Watchers
Explore how to effectively test watchers in Vue.js components using Jest. Understand when to use watchers, how their update cycle impacts testing, and methods to verify watcher reactions to data changes, including handling asynchronous operations with Vue's nextTick and jest spies.
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There are rare cases where we need to use watchers instead of computed properties. Sometimes watchers are misused as well, which messes things up and results in an unclear data workflow among components. So before using watchers, we should think about their use and suitability.
As we can see in the Vue.js docs, watchers are often used to react to data changes and perform asynchronous operations, such as performing an ajax request.
Testing Watchers
Let’s say we want to do something when the inputValue from the state changes. We could do an ajax request, but since that’s more complicated (as we’ll ...