CircleCI, Rails 5, Minitest, and avoiding the OptionParser::InvalidOption exception

After updating a project to rails 5 I was no longer able to use the minitest-ci gem without making a few changes. My project was failing with the following exception:

/home/ubuntu/ebth-com/vendor/bundle/ruby/2.2.0/gems/railties-5.0.1/lib/rails/test_unit/minitest_plugin.rb:57:in `plugin_rails_options': invalid option: --ci-dir=/tmp/circle-junit.pSCJhIM/minitest (OptionParser::InvalidOption)

To fix I basically had to override the test command so –ci-dir wouldn’t be specified. Here is the process as if you hadn’t even set up minitest-ci before:

1. Add minitest-ci to your Gemfile.
2. Run bundle
3. Add the following to your test_helper.rb:

require 'minitest'
require 'minitest/autorun'
require 'minitest/ci'

if ENV['CIRCLE_TEST_REPORTS']
  Minitest::Ci.report_dir = "#{ENV['CIRCLE_TEST_REPORTS']}/reports"
end

4. Edit your circle.yml and set up this test override:

  override:
    - bundle exec rails test:
        parallel: true
        files:
          - test/**/*_test.rb

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