There's a version of frontend testing that looks great on paper. 100% coverage, unit tests for every function, integration tests for every flow, end-to-end tests for every user journey. I've seen ...

𝗜 𝗠𝗮𝗱𝗲 𝗰𝘀𝘀𝗻𝗮𝗻𝗼 𝟯𝟬% 𝗙𝗮𝘀𝘁𝗲𝗿 I worked on cssnano. It is a CSS minifier. I made it 30% faster. I had one rule. The output must stay the same. The wins came from three changes: - I ...