Files
Adam Perry @ OpenAI 922249310f test: add TestAppServer builder (#31425)
## Why

Test callers need one composable way to create app-server fixtures
instead of a growing family of overlapping constructor implementations.

## What

- add a feature-complete TestAppServer::builder()
- make the default builder own a temporary CODEX_HOME and select the
automatic test environment
- expose builder knobs for no automatic environment, explicit
CODEX_HOME, program, arguments, plugin startup tasks, environment
overrides, managed config, and JSON logging
- keep the existing public constructor surface, but route every
constructor through the builder so the new path is exercised immediately
- remove the redundant private constructor ladders; caller migration and
public constructor removal live in the optional cleanup stack

## Validation

- just test -p codex-app-server (940/941 before updating the expected
builder error wording)
- just test -p codex-app-server
auto_env_rejects_explicit_environment_config
- just fix -p codex-app-server
- just fmt

## Follow-up stacks

Cleanup, optional for the benchmark work:

1. [#31451 test: migrate TestAppServer callers to
builder](https://github.com/openai/codex/pull/31451)
2. [#31452 test: remove TestAppServer
constructors](https://github.com/openai/codex/pull/31452)

Benchmark infrastructure:

1. [#31427 test: add delayed exec-server
transport](https://github.com/openai/codex/pull/31427)
2. [#31295 bench: add cold skill load
macrobenchmark](https://github.com/openai/codex/pull/31295)
3. [#31428 bench: add e2e benchmark
entrypoints](https://github.com/openai/codex/pull/31428)
4. [#31429 ci: smoke Bazel e2e
benchmarks](https://github.com/openai/codex/pull/31429)
2026-07-07 22:20:48 +00:00
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