implementing Asynchronous Unit Tests in Vue 3 Using Jest and Vue Test Utils
I keep running into I've searched everywhere and can't find a clear answer. I'm working with issues with testing a component that makes an asynchronous API call using Vue 3, Jest, and Vue Test Utils. My component fetches user data when mounted, and I want to ensure the test verifies that the data is displayed correctly once the API call resolves. However, I keep running into a timeout behavior, and Jest seems to not wait for the promise to resolve before checking assertions. Here’s a simplified version of my component: ```javascript <template> <div v-if="user"> <h1>{{ user.name }}</h1> <p>{{ user.email }}</p> </div> </template> <script> import axios from 'axios'; export default { data() { return { user: null }; }, async mounted() { const response = await axios.get('https://api.example.com/user/1'); this.user = response.data; } }; </script> ``` And here’s the related test: ```javascript import { mount } from '@vue/test-utils'; import UserComponent from '@/components/UserComponent.vue'; import axios from 'axios'; jest.mock('axios'); test('displays user data after API call', async () => { const userData = { name: 'John Doe', email: 'john@example.com' }; axios.get.mockResolvedValue({ data: userData }); const wrapper = mount(UserComponent); // Wait for the next tick to ensure the API call resolves await wrapper.vm.$nextTick(); // Here, I expect the user data to be rendered expect(wrapper.text()).toContain('John Doe'); expect(wrapper.text()).toContain('john@example.com'); }); ``` When I run the test, I get the following behavior: ``` Timeout - Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout. ``` I’ve tried using `await wrapper.vm.$nextTick();`, but it still times out. Should I be using some other pattern or method to wait for the promise to resolve? Is there something I’m missing in my test setup? Any help would be appreciated! My development environment is Windows. What am I doing wrong? This is part of a larger web app I'm building. The project is a service built with Javascript. Thanks for taking the time to read this!