test: fix relative path

vitest.nuxt.config.ts

@@ -1,6 +1,13 @@
+import path from 'node:path'
 import { defineVitestConfig } from '@nuxt/test-utils/config'
 
 export default defineVitestConfig({
+  resolve: {
+    alias: {
+      '~/': path.resolve(__dirname, './'),
+    },
+  },
+
   test: {
     include: ['test/**/*.test.ts'],
     environment: 'nuxt',