codex-rewind: Skill for Codex

Remote executor tests exercise the app-server/exec-server split to ensure that agent features work in both local and remote execution environments.

Remote executor tests currently require an x86_64 Linux host machine. There are two flavors:

1. Docker (Linux exec-server)
2. Wine (Windows exec-server)

Test Fixtures

Individual test cases must opt-in to being run against a remote executor.

codex_core

Use TestCodexBuilder::build_with_auto_env() to opt-in to remote execution in core integration tests unless the test needs more precise control over its executor.

app-server

Start the server with TestAppServer::new_with_auto_env() unless the test defines its own $CODEX_HOME/environments.toml or will define custom environments at runtime.

Start threads with TestAppServer::send_thread_start_request_with_auto_env() if you've created the server with the auto_env approach. Omit ThreadStartParams.environments (leave it as None) when doing so.

Test Skips

If a test doesn't pass in a particular remote executor configuration you can skip it in just that configuration. Include a string reason for future readers when the selected skip macro supports one.

Choose the skip macro by what causes the test to fail:

• skip_if_target_windows!: Windows target behavior.
• skip_if_wine_exec!: Wine-exec runner constraints.
• skip_if_host_windows!: Windows host constraints.
• skip_if_remote!: Local-only test behavior.
• skip_if_no_remote_env!: Remote-only test behavior.

Prefer defining tests that run in all host/target configurations by default. See the $path-types skill for the most common changes required to make tests compatible.

Docker

Docker container is built and initialized via ./scripts/test-remote-env.sh. Sourcing this script in bash also provides the codex_remote_env_cleanup function to use after testing.

To run core integration tests against a Docker remote executor:

bash -c '
  set -euo pipefail
  unset CODEX_TEST_REMOTE_EXEC_SERVER_URL
  source scripts/test-remote-env.sh
  trap codex_remote_env_cleanup EXIT

  cd codex-rs
  just test -p codex-core --test all
'