DerailSpecs

DerailSpecs is a simple gem that makes it easy to write integration specs outside of the rails environment (derailed).

DerailsSpecs boots puma and provides a GET route (/reset-transaction) in which rollbacks your transaction and begins a new transaction for the next test. At the end of the test suite, it rollbacks the final transaction.

Add this line to your application's Gemfile:

gem 'derail_specs'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install derail_specs

To install the initializer, run:

$ rails g derail_specs:install

Then modify the configuration file located at config/initializers/derail_specs.rb to include your test command:

DerailSpecs.configure do |config|
  config.command = './tests.sh' # <-- your test command here, or blank for infinite mode
  config.host = '127.0.0.1'
  config.port = 3001
end

Alternatively, if you don't set a config.command, the server will boot in infinite mode and will not stop until receiving an INT signal (IE Ctrl+c). This is good for when your test command isn't available in a rails context, like when you are running rails in docker, but have a test application running on the host machine.

To run tests, run

$ rails derail_specs:run

Inside your preferred test suite, configure a before_each that runs a get request to HOST:PORT/reset-transaction.

This runs a rollback and begins a new transaction.

For instance, with curl and the default config, transactions can be reset with:

$ curl 127.0.0.1:3001/reset-transaction

Or if you're using detox:

beforeEach(async () => {
    await fetch('127.0.0.1:3001/reset-transaction');
  });

Post with a JSON array to /factory-bot/create with the following structure:

["test", { "name": "Test Name", "created_at": "2011-11-11 11:11:11" }]

which will run:

FactoryBot.create(:test, name: "Test Name", created_at: "2011-11-11 11:11:11")

Example curl:

curl -X POST \
      -d '["test", { "name": "Test Name from Curl", "created_at": "2011-11-11 11:11:11" }]' \
      -H 'Content-Type: application/json' \
      127.0.0.1:3001/factory-bot/create

By default, DerailSpecs doesn't run any fixtures. You can configure global fixture loading with initializer hooks in config/initializers/derail_specs.rb:

return unless Rails.env.test?

DerailSpecs.hooks.before_server_start do
  # Add our fixtures before the resettable transaction is started
  fixtures_dir = Rails.root.join("spec/fixtures")
  fixture_files = Dir.glob(fixtures_dir.join("**/*.yml")).map do |f|
    f[(fixtures_dir.to_s.size + 1)..-5]
  end

  @fixtures = ActiveRecord::FixtureSet.create_fixtures(
    fixtures_dir,
    fixture_files,
  )
end

DerailSpecs.hooks.before_server_stop do
  @fixtures.map(&:model_class).each(&:delete_all)
end

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the rspec tests and bin/test to run all tests, including sample rails app tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/roshreview/derail_specs. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

Big thanks to testdouble/cypress-rails to the puma server + transactions work they did for the cypress environment.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the DerailSpecs project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.