How to test Twitter Cards?

Question

I am setting up Twitter Cards using a player card. It works in the preview tool, but the docs say it needs to be tested "on twitter.com modern desktop browser? Native iOs & Android Twitter app? mobile.twitter.com iOS & Android default browsers?"

How can I test it on twitter.com and twitter mobile apps if it hasn't been approved it?

Answer 1

Twitter have added a Card Validator. Not sure if this will help you, but it might help others who land on this page from a Google search.

https://cards-dev.twitter.com/validator