Best Unit Test Framework for Test Automation Framework

Ruby
1

Hi,

As we have plan to build a new Test Auotamtion framework for our application, parallely we plan to build a Unit test framework for that. I have few question can anyone pls guide on this,

  1. Test::Unit vs rspec vs minutest - which is suitable( Note: we are not building this on rails)
  2. Which of these comes with ruby standard library