If you look at this quote one the article: “That same story happened so many different times,” my old boss David told me. “Someone launched a small, relatively

If you look at this quote one the article: “That same story happened so many different times,” my old boss David told me. “Someone launched a small, relatively innocuous change that did one of the millions of unexpected things it could have done, which then happened to break some part of the site, and then bring it all down—sometimes bring it down to the point where we couldn’t recover it for hours.” That’s exactly the problem that thorough automated test suites try to solve. When you have a robust mix of unit, integration, end-to-end and performance tests, you can greatly reduce the number of unintended regressions that make it into production. Not eliminate them completely, but definitely reduce them a tonne.