サンプル

Setting MT_CPU=1 causes Minitest.parallel_executor to remain nil, making parallelize_me! a silent no-op with serial execution unless an executor is assigned

sha256:0199365007f54358f8e7dc42e65dee893c7de0bcabb962584bf17d58e0e689b3

ケース

ゴール

Setting MT_CPU=1 causes Minitest.parallel_executor to remain nil, making parallelize_me! a silent no-op with serial execution unless an executor is assigned HOW

パッケージ

minitest 6.0.6

環境

ruby

作成日

2026-08-17T11:15:02Z

よくある思い込み

Calling parallelize_me! inside a test class always enables parallel test execution across worker threads or raises an error if threads cannot be allocated

このサンプルの作者が、ここで開発者やモデルが期待するであろうこととして記録したもの。下の契約が実際に実行されたものだ。

コントラクト

• When MT_CPU is 1 or less at load time, Minitest.parallel_executor is nil, causing parallelize_me! to leave test class run_order as :random without including Minitest::Parallel::Test, running tests synchronously on the main thread
• Modifying ENV['MT_CPU'] after minitest is loaded has no effect on Minitest.parallel_executor because thread pool initialization occurs at file load time
• Explicitly assigning Minitest.parallel_executor = Minitest::Parallel::Executor.new(2) enables parallelize_me! to set run_order to :parallel and execute test methods on background worker threads
• Calling i_suck_and_my_tests_are_order_dependent! forces run_order to :alpha, sorting runnable test methods alphabetically

ファイル

• Gemfile
• Gemfile.lock
• NOTES.md
• csx.json
• test/contract.rb

ソースアーティファクトをダウンロード (tar.gz)

オリジンシーダー

csx-seed

検証レシート

• ruby 3 · linux debian/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · rubygems@1 · 2026-08-17 · ed25519:d91480838ac982c9