每隔一段时间，我就会在我的开源项目的 travis 中得到这个（如果你愿意，可以随意贡献：D）：
$ gem install bundler
Fetching: bundler-1.3.5.gem (100%)
Successfully installed bundler-1.3.5
1 gem installed
install
$ bundle install --deployment
Fetching gem metadata from https://rubygems.org/.......
Fetching gem metadata from https://rubygems.org/..
Installing rake (10.0.3)
Installing backports (2.8.2)
Installing builder (3.1.4)
Installing mime-types (1.20.1)
Installing nokogiri (1.5.6)
Installing rack (1.5.1)
Installing rack-test (0.6.2)
Installing ffi (1.3.1)
Installing childprocess (0.3.7)
Installing multi_json (1.5.0)
Installing rubyzip (0.9.9)
Installing websocket (1.0.7)
Installing selenium-webdriver (2.29.0)
Installing xpath (1.0.0)
Installing capybara (2.0.2)
Installing coderay (1.0.8)
Installing diff-lcs (1.2.0)
Installing json (1.7.6)
Installing gherkin (2.11.6)
Installing cucumber (1.2.1)
Installing dalli (2.2.1)
Installing eventmachine (1.0.0)
Installing multipart-post (1.1.5)
Installing faraday (0.8.4)
Installing faye-websocket (0.4.7)
Installing git (1.2.5)
Installing http_parser.rb (0.5.3)
Using bundler (1.3.5)
Installing rdoc (3.12)
Installing jeweler (1.8.4)
Installing metaclass (0.0.1)
Installing method_source (0.8.1)
Installing mocha (0.13.2)
Installing poltergeist (1.1.2)
Installing slop (3.3.3)
Installing pry (0.9.10)
Installing rack-protection (1.3.2)
Installing rspec-core (2.13.1)
Installing rspec-expectations (2.13.0)
Installing rspec-mocks (2.13.0)
Installing rspec (2.13.0)
Installing tilt (1.3.3)
Installing sinatra (1.3.4)
Installing sinatra-contrib (1.3.2)
Your bundle is complete!
It was installed into ./vendor/bundle
Post-install message from rdoc:
Depending on your version of ruby, you may need to install ruby rdoc/ri data:
<= 1.8.6 : unsupported
= 1.8.7 : gem install rdoc-data; rdoc-data --install
= 1.9.1 : gem install rdoc-data; rdoc-data --install
>= 1.9.2 : nothing to do! Yay!
before_script.1
$ export DISPLAY=:99.0
before_script.2
$ sh -e /etc/init.d/xvfb start
Starting virtual X frame buffer: Xvfb.
$ bundle exec rake
/home/travis/.rvm/rubies/ruby-2.0.0-p247/bin/ruby -S bundle exec cucumber features --format pretty
undefined method `helpers' for Sinatra:Module (NoMethodError)
有问题的构建也可以在这里看到： https ://travis-ci.org/thiagofm/memcached-manager/jobs/10071127
项目代码在github上： https ://github.com/thiagofm/memcached-manager