I spent a week building a counter program in Anchor — the Rust framework for writing Solana programs. By the end I had two instructions, one authorization constraint, and a test suite I could actually trust. Here is what I built, how I tested it, and the moment I proved the tests were real.
Source: [Dev.to](https://dev.to/lymah/how-i-built-a-counter-program-in-anchor-and-learned-to-trust-my-tests-1akg)