This is our current Travis configuration for our standard Rails 4 + Ruby 2 projects that have Capybara Webkit test suites and Postgres databases. It relies on the bundle_cache.rb and bundle_install.sh files from http://randomerrata.com/post/45827813818/travis-s3 to cache gem bundles for much faster test suite setup time.

.travis.yml

---
rvm:
  - 2.0.0

before_install:
  - "echo 'gem: --no-document' > ~/.gemrc"
  - "echo '--colour' > ~/.rspec"
  - gem install fog
  - "./script/travis/bundle_install.sh"
  - export DISPLAY=:99.0
  - sh -e /etc/init.d/xvfb start

before_script:
  - cp .sample.env .env
  - psql -c 'create database "project-name_test";' -U postgres
  - bundle exec rake db:migrate db:test:prepare

after_script:
  - "ruby script/travis/bundle_cache.rb"

bundler_args:
  --without development staging production --path=~/.bundle

script:
  - bundle exec rake spec

notifications:
  campfire:
    rooms:
      thoughtbot:
        - 123abc@123abc
    on_success:
      - always
    on_failure:
      - always
    template:
      - '(%{branch} - %{author}): %{message} - %{build_url}'

env:
  global:
    - BUNDLE_ARCHIVE="project-name"
    - AWS_S3_BUCKET="company-name-travis-bundles"
    - RAILS_ENV=test
    - secure: 123abc+123abc+123abc/0=