sudo: false
language: ruby
before_script:
  # https://github.com/travis-ci/travis-ci/issues/8408
  - unset _JAVA_OPTIONS
script:
  - bundle exec rspec
matrix:
  include:
  - rvm: 2.3.7
  - rvm: 2.4.4
    before_install:
      # https://github.com/travis-ci/travis-ci/issues/8978
      - gem update --system
      - gem install bundler
  - rvm: 2.5.1
    before_install:
      # https://github.com/travis-ci/travis-ci/issues/8978
      - gem update --system
      - gem install bundler
  - rvm: ruby-head
    before_install:
      # https://github.com/travis-ci/travis-ci/issues/8978
      - gem update --system
      - gem install bundler
  - jdk: oraclejdk8
    install:
      - curl -L https://github.com/oracle/truffleruby/releases/download/vm-enterprise-0.28/truffleruby-testing-0.28.tar.gz | tar xz
      - source truffleruby/setup_env
      - bundle install