Add AsyncDataverseClient context= kwarg tests

Mirror TestOperationContextClient from test_operation_context.py:
- context= kwarg stores OperationContext in _config
- no context= leaves operation_context as None
- config= + context= together raise ValueError
- config= alone wires operation_context correctly

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Abel Milash

tests/unit/aio/test_async_client.py

@@ -13,6 +13,7 @@
 from PowerPlatform.Dataverse.aio.operations.async_files import AsyncFileOperations
 from PowerPlatform.Dataverse.aio.operations.async_dataframe import AsyncDataFrameOperations
 from PowerPlatform.Dataverse.aio.operations.async_batch import AsyncBatchOperations
+from PowerPlatform.Dataverse.core.config import DataverseConfig, OperationContext
 
 
 def _make_credential() -> MagicMock:
@@ -204,3 +205,37 @@ async def test_scoped_odata_raises_when_closed(self):
         with pytest.raises(RuntimeError, match="closed"):
             async with client._scoped_odata():
                 pass
+
+
+class TestAsyncDataverseClientOperationContext:
+    """Tests for the context= kwarg on AsyncDataverseClient."""
+
+    def test_context_kwarg_sets_config(self):
+        """context= stores OperationContext in _config.operation_context."""
+        ctx = OperationContext(user_agent_context="app=test/1.0;agent=claude-code")
+        client = AsyncDataverseClient("https://org.crm.dynamics.com", _make_credential(), context=ctx)
+        assert client._config.operation_context.user_agent_context == "app=test/1.0;agent=claude-code"
+
+    def test_no_context_leaves_config_default(self):
+        """Without context=, operation_context defaults to None."""
+        client = AsyncDataverseClient("https://org.crm.dynamics.com", _make_credential())
+        assert client._config.operation_context is None
+
+    def test_config_and_context_raises(self):
+        """Providing both config= and context= raises ValueError."""
+        ctx = OperationContext(user_agent_context="app=test/1.0")
+        config = DataverseConfig(operation_context=ctx)
+        with pytest.raises(ValueError, match="config.*context|context.*config"):
+            AsyncDataverseClient(
+                "https://org.crm.dynamics.com",
+                _make_credential(),
+                config=config,
+                context=OperationContext(user_agent_context="app=other/2.0"),
+            )
+
+    def test_config_alone_works(self):
+        """Providing config= without context= uses config's operation_context."""
+        ctx = OperationContext(user_agent_context="app=test/1.0;skill=dv")
+        config = DataverseConfig(operation_context=ctx)
+        client = AsyncDataverseClient("https://org.crm.dynamics.com", _make_credential(), config=config)
+        assert client._config.operation_context.user_agent_context == "app=test/1.0;skill=dv"