webpack karma启动时提示 Can not load "webpack", it is not registered

Question

最近在学习自动化测试，与vue整合的时候，karma start出现一个问题Can not load "webpack", it is not registered
项目地址：https://github.com/shunzizhan...

package.json

    "karma": "^1.4.1",
    "karma-coverage": "^1.1.1",
    "karma-mocha": "^1.3.0",
    "karma-phantomjs-launcher": "^1.0.2",
    "karma-phantomjs-shim": "^1.4.0",
    "karma-sinon-chai": "^1.3.1",
    "karma-sourcemap-loader": "^0.3.7",
    "karma-spec-reporter": "0.0.31",
    "karma-webpack": "^2.0.2",
    ……
    "webpack": "^3.6.0",
    "webpack-dev-middleware": "^1.12.0",
    "webpack-hot-middleware": "^2.18.2",
    "webpack-merge": "^4.1.0"

karma.conf.js

var webpack = require('webpack');
module.exports = function(config) {
  config.set({
    ……
    preprocessors: {
        'test/unit/**/*.spec.js':['webpack']
    },
    ……
    // webpack配置
    webpack:{
        module:{
            loaders:[
            {
                test:/\.js$/,
                exclude:/(node_modules|bower_components)/,
                loader:'babel-loader'
            },{
                test:/\.vue$/,
                loader:'vue-loader'
            }]
        },
        vue:{
            loaders:{
                js:'babel-loader'
            }
        },
        babel:{
            presets:['es2015']
        }
    }
  })
}

Answer 1

安装 karma-webpack

Answer 2

运行karma start 当前目录必须有test目录

Answer 3

我也遇到了！没解决，