Translation guide
A regression test is a test that checks whether previously working software still works after changes. In Japanese, this is usually expressed with the borrowed term リグレッションテスト or the more descriptive 回帰テスト.
A test to ensure existing functionality hasn't broken after code changes.
The most common and direct loanword from English. Widely understood in software development contexts.
リグレッションテストを実施する。
We will run a regression test.
A Japanese-coined term using 回帰 (regression) + テスト (test). Used in technical documentation, but less common in everyday speech than the loanword.
回帰テストの自動化を進めている。
We are promoting automation of regression tests.
An alternative translation using 退行 (regression, going backward). Rarely used; 回帰テスト is preferred.
退行テストは品質保証の一環だ。
Regression testing is part of quality assurance.