fix npm test script

package.json

@@ -4,7 +4,7 @@
   "description": "A webpack plugin for the Monaco Editor",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "./node_modules/.bin/webpack --config test/webpack.config.js"
   },
   "repository": {
     "type": "git",

test/webpack.config.js

@@ -4,6 +4,7 @@ const path = require('path');
 module.exports = {
     mode: 'development',
     entry: './index.js',
+    context: __dirname,
     output: {
         path: path.resolve(__dirname, 'dist'),
         filename: 'app.js'
@@ -17,4 +18,4 @@ module.exports = {
     plugins: [
         new MonacoWebpackPlugin()
     ]
-};
+};