What to Test, and How Much — The Trap of 100% Coverage
This is Part 2 of the “Frontend Testing, Done Right” series. Browse the full series · Glossary Last time we talked about why testing matters. Now for the practical question: “So… what do I test, and how much?” Time is finite, and you can’t test everything. This installment is really one question, answered in three pieces: how to pick the code that’s most worth testing what coverage numbers really mean — and where they lie the testing strategy we’ll use for our demo app A diagram contrasting a perfect coverage number with a test that verifies nothing — visited is not the same as verified What to test first Not all code carries the same weight. Top priority goes to code that changes often and hurts badly when it breaks. ...