Trouble Testing Asynchronous Functions in Vue 3 Composition API with Vitest
I'm stuck on something that should probably be simple... I'm confused about I'm collaborating on a project where Could someone explain I'm currently working on a Vue 3 application that utilizes the Composition API, and I'm having trouble testing asynchronous functions using Vitest. My function fetches data from an API and updates a reactive property, but the test doesn't seem to wait for the asynchronous operation to complete before making assertions. Here's a simplified version of my setup: ```javascript // useData.js import { ref } from 'vue'; export function useData() { const data = ref(null); const fetchData = async () => { const response = await fetch('https://api.example.com/data'); data.value = await response.json(); }; return { data, fetchData }; } ``` And here’s how I’m attempting to test it: ```javascript // useData.spec.js import { useData } from './useData'; import { describe, it, expect, beforeEach } from 'vitest'; describe('useData', () => { let data; let fetchData; beforeEach(() => { ({ data, fetchData } = useData()); }); it('fetches data correctly', async () => { await fetchData(); expect(data.value).toBeDefined(); expect(data.value).toHaveProperty('someExpectedProperty'); }); }); ``` When I run the test, it fails with the behavior message: `Expected value to be defined, but received undefined`. It seems that the assertion runs before the `fetchData` completes. I've tried using `await` in front of `fetchData` as shown, but it still doesn't work. I also ensured that Vitest is set up correctly to handle async tests by checking the configuration. Is there something I'm missing, or is there a better way to handle this situation in Vitest? Any tips on making sure the async function completes before making assertions would be greatly appreciated! I'm using Javascript 3.10 in this project. I'm working on a web app that needs to handle this. Am I missing something obvious? My development environment is macOS. Thanks for your help in advance! Any ideas how to fix this?