A Minitest Plugin which uses difftastic (via difftastic-ruby) to show the diffs for failing assertions.

Also works for Rails tests using ActiveSupport::TestCase.

Clone this repo, run bundle install and then rake examples in your terminal.

rake examples

You will get a few failing assertions printed to your terminal.

Failure:
Examples::AssertEqual#test_assert_equal [examples/assert_equal.rb:8]:

Expected                      Actual
1 "Hello World"               1 "Hello Difftastic"

You can also look at the source code for the examples in the examples/ folder.

Install the gem and add to the application's Gemfile test group by executing:

bundle add minitest-difftastic --group=test

If bundler is not being used to manage dependencies, install the gem by executing:

gem install minitest-difftastic

The plugin will be automatically detected and picked up by Minitest if you have it added to the Gemfile of your application.

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the 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/marcoroth/minitest-difftastic. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

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