Rails Generators for Cucumber with special support for Capybara and DatabaseCleaner
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Latest commit 4e072c3 May 17, 2018



Gem Version Build Status Code Climate Dependency Status Open Source Helpers

Cucumber-Rails brings Cucumber to Rails 4.x and 5.x. For Rails 3.x support, use version 1.4.5. For Rails 2.3.x support, see the rails-2.3.x branch.


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'

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

With Rake:

rake cucumber

Without Rake:

[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

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 bug-install-generator

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

We strongly recommend that you use rvm or rbenv and ruby 2.2.0. When you have that, cd into your cucumber-rails repository and:

gem install bundler
bundle install

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 is used to generate multiple gemfiles, stored in the gemfiles/ directory. Normally these will only run on Travis; 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_4_1 rake test

To remove and rebuild the different gemfiles (for example, to update a rails version or its dependencies), use the following:

[bundle exec] appraisal install

If you've changed versions of the dependencies, you may find it helpful to forcefully clean each appraisal's gem lock file in gemfiles/. You can do this using:

[bundle exec] rake clean

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 Gemfile (for local test runs) and each appraisal section (if necessary).

For example, rspec is a primary development dependency, so it lives in the gemspec. By contrast, coffee-rails is a dependency of apps generated with rails 3.1 and 3.2, so lives in the main Gemfile and the rails 3.1 and 3.2 appraisal sections.


If you get an error while trying to run the tests locally, similar to the one below:

Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)

you would need to install a javascript runtime.

You can do that in ubuntu by using:

sudo apt-get install nodejs