dosubot[bot]
commented
2 months ago Hey @Nojusle! I'm a bot that can help you solve bugs, answer questions, and become a contributor. I'm here to help you while waiting for a human maintainer.
To resolve the issue of the $style attribute being undefined when testing components that use CSS Modules in your Nuxt 3 project, you need to ensure that the @nuxt/test-utils/module is properly loaded and configured in your nuxt.config file.
Here are the key steps:
- Ensure that
@nuxt/test-utils/moduleis added to themodulesarray in yournuxt.configfile:
// nuxt.config.js
export default {
modules: [
'@nuxt/test-utils/module',
// other modules
],
// other configurations
}- Use the
startNuxtAndGetViteConfigfunction to start Nuxt and get the Vite configuration, which includes the necessary setup for handling CSS Modules:
import { startNuxtAndGetViteConfig } from './path/to/config';
async function setup() {
const { nuxt, viteConfig } = await startNuxtAndGetViteConfig();
// additional setup if needed
}
setup();By ensuring that the @nuxt/test-utils/module is properly loaded and configured, the $style attribute should be correctly defined when testing components that use CSS Modules [1].
Additionally, you can mock the $style attribute in your tests to avoid it being undefined. Here is an example of how to mock a component with CSS Modules:
import { mockComponent } from '@nuxt/test-utils/runtime'
// Mock the component and its styles
mockComponent('MyComponent', {
props: {
value: String
},
setup(props) {
return {
$style: {
myClass: 'mocked-class'
}
}
}
})
// Now you can write your tests
import { mountSuspended } from '@nuxt/test-utils/runtime'
import { it, expect } from 'vitest'
import MyComponent from '~/components/MyComponent.vue'
it('renders with mocked styles', async () => {
const component = await mountSuspended(MyComponent)
expect(component.vm.$style.myClass).toBe('mocked-class')
})In this example, the $style attribute is mocked to return a predefined class name, ensuring that it is not undefined during the tests [2].
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robm-masabi
Nojusle
Environment
Reproduction
https://codesandbox.io/p/devbox/nuxt-test-with-css-modules-sz2wlg?file=%2Fsandbox.config.json%3A4%2C25-4%2C37
Describe the bug
When running tests on components that uses CSS Modules, the $style attribute is consistently set to undefined, causing the tests to fail.
Additional context
There are no examples in the Nuxt test examples folder that include CSS modules. I've read the documentation for @nuxt/test-utils, and it doesn't mention how to use it with CSS modules. I tried googling it, but I couldn't find any information on how to test Vue components with CSS modules. I only found an unanswered question regarding the same issue, e.g., https://github.com/nuxt/test-utils/discussions/804. Since CSS modules work with Nuxt 'out of the box,' I believe testing components that use CSS modules should also work seamlessly.
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