実践的なパターン: テストの容易性を高める設計This browser is no longer supported. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. {End Bracket} From Bouncy Balls to Better Estimates James Waletzky Care to guess how many bouncy balls are in the container on my desk? You don't know the size of the balls, the volume of the container, or how full the container is, which makes an educat
