Have Travis CI Install Drupal. Source http://dropbucket.org/node/1761 #CI

travis.yml

language: php

php:
  - 5.3
  - 5.4
  - 5.5
  - hhvm

matrix:
  allow-failures:
    - php: hhvm

  env:
    global:
      - ES_VER=1.0.1
      - ES_MAPPER_ATTACHMENTS_VER=2.0.0.RC1
      - ES_TRANSPORT_THRIFT_VER=2.0.0.RC1
      - ES_GEOCLUSTER_FACET_VER=0.0.10
      - ES_WAIT_ON_MAPPING_CHANGE=true
      - DATABASE='drupal'
      - DB_USERNAME='root'
      - DB_ENCODE='utf8'
    matrix:
      - DRUPAL_3RD_PARTY='composer_manager'
      - DRUPAL_3RD_PARTY='libraries'

mysql:
  database: $DATABASE
  username: $DB_USERNAME
  encoding: $DB_ENCODE

before_install:
  - export UPDATE TRAVIS_BUILD_DIR
  - BUILD_TOP=`dirname $TRAVIS_BUILD_DIR`
  - EXIT_VALUE=0

  - sudo apt-get update > /dev/null

  - composer self-update
install:
    # install php packages required for running a web server from drush on php 5.3
  - sudo apt-get install -y --force-yes php5-cgi php5-mysql

  # install drush globally
  - composer global require drush/drush:6.*

  # add composer's global bin directory to the path
  # see: https://github.com/drush-ops/drush#install---composer
  - export PATH="$HOME/.composer/vendor/bin:$PATH"
before_script:
  #- echo 'sendmail_path = /bin/true' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
  # establish drupal package put in place the right way
  - sudo mkdir -p /var/www
  - sudo chown travis:travis /var/www
  - drush dl drupal --destination=/var/www --default-major=7 --drupal-project-rename=drupal --y
  # setup some drush stuff
  - sudo chown -R travis:travis ~/.drush
  - cd ~/.drush/
  # get some plugins good for testing and building systems rapidly
  - drush dl drush_recipes, registry_rebuild, drush_ecl --y
  - drush cc drush

script:
  # stand up drupal
  - cd /var/www/drupal
  - drush site-install -y --db-url=mysql://root@localhost/travisdb --db-su='root' --db-su-pw=''
  # @todo put the other stuff here to build but this should give us a site
  - cd /var/www/drupal/sites/all/modules
after_script:
  - drush status

notifications:
# add your IRC here
#  irc: irc.freenode.org#{CHANNEL}

#  email: false
#  slack:
#    rooms:
# add your slack rooms here

Also related: https://github.com/LionsAd/drupal_ti