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Git
travis-ci/travis-tests:.travis.yml@3472342
os: linux
dist: bionic

install: skip

jobs:
  include:
    - name: "start with ruby 2.6.x and shift to 2.4.8"
      arch: amd64
      language: ruby
      ruby: 2.6.9
      before_install:
        - rvm install 2.4.8
        - rvm use 2.4.8
        - gem install bundler -v '<2'
      script:
        - ruby -v
        - bundler -v
Build Config
{
  "language": "ruby",
  "os": [
    "linux"
  ],
  "dist": "bionic",
  "install": [
    "skip"
  ],
  "jobs": {
    "include": [
      {
        "name": "start with ruby 2.6.x and shift to 2.4.8",
        "arch": "amd64",
        "language": "ruby",
        "before_install": [
          "rvm install 2.4.8",
          "rvm use 2.4.8",
          "gem install bundler -v '<2'"
        ],
        "script": [
          "ruby -v",
          "bundler -v"
        ],
        "rvm": "2.6.9"
      }
    ]
  }
}