Edit requests of テスト駆動開発どころかユニットテストすらやったことのない初心者が、急に思い立ってPHPUnitでテストコードを書き始めてみた

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We released Markdown parser changes on February 24, 2022. There may be some unexpected appearance changes in this update, because this article was posted before the changes.
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For more information on the changes, please read this article.