test: add example fixture with @nuxt/content (#631)

examples/content/app.vue

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+<template>
+  <div>Index page</div>
+  <div>title: {{ posts[0].title }}</div>
+</template>
+
+<script setup lang="ts">
+definePageMeta({
+  value: 'set in index'
+})
+const posts = await queryContent('/').limit(1).find()
+</script>

examples/content/content/index.md

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+# Nuxt Content
+
+This page corresponds to the `/` route of your website. You can delete it or create another file in the `content/` directory.
+
+Try to navigate to [/about](/about). These 2 pages are rendered by the `pages/[...slug].vue` component.
+
+---
+
+Look at the [Content documentation](https://content.nuxtjs.org/) to learn more.

examples/content/nuxt.config.ts

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+// https://nuxt.com/docs/api/configuration/nuxt-config
+export default defineNuxtConfig({
+  modules: ['@nuxt/content']
+})

examples/content/package.json

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+{
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "build": "nuxt build",
+    "dev": "nuxt dev",
+    "dev:prepare": "nuxt prepare",
+    "generate": "nuxt generate",
+    "test": "vitest",
+    "preview": "nuxt preview"
+  },
+  "devDependencies": {
+    "@nuxt/content": "^2.9.0",
+    "@nuxt/test-utils": "latest",
+    "nuxt": "^3.8.2",
+    "vitest": "1.0.1"
+  }
+}

examples/content/tests/index.spec.ts

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+import { describe, expect, it } from 'vitest'
+import { mockNuxtImport, mountSuspended } from '@nuxt/test-utils/runtime'
+
+import App from '~/app.vue'
+
+// Example usage: queryContent('/').limit(1).find()
+mockNuxtImport('queryContent', () => (_id: string) => ({
+  limit: (_limit: number) => ({
+    find: () => [{
+      title: 'My page'
+    }]
+  })
+}))
+
+describe('test utils', () => {
+  it('can mount components within nuxt suspense', async () => {
+    const component = await mountSuspended(App)
+    expect(component.html()).toMatchInlineSnapshot(`
+      "<div>Index page</div>
+      <div>title: My page</div>"
+    `)
+  })
+})

examples/content/tsconfig.json

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+{
+  // https://v3.nuxtjs.org/concepts/typescript
+  "extends": "./.nuxt/tsconfig.json"
+}

examples/content/vitest.config.ts

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+import { defineVitestConfig } from '@nuxt/test-utils/config'
+
+export default defineVitestConfig({
+  test: {
+    environment: 'nuxt'
+  },
+})