test_all_ruby_versions

#!/usr/bin/env bash
# Run tests in all supported Ruby versions
set -e

versions=("ruby-2.4.2" "ruby-2.3.5" "ruby-2.3.0")
installed_version="$(rvm list strings)"
for version in "${versions[@]}"; do
  echo "Testing $version"
  # Install this ruby version if not yet installed
  if [[ "$installed_version" != *"$version"* ]]; then
    echo "$version not found, installing it"
    rvm install "$version"
  fi

  echo "Updating dependencies"
  rvm "$version" 'do' gem install bundler
  rvm "$version" 'do' bundle install --quiet
  echo "✔ Dependencies updated"

  echo "Running tests"
  rvm "$version" 'do' bundle exec rake test
done