Fuubar is an instafailing RSpec formatter that uses a progress bar instead of a string of letters and dots as feedback.

Code Quality Rank: L5
Monthly Downloads: 777,477
Programming language: Ruby
License: MIT License
Latest version: v2.5.0

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fuubar is an instafailing RSpec formatter that uses a progress bar instead of a string of letters and dots as feedback.



gem install fuubar

# or in your Gemfile

gem 'fuubar'


In order to use fuubar, you have three options.

Option 1: Invoke It Manually Via The Command Line

rspec --format Fuubar --color

Option 2: Add It To Your Local .rspec File

# .rspec

--format Fuubar

Option 3: Add It To Your spec_helper.rb

# spec/spec_helper.rb

RSpec.configure do |config|
  config.add_formatter 'Fuubar'

Advanced Usage

Customizing The Bar

fuubar exposes an RSpec configuration variable called fuubar_progress_bar_options which, when set will be passed directly to ruby-progressbar which does all the heavy lifting. Take a look at the ruby-progressbar documentation for details on all of the options you can pass in.


Let's say for example that you would like to change the format of the bar. You would do that like so:

# spec/spec_helper.rb

RSpec.configure do |config|
  config.fuubar_progress_bar_options = { :format => 'My Fuubar! <%B> %p%% %a' }

would make it so that, when fuubar is output, it would look something like:

My Fuubar! <================================                  > 53.44% 00:12:31

Hiding Pending/Skipped Spec Summary

By default fuubar follows RSpec's lead and will dump out a summary of all of the pending specs in the suite once the test run is over. This is a good idea because the additional noise is a nudge to fix those tests. We realize however that not all teams have the luxury of implementing all of the pending specs and therefore fuubar gives you the option of supressing that summary.


# spec/spec_helper.rb

RSpec.configure do |config|
  config.fuubar_output_pending_results = false

Enabling Auto-Refresh

By default fuubar refreshes the bar only between each spec. You can enable an auto-refresh feature that will keep refreshing the bar (and therefore the ETA) every second. You can enable the feature as follows:

# spec/spec_helper.rb

RSpec.configure do |config|
  config.fuubar_auto_refresh = true

Undesirable effects

Unfortunately this option doesn't play well with things like debuggers, as having a bar show up every second would be undesireable (which is why the feature is disabled by default). Depending on what you are using, you may be given ways to work around this problem.


Pry provides hooks that can be used to disable fuubar during a debugging session, you could for example add the following to your spec helper:

# spec/spec_helper.rb

Pry.config.hooks.add_hook(:before_session, :disable_fuubar_auto_refresh) do |_output, _binding, _pry|
  RSpec.configuration.fuubar_auto_refresh = false

Pry.config.hooks.add_hook(:after_session, :restore_fuubar_auto_refresh) do |_output, _binding, _pry|
  RSpec.configuration.fuubar_auto_refresh = true

Unfortunately byebug does not provide hooks, so your best bet is to disable auto-refresh manually before calling byebug.

RSpec.configuration.fuubar_auto_refresh = false


fuubar is cryptographically signed. To be sure the gem you install hasn’t been tampered with, follow these steps:

  1. Add my public key (if you haven’t already) as a trusted certificate
gem cert --add <(curl -Ls https://raw.github.com/thekompanee/fuubar/master/certs/thekompanee.pem)
  1. Install fuubar telling it to use security checks when possible.
gem install fuubar -P MediumSecurity

Note: The MediumSecurity trust profile will verify signed gems, but allow the installation of unsigned dependencies.

This is necessary because fuubar has a dependency on RSpec which isn't signed, and therefore we cannot use HighSecurity, which requires signed gems.


fuubar was written by Jeff Felchner and Jeff Kreeftmeijer

The Kompanee

fuubar is maintained and funded by The Kompanee, Ltd.

The names and logos for The Kompanee are trademarks of The Kompanee, Ltd.


fuubar is Copyright © 2010-2019 Jeff Kreeftmeijer and Jeff Felchner. It is free software, and may be redistributed under the terms specified in the LICENSE file.

*Note that all licence references and agreements mentioned in the Fuubar README section above are relevant to that project's source code only.