Cucumber-Rails

Cucumber-Rails brings Cucumber to Rails 5.2, 6.x, 7.x, and 8.x.

Installation

Before you can use the generator, add the gem to your project's Gemfile as follows:

group :test do
  gem 'cucumber-rails', require: false
  # database_cleaner is not required, but highly recommended
  gem 'database_cleaner'
end

Then install it by running:

bundle install

Learn about the various options:

rails generate cucumber:install --help

Finally, bootstrap your Rails app, for example:

rails generate cucumber:install

Running Cucumber

[bundle exec] cucumber

Configuration options

By default, cucumber-rails runs DatabaseCleaner.start and DatabaseCleaner.clean before and after your scenarios. You can disable this behaviour like so:

# features/support/env.rb
# ...
Cucumber::Rails::Database.autorun_database_cleaner = false

By default, cucumber-rails will auto mix-in the helpers from Rack::Test into your default Cucumber World instance. You can prevent this behaviour like so:

# features/support/env.rb
ENV['CR_REMOVE_RACK_TEST_HELPERS'] = 'true'

Upgrading from a previous version

When upgrading from a previous version it is recommended that you rerun:

rails generate cucumber:install

Bugs and feature requests

The only way to have a bug fixed or a new feature accepted is to describe it with a Cucumber feature. Let's say you think you have found a bug in the cucumber:install generator. Fork this project, clone it to your workstation and check out a branch with a descriptive name:

git clone git@github.com:you/cucumber-rails.git
git checkout -b bugfix/generator-fails-on-bundle-exec

Start by making sure you can run the existing features. Now, create a feature that demonstrates what's wrong. See the existing features for examples. When you have a failing feature that reproduces the bug, commit, push and send a pull request. Someone from the Cucumber-Rails team will review it and hopefully create a fix.

If you know how to fix the bug yourself, make a second commit (after committing the failing feature) before you send the pull request.

Setting up your environment

Make sure you have a supported ruby installed, cd into your cucumber-rails repository and run

gem install bundler
bundle install
bin/install_geckodriver.sh
bin/install_webpacker.sh

Running all tests

With all dependencies installed, all specs and features should pass:

[bundle exec] rake

Running Appraisal suite

In order to test against multiple versions of key dependencies, the Appraisal gem is used to generate multiple gemfiles, stored in the gemfiles/ directory. Normally these will only run on GitHub via GitHub Actions; however if you want to run the full test suite against all gemfiles, run the following commands:

[bundle exec] appraisal install
[bundle exec] appraisal rake test

To run the suite against a named gemfile, use the following:

[bundle exec] appraisal rails_6_0 rake test

Adding dependencies

To support the multiple-gemfile testing, when adding a new dependency the following rules apply:

1. If it's a runtime dependency of the gem, add it to the gemspec
2. If it's a primary development dependency, add it to the gemspec
3. If it's a dependency of a generated rails app in a test, add it to the helper method that modifies the Gemfile

For example, rspec is a primary development dependency, so it lives in the gemspec.