fix: do not remove cached constructors (#962)

* fix: do not removed cached constructors

* test: fix linting error

Author: eddyerburgh

Diff for: packages/create-instance/create-instance.js

@@ -38,9 +38,6 @@ export default function createInstance (
   options: Options,
   _Vue: Component
 ): Component {
-  // Remove cached constructor
-  delete component._Ctor
-
   // make sure all extends are based on this instance
   _Vue.options._base = _Vue
 

Diff for: packages/server-test-utils/src/renderToString.js

@@ -22,8 +22,6 @@ export default function renderToString (
       `renderToString must be run in node. It cannot be ` + `run in a browser`
     )
   }
-  // Remove cached constructor
-  delete component._Ctor
 
   if (options.attachToDocument) {
     throwError(`you cannot use attachToDocument with ` + `renderToString`)

Diff for: packages/shared/create-component-stubs.js

@@ -149,11 +149,6 @@ export function createStubsFromStubsObject (
       return acc
     }
 
-    if (originalComponents[stubName]) {
-      // Remove cached constructor
-      delete originalComponents[stubName]._Ctor
-    }
-
     if (typeof stub === 'string') {
       acc[stubName] = createStubFromString(
         stub,
@@ -195,8 +190,6 @@ function stubComponents (
       )
       return
     }
-    // Remove cached constructor
-    delete componentOptions._Ctor
 
     stubbedComponents[component] = createStubFromComponent(
       cmp,

Diff for: packages/test-utils/src/mount.js

@@ -25,9 +25,6 @@ export default function mount (
 
   warnIfNoWindow()
 
-  // Remove cached constructor
-  delete component._Ctor
-
   const elm = options.attachToDocument ? createElement() : undefined
 
   const mergedOptions = mergeOptions(options, config)

Diff for: test/specs/wrapper/find.spec.js

@@ -291,16 +291,23 @@ describeWithShallowAndMount('find', mountingMethod => {
     expect(wrapper.find(Component).vnode).to.be.an('object')
   })
 
-  it('returns array of VueWrappers of Vue Components matching component if component name in parent is different to filename', () => {
+  it('returns Wrapper matching selector using Wrapper as reference', () => {
     const wrapper = mountingMethod(ComponentWithChild)
     const div = wrapper.find('span')
     expect(div.find(Component).vnode).to.be.an('object')
   })
 
-  it('returns Wrapper matching selector using Wrapper as reference', () => {
-    const wrapper = mountingMethod(ComponentWithChild)
-    const div = wrapper.find('span')
-    expect(div.find(Component).vnode).to.be.an('object')
+  it('selector works between mounts', () => {
+    const ChildComponent = { template: '<div />' }
+    const TestComponent = {
+      template: '<child-component />',
+      components: {
+        ChildComponent
+      }
+    }
+    const wrapper = mountingMethod(TestComponent)
+    mountingMethod(ChildComponent)
+    expect(wrapper.find(ChildComponent).vnode).to.be.an('object')
   })
 
   it('returns error Wrapper if Vue component is below Wrapper', () => {