fix: throw error if functional find not supported

closes #296

Author: eddyerburgh

Diff for: src/lib/consts.js

@@ -1,4 +1,8 @@
+import Vue from 'vue'
+
 export const NAME_SELECTOR = 'NAME_SELECTOR'
 export const COMPONENT_SELECTOR = 'COMPONENT_SELECTOR'
 export const REF_SELECTOR = 'REF_SELECTOR'
 export const DOM_SELECTOR = 'DOM_SELECTOR'
+export const VUE_VERSION = Number(`${Vue.version.split('.')[0]}.${Vue.version.split('.')[1]}`)
+export const FUNCTIONAL_OPTIONS = VUE_VERSION >= 2.5 ? 'fnOptions' : 'functionalOptions'

Diff for: src/lib/find-vue-components.js

@@ -1,7 +1,12 @@
 // @flow
 import {
-  COMPONENT_SELECTOR
+  COMPONENT_SELECTOR,
+  FUNCTIONAL_OPTIONS,
+  VUE_VERSION
 } from './consts'
+import {
+    throwError
+} from './util'
 
 function findAllVueComponentsFromVm (
   vm: Component,
@@ -35,7 +40,7 @@ function findAllFunctionalComponentsFromVnode (
   vnode: Component,
   components: Array<Component> = []
 ): Array<Component> {
-  if (vnode.fnOptions) {
+  if (vnode[FUNCTIONAL_OPTIONS] || vnode.functionalContext) {
     components.push(vnode)
   }
   if (vnode.children) {
@@ -61,11 +66,15 @@ export function vmCtorMatchesSelector (component: Component, selector: Object) {
 }
 
 export function vmFunctionalCtorMatchesSelector (component: VNode, Ctor: Object) {
-  if (!component.fnOptions) {
+  if (VUE_VERSION < 2.3) {
+    throwError('find for functional components is not support in Vue < 2.3')
+  }
+
+  if (!component[FUNCTIONAL_OPTIONS]) {
     return false
   }
-  const Ctors = Object.keys(component.fnOptions._Ctor)
-  return Ctors.some(c => Ctor[c] === component.fnOptions._Ctor[c])
+  const Ctors = Object.keys(component[FUNCTIONAL_OPTIONS]._Ctor)
+  return Ctors.some(c => Ctor[c] === component[FUNCTIONAL_OPTIONS]._Ctor[c])
 }
 
 export default function findVueComponents (
@@ -74,10 +83,10 @@ export default function findVueComponents (
   selector: Object
 ): Array<Component> {
   if (selector.functional) {
-    const components = root._vnode
+    const nodes = root._vnode
     ? findAllFunctionalComponentsFromVnode(root._vnode)
     : findAllFunctionalComponentsFromVnode(root)
-    return components.filter(component => vmFunctionalCtorMatchesSelector(component, selector._Ctor))
+    return nodes.filter(node => vmFunctionalCtorMatchesSelector(node, selector._Ctor))
   }
   const components = root._isVue
     ? findAllVueComponentsFromVm(root)

Diff for: test/unit/specs/mount/Wrapper/find.spec.js

@@ -8,7 +8,7 @@ import ComponentWithVFor from '~resources/components/component-with-v-for.vue'
 import Component from '~resources/components/component.vue'
 import FunctionalComponent from '~resources/components/functional-component.vue'
 import ComponentAsAClass from '~resources/components/component-as-a-class.vue'
-import { functionalSFCsSupported } from '~resources/test-utils'
+import { functionalSFCsSupported, vueVersion } from '~resources/test-utils'
 
 describe('find', () => {
   it('returns a Wrapper matching tag selector passed', () => {
@@ -141,6 +141,28 @@ describe('find', () => {
     expect(wrapper.find(FunctionalComponent).vm).to.equal(undefined)
   })
 
+  it('returns Wrapper of Vue Component matching functional component with name', () => {
+    const TestFunctionalComponent = {
+      render: h => h('div'),
+      functional: true,
+      name: 'test-functional-component'
+    }
+    const TestComponent = {
+      template: '<div><test-functional-component /></div>',
+      components: {
+        TestFunctionalComponent
+      }
+    }
+    const wrapper = mount(TestComponent)
+    if (vueVersion < 2.3) {
+      const message = '[vue-test-utils]: find for functional components is not support 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('returns correct number of Vue Wrappers when component has a v-for', () => {
     const items = [{ id: 1 }, { id: 2 }, { id: 3 }]
     const wrapper = mount(ComponentWithVFor, { propsData: { items }})