Vue Testing Bombshell: Skip Proving v-if Works, Test Your Dumb Price Calc Instead – Framework's Job, Not Yours

Unit testing in Vue applications is crucial for protecting business logic, validating critical decision paths, and enabling safe refactoring. The primary purpose of unit tests is not to prove that Vue works, but to ensure that the application's logic is correct and functions as expected. Developers should focus on testing business logic, pure functions, and composables that encapsulate logic, such as data fetching and state machines. Additionally, stores that encode business rules, like actions and getters with logic, should be tested. However, testing Vue internals and framework behavior, such as v-if and v-model, is unnecessary as Vue already guarantees these behaviors. A healthy testing strategy involves unit tests, integration tests, and end-to-end tests, with the goal of achieving maximum confidence per test written, rather than maximum coverage. By testing intentionally, developers can enable confidence and speed in their application development, ultimately leading to faster development and long-term maintainability.