codex/codex-rs/app-server/tests/suite/v2/auto_env.rs

use anyhow::Context;
use anyhow::Result;
use app_test_support::TestAppServer;
use app_test_support::to_response;
use app_test_support::write_mock_responses_config_toml;
use codex_app_server_protocol::JSONRPCResponse;
use codex_app_server_protocol::RequestId;
use codex_app_server_protocol::ThreadStartParams;
use codex_app_server_protocol::ThreadStartResponse;
use codex_app_server_protocol::TurnStartParams;
use codex_app_server_protocol::UserInput as V2UserInput;
use core_test_support::responses;
use pretty_assertions::assert_eq;
use std::collections::BTreeMap;
use std::time::Duration;
use tempfile::TempDir;
use tokio::time::timeout;

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

#[tokio::test]
async fn thread_start_with_auto_env_exposes_fixture_cwd_to_model() -> Result<()> {
    let server = responses::start_mock_server().await;
    let response_mock = responses::mount_sse_once(
        &server,
        responses::sse(vec![
            responses::ev_response_created("resp-1"),
            responses::ev_assistant_message("msg-1", "done"),
            responses::ev_completed("resp-1"),
        ]),
    )
    .await;
    let codex_home = TempDir::new()?;
    write_mock_responses_config_toml(
        codex_home.path(),
        &server.uri(),
        &BTreeMap::new(),
        /*auto_compact_limit*/ 100_000,
        /*requires_openai_auth*/ None,
        "mock_provider",
        "compact",
    )?;

    let mut mcp = TestAppServer::builder()
        .with_codex_home(codex_home.path())
        .build()
        .await?;
    timeout(DEFAULT_READ_TIMEOUT, mcp.initialize()).await??;
    let expected_environment = mcp.auto_env_params()?;

    let err = mcp
        .send_thread_start_request_with_auto_env(ThreadStartParams {
            environments: Some(Vec::new()),
            ..Default::default()
        })
        .await
        .expect_err("the auto-env helper should reject caller-supplied environments");
    assert_eq!(
        err.to_string(),
        "send_thread_start_request_with_auto_env requires params.environments to be omitted"
    );

    let request_id = mcp
        .send_thread_start_request_with_auto_env(ThreadStartParams::default())
        .await?;
    let response: JSONRPCResponse = timeout(
        DEFAULT_READ_TIMEOUT,
        mcp.read_stream_until_response_message(RequestId::Integer(request_id)),
    )
    .await??;
    let ThreadStartResponse { thread, .. } = to_response::<ThreadStartResponse>(response)?;

    let request_id = mcp
        .send_turn_start_request(TurnStartParams {
            thread_id: thread.id,
            input: vec![V2UserInput::Text {
                text: "report the current directory".to_string(),
                text_elements: Vec::new(),
            }],
            ..Default::default()
        })
        .await?;
    let _: JSONRPCResponse = timeout(
        DEFAULT_READ_TIMEOUT,
        mcp.read_stream_until_response_message(RequestId::Integer(request_id)),
    )
    .await??;

    timeout(
        DEFAULT_READ_TIMEOUT,
        mcp.read_stream_until_notification_message("turn/completed"),
    )
    .await??;

    let environment_context = response_mock
        .single_request()
        .message_input_texts("user")
        .into_iter()
        .find(|text| text.starts_with("<environment_context>"))
        .context("environment context should be model visible")?;
    let model_cwd = environment_context
        .lines()
        .find(|line| line.trim_start().starts_with("<cwd>"))
        .map(str::trim);
    let expected_cwd = format!("<cwd>{}</cwd>", expected_environment.cwd);
    assert_eq!(model_cwd, Some(expected_cwd.as_str()));

    Ok(())
}

#[tokio::test]
async fn auto_env_rejects_explicit_environment_config() -> Result<()> {
    let codex_home = TempDir::new()?;
    std::fs::write(codex_home.path().join("environments.toml"), "")?;

    let result = TestAppServer::builder()
        .with_codex_home(codex_home.path())
        .build()
        .await;
    let Err(err) = result else {
        anyhow::bail!("auto-env construction unexpectedly succeeded");
    };
    assert_eq!(
        err.to_string(),
        format!(
            "automatic environment cannot be used when {} exists",
            codex_home.path().join("environments.toml").display()
        )
    );

    Ok(())
}