Nuxt•2mo ago

How to mock/test useCookie with Vitest & Vue Test Utils?

Looking to mock or test a cookie that has been set

3 Replies

Hi @polarkarate. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To mock or test useCookie with Vitest and Vue Test Utils, you can use the mockNuxtImport function from @nuxt/test-utils/runtime. This allows you to mock Nuxt's auto-imported composables like useCookie. Here's how you can do it: 1. Import mockNuxtImport: First, import the mockNuxtImport function from @nuxt/test-utils/runtime. 2. Mock useCookie: Use mockNuxtImport to mock the useCookie composable. You can define a mock implementation that returns a specific value for testing purposes. 3. Use vi.hoisted for Dynamic Mocks: If you need to change the mock implementation between tests, use vi.hoisted to create and expose your mocks. This allows you to modify the mock behavior dynamically. 4. Restore Mocks: Ensure you restore mocks before or after each test to maintain test isolation. Here's an example of how you might set this up:

import { vi } from 'vitest'
import { mockNuxtImport } from '@nuxt/test-utils/runtime'

// Create a hoisted mock for useCookie
const { useCookieMock } = vi.hoisted(() => {
  return {
    useCookieMock: vi.fn(() => {
      return { value: 'mocked cookie value' }
    })
  }
})

// Mock the useCookie import
mockNuxtImport('useCookie', () => {
  return useCookieMock
})

// Inside a test, you can change the mock implementation
useCookieMock.mockImplementation(() => {
  return { value: 'another mocked value' }
})

// Remember to restore mocks between tests

import { vi } from 'vitest'
import { mockNuxtImport } from '@nuxt/test-utils/runtime'

// Create a hoisted mock for useCookie
const { useCookieMock } = vi.hoisted(() => {
  return {
    useCookieMock: vi.fn(() => {
      return { value: 'mocked cookie value' }
    })
  }
})

// Mock the useCookie import
mockNuxtImport('useCookie', () => {
  return useCookieMock
})

// Inside a test, you can change the mock implementation
useCookieMock.mockImplementation(() => {
  return { value: 'another mocked value' }
})

// Remember to restore mocks between tests

This setup allows you to test components or functions that rely on useCookie by providing controlled, predictable values. For more details on mocking in Vitest, you can refer to the Vitest documentation. For more information on mockNuxtImport, you can check the Nuxt documentation. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2mo ago

<@1334094586280280108> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

polarkarateOP•2mo ago

Pointed in the right direction anyway

 
beforeEach(() => {
    mockNuxtImport("useCookie", () => () => ({ value: "test-cookie" }));
  });

 
beforeEach(() => {
    mockNuxtImport("useCookie", () => () => ({ value: "test-cookie" }));
  });

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How to mock/test useCookie with Vitest & Vue Test Utils?

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