codex/codex-rs/app-server/tests/suite/user_agent.rs

use anyhow::Result;
use app_test_support::{McpProcess, to_response};
use codex_app_server_protocol::{GetUserAgentResponse, JSONRPCResponse, RequestId};
use pretty_assertions::assert_eq;
use tempfile::TempDir;
use tokio::time::timeout;

const DEFAULT_READ_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(10);

#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn get_user_agent_returns_current_codex_user_agent() -> Result<()> {
    let codex_home = TempDir::new()?;

    let mut mcp = McpProcess::new(codex_home.path()).await?;
    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;

    let request_id = mcp.send_get_user_agent_request().await?;
    let response: JSONRPCResponse = timeout(
        DEFAULT_READ_TIMEOUT,
        mcp.read_stream_until_response_message(RequestId::Integer(request_id)),
    )
    .await??;

    let os_info = os_info::get();
    let user_agent = format!(
        "codex_cli_rs/0.0.0 ({} {}; {}) {} (codex-app-server-tests; 0.1.0)",
        os_info.os_type(),
        os_info.version(),
        os_info.architecture().unwrap_or("unknown"),
        codex_core::terminal::user_agent()
    );

    let received: GetUserAgentResponse = to_response(response)?;
    let expected = GetUserAgentResponse { user_agent };

    assert_eq!(received, expected);
    Ok(())
}