Gem's Rake tasks to use current location

In a gem I use Appraisal to test against different gem dependencies.

The problem I face is that Appraisal try to run the command :

BUNDLE_GEMFILE=gemfiles/3.0.gemfile bundle exec /Users/seb/.rvm/gems/ruby-1.8.7-p334/bin/rake spec cucumber

This cause an issue with the cucumber test as aruba's file are located in a subdirectory tmp/aruba

A solution would be to get Appraisal to use absolute path to locate the gemfiles and therefore run something like follow instead:

BUNDLE_GEMFILE=/Users/seb/Wor开发者_运维百科k/GitHub/rspec-subject-extensions/gemfiles/3.0.gemfile bundle exec /Users/seb/.rvm/gems/ruby-1.8.7-p334/bin/rake spec cucumber

Question is, how to get Appraisal rake tasks to know the current location ?

Dir.pwd seems to do just that. Thanks to croaky for the tip.