First, make sure you have the Polymer CLI installed. Then run polymer serve to serve your application locally.
$ polymer serve
$ polymer build
This will create a build/ folder with bundled/ and unbundled/ sub-folders
containing a bundled (Vulcanized) and unbundled builds, both run through HTML,
CSS, and JS optimizers.
You can serve the built versions by giving polymer serve a folder to serve
from:
$ polymer serve build/bundled
$ polymer test
Your application is already set up to be tested via web-component-tester. Run polymer test to run your application's test suite locally.
Install web-component-tester, istanbul and web-component-tester-istanbul global level
$ npm i -g web-component-tester@4.3.1 istanbul https://github.com/t2ym/web-component-tester-istanbul/tarball/0.10.1
Install coveralls in repository
$ npm install coveralls --save-dev