修改

src/App.vue

 <template>
   <div id="app">
-    <img src="./assets/logo.png">
     <router-view/>
   </div>
 </template>

src/components/HelloWorld.vue

 <template>
-  <div class="hello">
-    <h1>{{ msg }}</h1>
-    <h2>Essential Links</h2>
-    <ul>
-      <li>
-        <a
-          href="https://vuejs.org"
-          target="_blank"
-        >
-          Core Docs
-        </a>
-      </li>
-      <li>
-        <a
-          href="https://forum.vuejs.org"
-          target="_blank"
-        >
-          Forum
-        </a>
-      </li>
-      <li>
-        <a
-          href="https://chat.vuejs.org"
-          target="_blank"
-        >
-          Community Chat
-        </a>
-      </li>
-      <li>
-        <a
-          href="https://twitter.com/vuejs"
-          target="_blank"
-        >
-          Twitter
-        </a>
-      </li>
-      <br>
-      <li>
-        <a
-          href="http://vuejs-templates.github.io/webpack/"
-          target="_blank"
-        >
-          Docs for This Template
-        </a>
-      </li>
-    </ul>
-    <h2>Ecosystem</h2>
-    <ul>
-      <li>
-        <a
-          href="http://router.vuejs.org/"
-          target="_blank"
-        >
-          vue-router
-        </a>
-      </li>
-      <li>
-        <a
-          href="http://vuex.vuejs.org/"
-          target="_blank"
-        >
-          vuex
-        </a>
-      </li>
-      <li>
-        <a
-          href="http://vue-loader.vuejs.org/"
-          target="_blank"
-        >
-          vue-loader
-        </a>
-      </li>
-      <li>
-        <a
-          href="https://github.com/vuejs/awesome-vue"
-          target="_blank"
-        >
-          awesome-vue
-        </a>
-      </li>
-    </ul>
-  </div>
+    <div>
+        
+    </div>
 </template>
 
 <script>
 export default {
-  name: 'HelloWorld',
+  name: 'Login',
   data () {
     return {
-      msg: 'Welcome to Your Vue.js App'
+      msg: ''
     }
   }
 }
 </script>
 
-<!-- Add "scoped" attribute to limit CSS to this component only -->
-<style scoped>
-h1, h2 {
-  font-weight: normal;
-}
-ul {
-  list-style-type: none;
-  padding: 0;
-}
-li {
-  display: inline-block;
-  margin: 0 10px;
-}
-a {
-  color: #42b983;
-}
+<style>
+
 </style>

test/e2e/custom-assertions/elementCount.js

-// A custom Nightwatch assertion.
-// The assertion name is the filename.
-// Example usage:
-//
-//   browser.assert.elementCount(selector, count)
-//
-// For more information on custom assertions see:
-// http://nightwatchjs.org/guide#writing-custom-assertions
-
-exports.assertion = function (selector, count) {
-  this.message = 'Testing if element <' + selector + '> has count: ' + count
-  this.expected = count
-  this.pass = function (val) {
-    return val === this.expected
-  }
-  this.value = function (res) {
-    return res.value
-  }
-  this.command = function (cb) {
-    var self = this
-    return this.api.execute(function (selector) {
-      return document.querySelectorAll(selector).length
-    }, [selector], function (res) {
-      cb.call(self, res)
-    })
-  }
-}

test/e2e/nightwatch.conf.js

-require('babel-register')
-var config = require('../../config')
-
-// http://nightwatchjs.org/gettingstarted#settings-file
-module.exports = {
-  src_folders: ['test/e2e/specs'],
-  output_folder: 'test/e2e/reports',
-  custom_assertions_path: ['test/e2e/custom-assertions'],
-
-  selenium: {
-    start_process: true,
-    server_path: require('selenium-server').path,
-    host: '127.0.0.1',
-    port: 4444,
-    cli_args: {
-      'webdriver.chrome.driver': require('chromedriver').path
-    }
-  },
-
-  test_settings: {
-    default: {
-      selenium_port: 4444,
-      selenium_host: 'localhost',
-      silent: true,
-      globals: {
-        devServerURL: 'http://localhost:' + (process.env.PORT || config.dev.port)
-      }
-    },
-
-    chrome: {
-      desiredCapabilities: {
-        browserName: 'chrome',
-        javascriptEnabled: true,
-        acceptSslCerts: true
-      }
-    },
-
-    firefox: {
-      desiredCapabilities: {
-        browserName: 'firefox',
-        javascriptEnabled: true,
-        acceptSslCerts: true
-      }
-    }
-  }
-}

