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commented
3 weeks ago @laura-richer Hello there! I'm here to help you with any issues or questions you have. If you need assistance with bug fixes, answers to technical queries, or want to become a contributor, I'm here for you.
To resolve the issue of Nuxt lifecycle hooks causing your unit tests to timeout, you can mock the lifecycle hooks or the asynchronous operations within them. This will prevent the actual delay from occurring during your tests. Here is an example of how you can mock the setTimeout function in your tests:
jest.useFakeTimers();
test('Nuxt plugin test', async () => {
const plugin = require('path/to/your/plugin').default;
// Mock the setTimeout function
jest.spyOn(global, 'setTimeout').mockImplementation((cb) => cb());
await plugin();
// Restore the original setTimeout function
jest.useRealTimers();
});In this example, jest.useFakeTimers() is used to mock the timer functions, and jest.spyOn(global, 'setTimeout').mockImplementation((cb) => cb()) is used to immediately invoke the callback passed to setTimeout, effectively bypassing the delay. After the test, jest.useRealTimers() is called to restore the original timer functions.
For instance, if you have a Nuxt plugin like this:
export default defineNuxtPlugin(async (_nuxtApp) => {
await new Promise((resolve) => {
setTimeout(resolve, 1000)
})
return {
provide: {
async: {
didInject: true,
},
},
}
})You can apply the same mocking strategy to ensure your tests do not timeout due to the setTimeout delay.
Additionally, you can refer to the Nuxt composables tests for more examples of handling asynchronous operations and lifecycle hooks in tests. For example, the useAsyncData composable is tested with various scenarios including handling errors, immediate execution, and custom cache access:
describe('useAsyncData', () => {
it('should work at basic level', async () => {
const res = useAsyncData(() => Promise.resolve('test'))
expect(Object.keys(res)).toMatchInlineSnapshot(`
[
"data",
"pending",
"error",
"status",
"execute",
"refresh",
"clear",
]
`)
expect(res instanceof Promise).toBeTruthy()
expect(res.data.value).toBe(undefined)
await res
expect(res.data.value).toBe('test')
})
it('should capture errors', async () => {
const { data, error, status, pending } = await useAsyncData('error-test', () => Promise.reject(new Error('test')), { default: () => 'default' })
expect(data.value).toMatchInlineSnapshot('"default"')
expect(error.value).toMatchInlineSnapshot('[Error: test]')
expect(status.value).toBe('error')
expect(pending.value).toBe(false)
})
it('should initialize with error set to null when immediate: false', async () => {
const { error, execute } = useAsyncData(() => Promise.resolve({}), { immediate: false })
expect(error.value).toBe(undefined)
await execute()
expect(error.value).toBe(undefined)
})
})These examples demonstrate how to handle asynchronous operations and ensure your tests do not timeout [1][2][3].
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Environment
Reproduction
https://stackblitz.com/edit/github-kd86ew?file=app.nuxt.test.ts
Command:
npm run testDescribe the bug
I am using Nuxt's page:start lifecycle hook to trigger a ref boolean change
When using the lifecycle hook/defining
const nuxtApp = useNuxtApp()in my component, a unit test that mounts this component times out.This happens regardless of which lifecycle hook is used (page:finish, page:loading:start, app:created).
Results in:
Additional context
No response
Logs
No response