Webpack Breaks Mocha in Node.js App

Question

I have a node.js app that uses Mocha and Expect for testing. All the tests work great, until I installed webpack for react. Now when I run "npm test" I get the following error:

Error: Cannot find module 'should'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (C:\Users\Brian\version-control\tysons-tech-map-redone\node_modules\watchpack\test\DirectoryWatcher.test.js:2:1)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at C:\Users\Brian\version-control\tysons-tech-map-redone\node_modules\mocha\lib\mocha.js:230:27
    at Array.forEach (native)
    at Mocha.loadFiles (C:\Users\Brian\version-control\tysons-tech-map-redone\node_modules\mocha\lib\mocha.js:227:14)
    at Mocha.run (C:\Users\Brian\version-control\tysons-tech-map-redone\node_modules\mocha\lib\mocha.js:495:10)
    at Object.<anonymous> (C:\Users\Brian\version-control\tysons-tech-map-redone\node_modules\mocha\bin\_mocha:469:18)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:393:7)
    at startup (bootstrap_node.js:150:9)
    at bootstrap_node.js:508:3
npm ERR! Test failed.  See above for more details.

Below is my package.json:

{
  "name": "cool-map",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node server.js",
    "test": "export NODE_ENV=test || SET \"NODE_ENV=test\" && mocha **/*.test.js",
    "test-watch": "nodemon --exec \"npm test\""
  },
  "engines": {
    "node": "6.2.2"
  },
  "license": "ISC",
  "dependencies": {
    "bcryptjs": "^2.3.0",
    "body-parser": "^1.15.2",
    "express": "^4.14.0",
    "jsonwebtoken": "^7.1.9",
    "lodash": "^4.15.0",
    "mongodb": "^2.2.5",
    "mongoose": "^4.5.9",
    "validator": "^5.6.0",
    "hbs": "^4.0.0",
    "babel-preset-stage-0": "^6.24.1",
    "express": "^4.15.2",
    "react": "^0.14.7",
    "react-dom": "^0.14.7"
  },
  "devDependencies": {
    "expect": "^1.20.2",
    "mocha": "^3.0.2",
    "nodemon": "^1.10.2",
    "supertest": "^2.0.0",
    "babel-core": "^6.5.1",
    "babel-loader": "^6.2.2",
    "babel-preset-es2015": "^6.5.0",
    "babel-preset-react": "^6.5.0",
    "webpack": "^1.12.13"
  }
}

I'm not sure if webpack.config is necessary to post, but just in case:

module.exports = {
    entry: './app/app.jsx',
    output: {
        path: __dirname,
        filename: './public/bundle.js'
    },
    resolve: {
        root: __dirname,
        alias: {
            AdminUserTable: 'app/components/AdminUserTable.jsx'
        },
        extensions: ['', '.js', '.jsx']
    },
    module: {
        loaders: [
            {
                    loader: 'babel-loader',
                query: {
                    presets: ['react', 'es2015']
                },
                test: /\.jsx?$/,
                exclude: /(node_modules|bower_components)/
            }
        ]
    }
};

Running the command npm test works great when I uninstall webpack, I'm not sure why It's breaking mocha.

Answer 1

Your package.json is missing should as a dependency.

Install it via;

npm install --save-dev should

Also I would recommend you look into chai which in my opinion provides a slightly different API.

Answer 2

should is an expressive, readable, framework-agnostic assertion library. The main goals of this library are to be expressive and to be helpful. It keeps your test code clean, and your error messages helpful. By default (when you require('should')) should extends the Object.prototype with a single non-enumerable getter that allows you to express how that object should behave. It also returns itself when required with require. It is also possible to use should.js without getter (it will not even try to extend Object.prototype), just require('should/as-function'). Or if you already use version that auto add getter, you can call .noConflict function. Results of (something).should getter and should(something) in most situations are the same

Better u install node dependency should with npm as below

npm install --save should

should-reference