By creating fast feedback loops at every step of the process, everyone can immediately see the effects of their actions. Whenever changes are committed into version control, fast automated tests are run in production-like environments, giving continual assurance that the code and environments operate as designed and are always in a secure and deployable state. Automated testing helps developers discover their mistakes quickly (usually within minutes), which enables faster fixes as well as genuine learning—learning that is impossible when mistakes are discovered six months later during
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