language: ruby

before_install:
  - for dir in $(echo $GEM_PATH | tr ':' ' '); do gem uninstall -i $dir bundler -a -x; done
  - gem install bundler -v $BUNDLER_TEST_VERSION
  - bundle --version

install:
  - bundle install --jobs=3 --retry=3 # do not use --deployment and freeze it

matrix:
  include:
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.7.15
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.8.9
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.9.10
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.10.5
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.11.2
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.12.5
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.13.6
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.14.6
    - rvm: 2.1.10
      env: BUNDLER_TEST_VERSION=1.14.6
    - rvm: 2.2.7
      env: BUNDLER_TEST_VERSION=1.14.6
    - rvm: 2.3.4
      env: BUNDLER_TEST_VERSION=1.15.0.pre.4