fix(mountSuspended): define $attrs in component render context

examples/app-vitest-full/components/ComponentWithAttrs.vue

@@ -0,0 +1,9 @@
+<template>
+  <span v-bind="$attrs" />
+</template>
+
+<script setup lang="ts">
+defineOptions({
+  inheritAttrs: false,
+})
+</script>

examples/app-vitest-full/tests/nuxt/mount-suspended.spec.ts

@@ -14,6 +14,7 @@ import ExportDefineComponent from '~/components/ExportDefineComponent.vue'
 import ExportDefaultWithRenderComponent from '~/components/ExportDefaultWithRenderComponent.vue'
 import ExportDefaultReturnsRenderComponent from '~/components/ExportDefaultReturnsRenderComponent.vue'
 import OptionsApiPage from '~/pages/other/options-api.vue'
+import ComponentWithAttrs from '~/components/ComponentWithAttrs.vue'
 import ComponentWithReservedProp from '~/components/ComponentWithReservedProp.vue'
 import ComponentWithReservedState from '~/components/ComponentWithReservedState.vue'
 import ComponentWithImports from '~/components/ComponentWithImports.vue'
@@ -159,6 +160,11 @@ describe('mountSuspended', () => {
     expect(span.text()).toBe('false')
   })
 
+  it('should define $attrs', async () => {
+    const component = await mountSuspended(ComponentWithAttrs, { attrs: { foo: 'bar' } })
+    expect(component.find('[foo="bar"]').exists()).toBe(true)
+  })
+
   describe('Options API', () => {
     beforeEach(() => {
       vi.spyOn(console, 'error').mockImplementation((message) => {

src/runtime-utils/mount.ts

@@ -182,6 +182,7 @@ export async function mountSuspended<T>(
           _options,
           {
             slots,
+            attrs,
             global: {
               config: {
                 globalProperties: vueApp.config.globalProperties,