fix: remove cached constructors (#1059)

Author: eddyerburgh

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

@@ -69,7 +69,11 @@ export default function find (
 
   if (
     selector.type === COMPONENT_SELECTOR &&
-    selector.value.functional &&
+    (
+      selector.value.functional ||
+      (selector.value.options &&
+      selector.value.options.functional)
+    ) &&
     vueVersion < 2.3
   ) {
     throwError(

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

@@ -12,27 +12,30 @@ export function vmMatchesName (vm, name) {
 }
 
 function vmCtorMatches (vm, component) {
-  const Ctor = typeof component === 'function'
-    ? component.options._Ctor
-    : component._Ctor
-
   if (
     vm.$options && vm.$options.$_vueTestUtils_original === component ||
     vm.$_vueTestUtils_original === component
   ) {
     return true
   }
 
+  const Ctor = typeof component === 'function'
+    ? component.options._Ctor
+    : component._Ctor
+
   if (!Ctor) {
     return false
   }
 
-  const constructor = vm.constructor
-  return Object.keys(Ctor).some(c => {
-    return component.functional
-      ? Ctor[c] === vm._Ctor[c]
-      : Ctor[c] === constructor
-  })
+  if (vm.constructor.extendOptions === component) {
+    return true
+  }
+
+  if (component.functional) {
+    return Object.keys(vm._Ctor || {}).some(c => {
+      return component === vm._Ctor[c].extendOptions
+    })
+  }
 }
 
 export function matches (node, selector) {

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

@@ -54,5 +54,8 @@ export default function mount (
   const root = vm.$options._isFunctionalContainer
     ? vm._vnode
     : vm
+
+  component._Ctor = []
+
   return createWrapper(root, wrapperOptions)
 }

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

@@ -178,7 +178,7 @@ describeWithShallowAndMount('find', mountingMethod => {
       wrappers.forEach((w, i) => expect(w.classes()).to.contain(expectedClasses[i]))
     })
 
-  it('returns Wrapper of Vue Component matching functional component', () => {
+  it('returns functional component', () => {
     if (!functionalSFCsSupported) {
       return
     }
@@ -199,7 +199,7 @@ describeWithShallowAndMount('find', mountingMethod => {
     expect(wrapper.find(FunctionalComponent).vm).to.equal(undefined)
   })
 
-  it('returns Wrapper of Vue Component matching functional component with name', () => {
+  it('returns functional component with name', () => {
     const TestFunctionalComponent = {
       render: h => h('div'),
       functional: true,
@@ -224,6 +224,30 @@ describeWithShallowAndMount('find', mountingMethod => {
     }
   })
 
+  it('returns extended functional component', () => {
+    const TestFunctionalComponent = Vue.extend({
+      render: h => h('div'),
+      functional: true
+    })
+    const TestComponent = {
+      template: '<div><test-functional-component /></div>',
+      components: {
+        TestFunctionalComponent
+      }
+    }
+    const wrapper = mountingMethod(TestComponent)
+    if (vueVersion < 2.3) {
+      const message =
+        '[vue-test-utils]: find for functional components is not supported in Vue < 2.3'
+      const fn = () => wrapper.find(TestFunctionalComponent)
+      expect(fn)
+        .to.throw()
+        .with.property('message', message)
+    } else {
+      expect(wrapper.find(TestFunctionalComponent).exists()).to.equal(true)
+    }
+  })
+
   it('works correctly with innerHTML', () => {
     const TestComponent = {
       render (createElement) {