use spread syntax

Author: 38elements

packages/create-instance/create-instance.js

@@ -67,7 +67,7 @@ export default function createInstance (
       vm._renderProxy._t = function (name, feedback, props, bindObject) {
         const scopedSlotFn = vm.$_vueTestUtils_scopedSlots[name]
         if (scopedSlotFn) {
-          props = Object.assign({}, bindObject, props)
+          props = { ...bindObject, ...props }
           vm._renderProxy.props = props
           return scopedSlotFn.call(vm._renderProxy)
         } else {