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After you create the classic 2013 web application and mount some classic authentication mode databases to it from a 2010 server, you’ should convert the web application to use claims based authentication:
Convert-SPWebApplication -Identity <URLofWebApp:Port> -RetainPermissions -To Claims -From <Choices are in the comments below>
After the job completes, you can close your powershell and open a new shell, run test-SpContentDataBase against the one of the databases you had mounted to the web app and verify that no claims to classic error messages exist.
Note: In some cases it can take up to 24 hours before the message ceases to exist.
What if you just mounted the database straight to a claims based web app??
In certain instances, you may need to run this powershell command to get users to migrate over from classic to claims. For example, if you mounted the database straight to a claims based web application, versus the approach given above.