fix(stubs): avoid warning on normalized props with Vue v3.4.22

Fixes #2411

We can "trick" the warning introduced in Vue v3.4.22 (See vuejs/core@7ccd453)
by using an array of strings instead of a string (as the new check allows functions and arrays, but not strings).
This does not affect the rendering of the stub, and still displays `[Function]`, so it should not impact the existing tests.

Author: cexbrayat

src/vnodeTransformers/stubComponentsTransformer.ts

@@ -47,10 +47,10 @@ const normalizeStubProps = (props: ComponentPropsOptions) => {
   const $props = props as unknown as ComponentObjectPropsOptions
   return Object.keys($props).reduce((acc, key) => {
     if (typeof $props[key] === 'symbol') {
-      return { ...acc, [key]: $props[key]?.toString() }
+      return { ...acc, [key]: [$props[key]?.toString()] }
     }
     if (typeof $props[key] === 'function') {
-      return { ...acc, [key]: '[Function]' }
+      return { ...acc, [key]: ['[Function]'] }
     }
     return { ...acc, [key]: $props[key] }
   }, {})

tests/props.spec.ts

@@ -1,4 +1,4 @@
-import { describe, expect, it } from 'vitest'
+import { describe, expect, it, vi } from 'vitest'
 import { mount, shallowMount, VueWrapper } from '../src'
 import WithProps from './components/WithProps.vue'
 import PropWithSymbol from './components/PropWithSymbol.vue'
@@ -318,6 +318,20 @@ describe('props', () => {
     expect(wrapper.html()).toBe('<comp-stub fn="[Function]"></comp-stub>')
   })
 
+  // https://github.com/vuejs/test-utils/issues/2411
+  it('should not warn on stringify props in stubs', () => {
+    const spy = vi.spyOn(console, 'warn').mockReturnValue()
+    const Comp = defineComponent({
+      name: 'Comp',
+      template: `<transition @enter="() => {}"></transition>`
+    })
+
+    const wrapper = mount(Comp)
+
+    expect(wrapper.html()).toContain('<transition-stub')
+    expect(spy).not.toHaveBeenCalled()
+  })
+
   describe('edge case with symbol props and stubs', () => {
     it('works with Symbol as default', () => {
       const Comp = defineComponent({