vue.js - [Vue 警告] : Unknown custom element: - When running jest unit tests

Question

问题

我正在使用 nuxt 1.4 和路由，使用 Jest 进行单元测试。我的应用程序没有抛出错误并且似乎运行良好。然而，在运行我的单元测试时 npm run unit (开 Jest )它在终端中抛出错误:[Vue warn]: Unknown custom element: <nuxt-link> - did you register the component correctly? For recursive components, make sure to provide the "name" option.

预期

我希望它不会抛出此错误，因为我的应用程序正在运行。

文件

package.json :

{
  "name": "vue-starter",
  "version": "1.0.0",
  "description": "Nuxt.js project",
  "private": true,
  "scripts": {
    "dev": "nuxt",
    "build": "nuxt build",
    "start": "nuxt start",
    "generate": "nuxt generate",
    "lint": "eslint --ext .js,.vue --ignore-path .gitignore .",
    "precommit": "npm run lint",
    "test": "npm run lint && npm run unit",
    "unit": "jest",
    "unit:report": "jest --coverage"
  },
  "dependencies": {
    "babel-jest": "^22.4.1",
    "jest-serializer-vue": "^1.0.0",
    "node-sass": "^4.7.2",
    "npm": "^5.7.1",
    "nuxt": "^1.0.0",
    "sass-loader": "^6.0.7",
    "vue-jest": "^2.1.1"
  },
  "devDependencies": {
    "@vue/test-utils": "^1.0.0-beta.12",
    "babel-eslint": "^8.2.1",
    "eslint": "^4.15.0",
    "eslint-friendly-formatter": "^3.0.0",
    "eslint-loader": "^1.7.1",
    "eslint-plugin-vue": "^4.0.0",
    "jest": "^22.4.2"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ],
  "jest": {
    "moduleFileExtensions": [
      "js",
      "vue"
    ],
    "transform": {
      "^.+\\.js$": "<rootDir>/node_modules/babel-jest",
      ".*\\.(vue)$": "<rootDir>/node_modules/vue-jest"
    },
    "snapshotSerializers": [
      "<rootDir>/node_modules/jest-serializer-vue"
    ]
  }
}

我测试的组件:

<template>
  <div>
    <nuxt-link class="name" :to="{ path: `entity/${item.id}`, params: { id: item.id }}">{{item.name}}</nuxt-link>
    <button class="connect" @click="connect">{{ btnText }}</button>
  </div>
</template>

<script>
  // import nuxtLink from '../.nuxt/components/nuxt-link';

  const connectionStatusMap = [
    'Connect',
    'Connected',
    'Pending',
    'Cancel',
  ];

  export default {
    /*components: {
      'nuxt-link': nuxtLink,
    },*/
    props: {
      item: {
        type: Object
      }
    },
    ...
  }
</script>

我的测试脚本:

import TestItem from '../components/TestItem';
import { shallow, mount, createLocalVue } from '@vue/test-utils';
import Vuex from 'vuex';
import VueRouter from 'vue-router';

const localVue = createLocalVue()

localVue.use(Vuex)
localVue.use(VueRouter)

...
it(`should show the entity`, () => {
    const wrapper = mount(TestItem, {
      propsData: { item },
      localVue,
      store,
      // stubs: ['nuxt-link'],
    })
    expect(wrapper.find('.name').text()).toBe(item.name);
  });

  it(`should show allow me to connect if I'm not yet connected`, () => {
    const wrapper = shallow(TestItem, {
      propsData: { item },
      localVue,
      store,
      stubs: ['nuxt-link'],
    })
    expect(wrapper.find('.connect').text()).toBe('Connect');
  });
  ...

我试过了

我尝试创建一个 localVue 并按照建议对组件进行 stub in this github comment我也试过shallow/mount但这似乎也不起作用。

Answer 1

这就是我如何摆脱恼人的警告:

包含 RouterLinkStub，例如:

import { shallowMount, createLocalVue, RouterLinkStub } from '@vue/test-utils';

将 NuxtLink stub 映射到 RouterLinkStub

const wrapper = shallowMount(TestItem, {
  ...
  stubs: {
    NuxtLink: RouterLinkStub
  }
})

如果您正在检查 nuxt-link 文本或其他内容，请更改:

const link = wrapper.find('nuxt-link');

到

const link = wrapper.find(RouterLinkStub);

在 https://onigra.github.io/blog/2018/03/19/vue-test-utils-router-link-stub/ 上发现了这个黄金

幸好你不需要懂日语就可以阅读代码...