XUnit_framework_for_ruby is a project mainly written in Ruby, it's free.
This is based of xUnit Framework case study in Kent Beck TDD by Example book
This is a manual xUnit Framework for ruby based of xUnit Framework case study in Kent Beck's TDD by Exmaple book.
[in the run_tests.rb file you'll see 2 different sections first one is before birth of TestRunner class]
You can run this whole thing by this command ---> ruby run_tests.rb and then you should get a result like this: 8 run, 0 failed