This is a stupid simple example of how easy it is to make a minitest plugin that does something useful. In this case it wraps assert so that failed assertions will drop into the ruby debugger.
Add this to the top of your test file or helper:
require 'minitest/debugger' if ENV['DEBUG']
Then run your tests as normal but define DEBUG=1:
% DEBUG=1 rake test Debug.rb Emacs support available. Run options: --seed 27343 # Running tests: .Assertion Failed. Dropping into debugger now: ./lib/minitest/debugger.rb:40: (rdb:1) up 2 #3 example.rb:18:in `test_assert_failure' (rdb:1) l [13, 22] in example.rb 13 def wrong 14 24 15 end 16 17 def test_assert_failure => 18 assert_equal 42, wrong 19 end 20 21 def bad 22 raise "no"
gem install minitest-debuggerIf you want to hack on minitest-debugger, clone it from GitHub:
git clone git://github.com/seattlerb/minitest-debugger