How do I test my site before go-live?

How do I test my site and section.io configuration before it goes live?

There is an article for local testing of a site before going live on the section.io platform which you can see here:
https://support.section.io/hc/en-us/articles/213590983-Testing-your-site-on-section-io-before-go-live

You can also use third party testing tools like www.webpagetest.org
See https://www.section.io/docs/testing/ for more details.

Testing before go live should be focused on functional testing, making sure features on the site work like Checkout, Login, Add to cart etc. The performance benefits of caching will be clearer after go-live when the cache can be populated. Testing before go live when there is no traffic going through the platform, means the cache would be unpopulated. Testing against a cold cache will yield slower page load times as many requests will be cache misses. After go-live the cache will become populated leading to cache higher hit rates, and give even better performance.