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We love pull requests. Here's a quick guide:

  1. Fork the repo.

  2. Run the tests. We only take pull requests with passing tests, and it's great to know that you have a clean slate: bundle && bundle exec rake

  3. We are using Rubocop because we love static code analyzers.

Ways to run Rubocop:

  • bundle exec rubocop
  • bundle exec rake would run the test suite and after that it runs the Ruby static code analyzer.
  1. Please add a test for your change. Only refactoring and documentation changes require no new tests. If you are adding functionality or fixing a bug, we need a test! We use Minitest in this project.

  2. Make the test pass. Always use sample, shuffle, and rand from the Base class (just like the rest of the code) rather than Array#sample, Array#shuffle and Kernel#rand to preserve the deterministic feature.

  3. We care about code coverage and use SimpleCov to analyze the code and generate test coverage reports. It's possible to check the test coverage by running bundle exec rake coverage_report. Please make sure to not decrease our current % covered.

  4. When adding a new class, add a new yaml file to lib/locales/en rather than adding translations to lib/locales/en.yml. For example, if you add Faker::MyThing, put your translations in lib/locales/en/my_thing.yml. See the locale README for more info.

  5. Methods with optional arguments should use keyword rather than positional arguments. An exception to this could be a method that takes only one optional argument, and it's unlikely that that method would ever take more than one optional argument.

  6. Push to your fork and submit a pull request.

Github Flow for contributors and collaborators

For those of you with commit access, please check out Scott Chacon's blog post about github flow

  • Anything in the master branch is deployable
  • To work on something new, create a descriptively named branch off of master (ie: new-oauth2-scopes)
  • Commit to that branch locally and regularly push your work to the same named branch on the server
  • When you need feedback or help, or you think the branch is ready for merging, open a pull request
  • After someone else has reviewed and signed off on the feature, you can merge it into master

If you're reviewing a PR, you should ask youserlf:

  • Does it work as described? A PR should have a great description.
  • Is it understandable?
  • Is it well implemented?
  • Is it well tested?
  • Is it well documented?
  • Is it following the structure of the project?

Syntax/Good practices:

  • Two spaces, no tabs.
  • No trailing whitespace. Blank lines should not have any space.
  • Prefer &&, || over and, or.
  • MyClass.my_method(my_arg) not my_method( my_arg ) or my_method my_arg.
  • a = b and not a=b.
  • Follow the conventions you see used in the source already.


  • Use the rake console task to start a session with Faker loaded.