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: 2.2.7
  - rvm: 2.3.4
  - rvm: 2.4.1
  - rvm: ruby-head
  - jdk: oraclejdk8
    install:
      - curl -L https://github.com/graalvm/truffleruby/releases/download/vm-enterprise-0.27/truffleruby-testing-0.27.tar.gz | tar xz
      - source truffleruby/setup_env
      - bundle install

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: 2.2.7
  - rvm: 2.3.4
  - rvm: 2.4.1
  - rvm: ruby-head
  - jdk: oraclejdk8
    install:
      - curl -L https://github.com/graalvm/truffleruby/releases/download/vm-enterprise-0.28/truffleruby-testing-0.28.tar.gz | tar xz
      - source truffleruby/setup_env
      - bundle install

Update to TruffleRuby 0.28 in Travis
Update to TruffleRuby 0.28 in Travis
