Getting Started

SuperDiff is designed to be used different ways, depending on the type of project.

Using SuperDiff with RSpec in a Rails app

If you’re developing a Rails app, run the following command to add SuperDiff to your project:

bundle add super_diff --group test

Then add the following toward the top of spec/rails_helper.rb:

require "super_diff/rspec-rails"

At this point, you can write tests for parts of your app, and SuperDiff will be able to diff Rails-specific objects such as ActiveRecord models, ActionController response objects, instances of HashWithIndifferentAccess, etc., in addition to objects that ship with RSpec, such as matchers.

You can now continue on to customizing SuperDiff.

Using SuperDiff with RSpec in a project using parts of Rails

If you’re developing an app using Hanami or Sinatra, or merely using a part of Rails such as ActiveModel, run the following command to add SuperDiff to your project:

bundle add super_diff

After running bundle install, add the following toward the top of spec/spec_helper.rb:

require "super_diff/rspec"

Then, add one or all of the following lines:

require "super_diff/active_support"
require "super_diff/active_record"

At this point, you can write tests for parts of your app, and SuperDiff will be able to diff objects depending on which path you required. For instance, if you required super_diff/active_support, then SuperDiff will be able to diff objects defined in ActiveSupport, such as HashWithIndifferentAccess, and if you required super_diff/active_record, it will be able to diff ActiveRecord models. In addition to these, it will also be able to diff objects that ship with RSpec, such as matchers.

You can now continue on to customizing SuperDiff.

Using SuperDiff with RSpec in a Ruby project

If you’re developing a library or other project that does not depend on any part of Rails, run the following command to add SuperDiff to your project:

bundle add super_diff

Now add the following toward the top of spec/spec_helper.rb:

require "super_diff/rspec"

At this point, you can write tests for parts of your app, and SuperDiff will be able to diff objects that ship with RSpec, such as matchers.

You can now continue on to customizing SuperDiff.

Using parts of SuperDiff directly

Although SuperDiff is primarily designed to integrate with RSpec, it can also be used on its own in other kinds of applications.

First, install the gem:

bundle add super_diff

Then, require it somewhere:

require "super_diff"

If you want to compare two objects and display a friendly diff, you can use the equality matcher interface:

SuperDiff::EqualityMatchers::Main.call(expected, actual)

Or, if you want to compare two objects and get a lower-level list of operations, you can use the differ interface:

SuperDiff::Differs::Main.call(expected, actual)