This post emphasizes the relationship between testing and continuous delivery. Product teams should always run tests to ensure quality, as stated in the article:
There is only a single path to production for any code change, no matter how critical. We always use our emergency process and we always test the same way.
Gone are the days of SSHing into production, changing the live code, and restarting the server 🙂 After describing why tests are the gateway to CI/CD, the post details the types of tests you need in your suite.