From 0ff055c81e38867423399361a216961694350507 Mon Sep 17 00:00:00 2001
From: Thorsten Luenborg <t.luenborg@googlemail.com>
Date: Fri, 26 Nov 2021 08:52:16 +0100
Subject: [PATCH] test: Add test case

---
 packages/vue-compat/__tests__/global.spec.ts | 22 ++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/packages/vue-compat/__tests__/global.spec.ts b/packages/vue-compat/__tests__/global.spec.ts
index 86bb4391092..06109a67f64 100644
--- a/packages/vue-compat/__tests__/global.spec.ts
+++ b/packages/vue-compat/__tests__/global.spec.ts
@@ -285,6 +285,28 @@ describe('GLOBAL_PROTOTYPE', () => {
     delete Vue.prototype.$test
   })
 
+  test.only('functions keeps additional properties', () => {
+    function test(this: any) {
+      return this.msg
+    }
+    test.additionalFn = () => {
+      return 'additional fn'
+    }
+
+    Vue.prototype.$test = test
+    const vm = new Vue({
+      data() {
+        return {
+          msg: 'test'
+        }
+      }
+    }) as any
+    expect(typeof vm.$test).toBe('function')
+    expect(typeof vm.$test.additionalFn).toBe('function')
+    expect(vm.$test.additionalFn()).toBe('additional fn')
+    delete Vue.prototype.$test
+  })
+
   test('extended prototype', async () => {
     const Foo = Vue.extend()
     Foo.prototype.$test = 1