well, mocha-webpack runs

.gitignore

@@ -22,6 +22,7 @@ app/assets/javascripts/webpacked
 # Ignore all logfiles and tempfiles.
 log/*.log
 tmp
+.tmp
 
 coverage
 

package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "build": "webpack",
     "build:watch": "webpack --watch",
-    "test": "mocha --compilers js:babel-core/register frontend/test",
+    "test": "mocha-webpack --webpack-config webpack.test.config.js frontend/test",
     "eslint": "eslint frontend",
     "eslint:fix": "eslint --fix frontend"
   },

webpack.config.js

@@ -5,8 +5,12 @@ const NODE_ENV = process.env.NODE_ENV || 'development'
 const plugins = [
   new webpack.DefinePlugin({
     "process.env.NODE_ENV": `"${NODE_ENV}"`
-  })
+  }),
+  new webpack.IgnorePlugin(/^mock-firmata$/), // work around bindings.js error
+  new webpack.ContextReplacementPlugin(/bindings$/, /^$/) // work around bindings.js error
 ]
+const externals = ["bindings"] // work around bindings.js error
+
 if (NODE_ENV === 'production') {
   plugins.push(new webpack.optimize.DedupePlugin())
   plugins.push(new webpack.optimize.UglifyJsPlugin({
@@ -26,6 +30,7 @@ const devtool = NODE_ENV === 'production' ? undefined : 'cheap-module-eval-sourc
 module.exports = {
   context: __dirname,
   plugins,
+  externals,
   devtool,
   module: {
     preLoaders: [

webpack.test.config.js

@@ -0,0 +1,5 @@
+const config = require('./webpack.config')
+
+config.target = 'node'
+
+module.exports = config