[nuxt] instance is not available in server utils unit tests with useRuntimeConfig()

Environment

• Operating System: Darwin
• Node Version: v20.10.0
• Nuxt Version: 3.13.2
• CLI Version: 3.13.2
• Nitro Version: 2.9.7
• Package Manager: npm@10.2.3
• Builder: -
• User Config: compatibilityDate, devtools, future, experimental, ssr, typescript, routeRules, hooks, runtimeConfig, extends, modules, sourcemap, ui, postcss, tailwindcss, vite, nitro, components, css, imports, content, ogImage, i18n
• Runtime Modules: @nuxt/test-utils/module@3.14.2, @pinia/nuxt@0.5.4, @nuxt/ui@2.18.4, @nuxtjs/i18n@8.5.3, @nuxt/fonts@0.7.2, @vueuse/nuxt@11.0.3, @nuxt/eslint@0.5.7, nuxt-eslint-auto-explicit-import@0.0.2, @nuxt/image@1.8.0, @nuxtjs/fontaine@0.4.3, @nuxt/content@2.13.2, @codecov/nuxt-plugin@1.0.1, @nuxtjs/seo@2.0.0-rc.21
• Build Modules: -

Reproduction

https://stackblitz.com/edit/github-gu1sj1-si6cpn?file=server%2Futils%2Fexample-util.nuxt.spec.ts&startScript=start

Run -> npm run test

Describe the bug

After some recent dependancy upgrades around Nuxt I'm getting the [nuxt] instance unavailable error on tests that call functions in server/utils that use useRuntimeConfig.

See the reproduction link for an example. Thanks.

Additional context

No response

Logs

No response

Start with the StackBlitz reproduction and server/utils/example-util.nuxt.spec.ts, then run npm run test to reproduce the instance-unavailable error. Compare the failing test setup with the server utility's useRuntimeConfig() call; done means the test runs without the [nuxt] instance unavailable error.