Error when running tests in VueJS: Unknown custom element:

问题

When I run my Karma/Jasmine tests I get a Error Log in the console after mounting my header component which include <router-link> components. It all run's perfectly fine but just can't seem fix the error that displays. The error is:

ERROR LOG: '[Vue warn]: Unknown custom element: <router-link> - did you register the component correctly? For recursive components, make sure to provide the "name" option. (found in <Header>)'

I have done the old: Vue.use(VueRouter) and am running "vue-router": "^2.4.0",

Any help would be much appreciated 😀

SiteHeader.html

<header class="site-header">
 <div class="site-header__home-btn">
  <router-link to="home">Home</router-link>
 </div>
 <div class="site-header__info-bar">
  Info bar
 </div>
</header>

SiteHeader.vue

<template src="./SiteHeader.html"></template>
<style scoped lang="sass" src="./SiteHeader.scss"></style>

<script>
export default {
 name: 'site-header'
}
</script>

SiteHeader.spec.js

import Vue from 'vue'
import SiteHeader from '../SiteHeader.vue'

describe('SiteHeader', () => {

 /*
  * Template
  *
  */
 describe('Template', () => {
   it('should render a SiteHeader component', () => {
     const vm = new Vue(SiteHeader).$mount()
     expect(vm.$el).toBeTruthy()
   })
 })
})

Full Error:

ERROR LOG: TypeError{stack: 'render@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:33404:21
_render@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:7488:26
updateComponent@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6037:28
get@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6348:29
Watcher@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6331:15
mountComponent@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6041:28
$mount@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:11131:24
$mount@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:13180:20
init@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6810:19
createComponent@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:8535:10
createElm@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:8478:24
createChildren@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:8603:18
createElm@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:8511:23
createChildren@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:8603:18
createElm@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:8511:23
patch@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:8934:16
_update@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:5914:28
updateComponent@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6037:17
get@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6348:29
Watcher@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6331:15
mountComponent@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:6041:28
$mount@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:11131:24
$mount@http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:13180:20
http://localhost:9876/base/index.js?0474196dfad39c6ebb985b02818a594daecdb5f6:42444:62
attemptSync@http://localhost:9876/absolute/Users/user/projects/project/node_modules/jasmine-core/lib/jasmine-core/jasmine.js?916005cc407925f4764668d61d04888d59258f5d:1950:28

回答1:

Amresh Venugopal is mostly right, but You also need to provide vm instance with VueRouter instance (its also important to provide routes config that matches needs of ). Basically issue here is caused because router is undefined. Porper routes config is required, otherwise You will get error that 'home' route is not defined.

import Vue from 'vue'
import SiteHeader from '../SiteHeader.vue'
import VueRouter from 'vue-router'

describe('SiteHeader', () => {
  /**
  * Template
  *
  */
  describe('Template', () => {
    it('should render a SiteHeader component', () => {
      Vue.use(vueRouter)
      const routes = { ... };
      const router = new VueRouter({
        routes,
        // some other config
      });
      vm = new Vue({
        template: '<div><site-header></site-header></div>',
        router: router,
        components: {
            site-header: SiteHeader
        }
      }).$mount()

      // some expects...
    })
  })
})

Hope that helps.

回答2:

Vue natively doesn't have the <router-link> component. It comes along with the vue-router plugin. In your unit-test code, the vue instance doesn't have the vue-router plugin added, leading to the error you are facing.

import Vue from 'vue'
import SiteHeader from '../SiteHeader.vue'
import vueRouter from 'vue-router'

describe('SiteHeader', () => {
  /**
  * Template
  *
  */
  describe('Template', () => {
    it('should render a SiteHeader component', () => {
      Vue.use(vueRouter)
      const vm = new Vue(SiteHeader).$mount()
      expect(vm.$el).toBeTruthy()
    })
  })
})

Now the vm should have access to the <router-link> and <router-view> components.

来源：https://stackoverflow.com/questions/43343317/error-when-running-tests-in-vuejs-unknown-custom-element-router-link

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jasmine