Initial import

tests/client/test_session.py

@@ -0,0 +1,93 @@
+import anyio
+import pytest
+
+from mcp_python.client.session import ClientSession
+from mcp_python.types import (
+    ClientNotification,
+    ClientRequest,
+    Implementation,
+    InitializedNotification,
+    InitializeRequest,
+    InitializeResult,
+    JSONRPCMessage,
+    JSONRPCNotification,
+    JSONRPCRequest,
+    JSONRPCResponse,
+    ServerCapabilities,
+    ServerResult,
+)
+
+
+@pytest.mark.anyio
+async def test_client_session_initialize():
+    client_to_server_send, client_to_server_receive = anyio.create_memory_object_stream[
+        JSONRPCMessage
+    ](1)
+    server_to_client_send, server_to_client_receive = anyio.create_memory_object_stream[
+        JSONRPCMessage
+    ](1)
+
+    initialized_notification = None
+
+    async def mock_server():
+        nonlocal initialized_notification
+
+        jsonrpc_request = await client_to_server_receive.receive()
+        assert isinstance(jsonrpc_request.root, JSONRPCRequest)
+        request = ClientRequest.model_validate(
+            jsonrpc_request.model_dump(by_alias=True, mode="json")
+        )
+        assert isinstance(request.root, InitializeRequest)
+
+        result = ServerResult(
+            InitializeResult(
+                protocolVersion=1,
+                capabilities=ServerCapabilities(
+                    logging=None,
+                    resources=None,
+                    tools=None,
+                    experimental=None,
+                    prompts=None,
+                ),
+                serverInfo=Implementation(name="mock-server", version="0.1.0"),
+            )
+        )
+
+        async with server_to_client_send:
+            await server_to_client_send.send(
+                JSONRPCMessage(
+                    JSONRPCResponse(
+                        jsonrpc="2.0",
+                        id=jsonrpc_request.root.id,
+                        result=result.model_dump(by_alias=True, mode="json"),
+                    )
+                )
+            )
+            jsonrpc_notification = await client_to_server_receive.receive()
+            assert isinstance(jsonrpc_notification.root, JSONRPCNotification)
+            initialized_notification = ClientNotification.model_validate(
+                jsonrpc_notification.model_dump(by_alias=True, mode="json")
+            )
+
+    async def listen_session():
+        async for message in session.incoming_messages:
+            if isinstance(message, Exception):
+                raise message
+
+    async with (
+        ClientSession(server_to_client_receive, client_to_server_send) as session,
+        anyio.create_task_group() as tg,
+    ):
+        tg.start_soon(mock_server)
+        tg.start_soon(listen_session)
+        result = await session.initialize()
+
+    # Assert the result
+    assert isinstance(result, InitializeResult)
+    assert result.protocolVersion == 1
+    assert isinstance(result.capabilities, ServerCapabilities)
+    assert result.serverInfo == Implementation(name="mock-server", version="0.1.0")
+
+    # Check that the client sent the initialized notification
+    assert initialized_notification
+    assert isinstance(initialized_notification.root, InitializedNotification)