Move assertions inside with-block to satisfy coverage.py on 3.11

The test passes on all versions, but coverage.py on 3.11 misreports the
statements after a `with a, b:` + nested `async with` exit as unhit.

Claude-Session: https://claude.ai/code/session_017S3aJaxEHeMvftp6whnHWK

Author: maxisbey

tests/server/test_experimental_streamable_http_modern.py

@@ -183,7 +183,8 @@ async def list_tools(ctx: ServerRequestContext, params: PaginatedRequestParams |
     with anyio.fail_after(5), caplog.at_level(logging.WARNING, logger=modern.__name__):
         async with _asgi_client(Server("test", on_list_tools=list_tools)) as http:
             response = await http.post("/mcp", json=_list_tools_body(), headers={"content-type": "application/json"})
-
-    assert response.status_code == 200
-    assert response.json()["result"]["tools"] == []
-    assert "abandoning remaining callbacks" in caplog.text
+        # Assertions inside the with-block: coverage.py on 3.11 misreports lines after
+        # a `with a, b:` + nested `async with` exit as unhit even when they run.
+        assert response.status_code == 200
+        assert response.json()["result"]["tools"] == []
+        assert "abandoning remaining callbacks" in caplog.text