cucumber/cucumber — pull request #335 by undees (2012-10-31 05:37:15+00:00)
Title: Fall back on Test::Unit::Assertions if rspec-expectations is missing

Currently, users who don't want to use rspec-expectations have to do a little extra setup in their env.rb to use Test::Unit. Since Test::Unit ships with Ruby (albeit as a wrapper in 1.9), it makes sense to look
for this library as a fallback. This lowers the barrier even further for users who want to jump straight into Cucumber with minimal dependencies.