fix test

Author: DouweM

tests/test_mcp.py

@@ -1491,9 +1491,9 @@ async def test_server_info(mcp_server: MCPServerStdio) -> None:
         assert mcp_server.server_info.name == 'Pydantic AI MCP Server'
 
 
-async def test_agent_run_stream_with_mcp_server_http(allow_model_requests: None):
+async def test_agent_run_stream_with_mcp_server_http(allow_model_requests: None, model: Model):
     server = MCPServerStreamableHTTP(url='https://mcp.deepwiki.com/mcp', timeout=30)
-    agent = Agent(model='openai:gpt-4o', toolsets=[server], instructions='Be concise.')
+    agent = Agent(model, toolsets=[server], instructions='Be concise.')
 
     # This should not raise an error.
     # See https://github.com/pydantic/pydantic-ai/issues/2818#issuecomment-3476480829