fix(create-instance): revert stubbing of component _Ctor (#1479)

Author: kaidjohnson

packages/create-instance/create-component-stubs.js

@@ -86,13 +86,9 @@ function resolveOptions(component, _Vue) {
     return {}
   }
 
-  if (isConstructor(component)) {
-    return component.options
-  }
-  const options = _Vue.extend(component).options
-  component._Ctor = {}
-
-  return options
+  return isConstructor(component)
+    ? component.options
+    : _Vue.extend(component).options
 }
 
 function getScopedSlotRenderFunctions(ctx: any): Array<string> {

packages/create-instance/create-instance.js

@@ -93,7 +93,6 @@ export default function createInstance(
 
   // make sure all extends are based on this instance
   const Constructor = _Vue.extend(componentOptions).extend(instanceOptions)
-  componentOptions._Ctor = {}
   Constructor.options._base = _Vue
 
   const scopedSlots = createScopedSlots(options.scopedSlots, _Vue)

packages/create-instance/patch-create-element.js

@@ -21,7 +21,6 @@ function shouldExtend(component, _Vue) {
 function extend(component, _Vue) {
   const componentOptions = component.options ? component.options : component
   const stub = _Vue.extend(componentOptions)
-  componentOptions._Ctor = {}
   stub.options.$_vueTestUtils_original = component
   stub.options._base = _Vue
   return stub