test/e2e/runner.js

-// 1. start the dev server using production config
-process.env.NODE_ENV = 'testing'
-
-const webpack = require('webpack')
-const DevServer = require('webpack-dev-server')
-
-const webpackConfig = require('../../build/webpack.prod.conf')
-const devConfigPromise = require('../../build/webpack.dev.conf')
-
-let server
-
-devConfigPromise.then(devConfig => {
-  const devServerOptions = devConfig.devServer
-  const compiler = webpack(webpackConfig)
-  server = new DevServer(compiler, devServerOptions)
-  const port = devServerOptions.port
-  const host = devServerOptions.host
-  return server.listen(port, host)
-})
-.then(() => {
-  // 2. run the nightwatch test suite against it
-  // to run in additional browsers:
-  //    1. add an entry in test/e2e/nightwatch.conf.js under "test_settings"
-  //    2. add it to the --env flag below
-  // or override the environment flag, for example: `npm run e2e -- --env chrome,firefox`
-  // For more information on Nightwatch's config file, see
-  // http://nightwatchjs.org/guide#settings-file
-  let opts = process.argv.slice(2)
-  if (opts.indexOf('--config') === -1) {
-    opts = opts.concat(['--config', 'test/e2e/nightwatch.conf.js'])
-  }
-  if (opts.indexOf('--env') === -1) {
-    opts = opts.concat(['--env', 'chrome'])
-  }
-
-  const spawn = require('cross-spawn')
-  const runner = spawn('./node_modules/.bin/nightwatch', opts, { stdio: 'inherit' })
-
-  runner.on('exit', function (code) {
-    server.close()
-    process.exit(code)
-  })
-
-  runner.on('error', function (err) {
-    server.close()
-    throw err
-  })
-})

test/e2e/specs/test.js

-// For authoring Nightwatch tests, see
-// http://nightwatchjs.org/guide#usage
-
-module.exports = {
-  'default e2e tests': function (browser) {
-    // automatically uses dev Server port from /config.index.js
-    // default: http://localhost:8080
-    // see nightwatch.conf.js
-    const devServer = browser.globals.devServerURL
-
-    browser
-      .url(devServer)
-      .waitForElementVisible('#app', 5000)
-      .assert.elementPresent('.hello')
-      .assert.containsText('h1', 'Welcome to Your Vue.js App')
-      .assert.elementCount('img', 1)
-      .end()
-  }
-}

test/unit/.eslintrc

-{
-  "env": { 
-    "jest": true
-  },
-  "globals": { 
-  }
-}

test/unit/jest.conf.js

-const path = require('path')
-
-module.exports = {
-  rootDir: path.resolve(__dirname, '../../'),
-  moduleFileExtensions: [
-    'js',
-    'json',
-    'vue'
-  ],
-  moduleNameMapper: {
-    '^@/(.*)$': '<rootDir>/src/$1'
-  },
-  transform: {
-    '^.+\\.js$': '<rootDir>/node_modules/babel-jest',
-    '.*\\.(vue)$': '<rootDir>/node_modules/vue-jest'
-  },
-  testPathIgnorePatterns: [
-    '<rootDir>/test/e2e'
-  ],
-  snapshotSerializers: ['<rootDir>/node_modules/jest-serializer-vue'],
-  setupFiles: ['<rootDir>/test/unit/setup'],
-  mapCoverage: true,
-  coverageDirectory: '<rootDir>/test/unit/coverage',
-  collectCoverageFrom: [
-    'src/**/*.{js,vue}',
-    '!src/main.js',
-    '!src/router/index.js',
-    '!**/node_modules/**'
-  ]
-}

test/unit/setup.js

-import Vue from 'vue'
-
-Vue.config.productionTip = false

test/unit/specs/HelloWorld.spec.js

-import Vue from 'vue'
-import HelloWorld from '@/components/HelloWorld'
-
-describe('HelloWorld.vue', () => {
-  it('should render correct contents', () => {
-    const Constructor = Vue.extend(HelloWorld)
-    const vm = new Constructor().$mount()
-    expect(vm.$el.querySelector('.hello h1').textContent)
-      .toEqual('Welcome to Your Vue.js App')
-  })
-})