We write and run tests to build trust in our code changes. But maybe tests aren’t the only way to achieve that trust. When I was younger, I had a friend who wa

We write and run tests to build trust in our code changes. But maybe tests aren’t the only way to achieve that trust. When I was younger, I had a friend who was a senior software engineer. I remember he would make changes to production systems without even running the application locally or executing any tests, and yet his changes never failed. The team had a high level of trust in all his code changes.