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Mastering Vue 3 Composables Testing with Vitest

So you've built some awesome Vue 3 composables that use lifecycle hooks, and now you're scratching your head about how to test them? Don't worry—I've been there too! Testing composables that rely on Vue's lifecycle hooks isn't as straightforward as testing regular JavaScript functions, but with the right approach, it's totally doable. Let's dive into how to properly test these special composables with Vitest! Why Testing Lifecycle Hooks Is Tricky If you've tried something like this: import { useMyComposable } from './useMyComposable'; test('my composable works', () => { const result = useMyComposable(); // Why aren't my onMounted effects running?!

Apr 19, 2025 - 22:17
 0
Mastering Vue 3 Composables Testing with Vitest

So you've built some awesome Vue 3 composables that use lifecycle hooks, and now you're scratching your head about how to test them? Don't worry—I've been there too! Testing composables that rely on Vue's lifecycle hooks isn't as straightforward as testing regular JavaScript functions, but with the right approach, it's totally doable.

Let's dive into how to properly test these special composables with Vitest!

Why Testing Lifecycle Hooks Is Tricky

If you've tried something like this:

import { useMyComposable } from './useMyComposable';

test('my composable works', () => {
  const result = useMyComposable();
  // Why aren't my onMounted effects running?!
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