import unittest
-from amqp.service.amq_message_handler import DataMessageHandler
+from amqp.service.amq_message_handler import invoke_command
+
 
 class TestRPCInvocation(unittest.IsolatedAsyncioTestCase):
     """Test cases for the RPC invocation functionality in DataMessageHandler."""
@@ -53,8 +53,7 @@ class MyService:
 
     async def test_invoke_global_sync_function(self):
         """Test invoking a global synchronous function."""
-        result = await DataMessageHandler.invoke_command(
-            package_name="my_package.my_module",
+        result = await invoke_command(
             class_name="__global__",
             function_name="greet_sync",
             kwargs={"name": "Alice"}
@@ -63,8 +62,7 @@ class MyService:
 
     async def test_invoke_global_async_function(self):
         """Test invoking a global asynchronous function."""
-        result = await DataMessageHandler.invoke_command(
-            package_name="my_package.my_module",
+        result = await invoke_command(
             class_name="__global__",
             function_name="greet_async",
             kwargs={"name": "Bob"}
@@ -73,8 +71,7 @@ class MyService:
 
     async def test_invoke_class_sync_method(self):
         """Test invoking a class synchronous method."""
-        result = await DataMessageHandler.invoke_command(
-            package_name="my_package.my_module",
+        result = await invoke_command(
             class_name="MyService",
             function_name="process_data_sync",
             kwargs={"data": "report", "count": 3}
@@ -86,8 +83,7 @@ class MyService:
 
     async def test_invoke_class_async_method(self):
         """Test invoking a class asynchronous method."""
-        result = await DataMessageHandler.invoke_command(
-            package_name="my_package.my_module",
+        result = await invoke_command(
             class_name="MyService",
             function_name="process_data_async",
             kwargs={"data": "metrics", "delay": 0.01}
@@ -100,8 +96,7 @@ class MyService:
     async def test_package_not_found(self):
         """Test error handling when package is not found."""
         with self.assertRaises(ModuleNotFoundError):
-            await DataMessageHandler.invoke_command(
-                package_name="non_existent_package",
+            await invoke_command(
                 class_name="__global__",
                 function_name="some_func",
                 kwargs={}
@@ -110,8 +105,7 @@ class MyService:
     async def test_class_not_found(self):
         """Test error handling when class is not found."""
         with self.assertRaises(AttributeError):
-            await DataMessageHandler.invoke_command(
-                package_name="my_package.my_module",
+            await invoke_command(
                 class_name="NonExistentClass",
                 function_name="some_method",
                 kwargs={}
@@ -120,8 +114,7 @@ class MyService:
     async def test_method_not_found(self):
         """Test error handling when method is not found."""
         with self.assertRaises(AttributeError):
-            await DataMessageHandler.invoke_command(
-                package_name="my_package.my_module",
+            await invoke_command(
                 class_name="MyService",
                 function_name="non_existent_method",
                 kwargs={}
@@ -129,8 +122,7 @@ class MyService:
 
     async def test_private_method_access(self):
         """Test that private methods can be accessed (Python doesn't enforce privacy)."""
-        result = await DataMessageHandler.invoke_command(
-            package_name="my_package.my_module",
+        result = await invoke_command(
             class_name="MyService",
             function_name="_private_method",
             kwargs={}