GETTING FROM TESTED TO BATTLE-TESTED

Summary from the TLDR Dev newsletter

Testing is essential when building reliable software. Being able to show that your code is correct and resilient can be hard, and it takes time to write good tests. In a non-trivial system, tests are an approximation at best, as the real world is messy. Going from being tested to being battle-tested requires learning some things that can only be learned through experience.