Add(chore): Precomit testrun

Author: Daniel Weber

Diff for: package.json

@@ -5,6 +5,7 @@
   "author": "Daniel Weber <[email protected]>",
   "private": true,
   "scripts": {
+    "precommit": "npm run test",
     "dev": "webpack-dev-server --inline --progress --config build/webpack.dev.conf.js",
     "start": "npm run dev",
     "unit": "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run",