InterfaceComparator

Add this line to your application's Gemfile:

gem 'interface_comparator'

And then execute:

$ bundle

Or install it yourself as:

$ gem install interface_comparator

require 'interface_comparator'
# check if two objects has the same interface
# including public methods list and their arity
InterfaceComparator.same?(a, b) # => true or false

# see detailed list of difference between interfaces
# of two objects
InterfaceComparator.diff(a, b)
# if there are difference between methods
# it will return them in aa array of hashes:
#[{
#    method: :new_method,
#    first_object: true,
#    second_object: false
#}]
#
# if there are not difference between methods
# but there are differences in arity of them
# it will return them in an array of hashes:
#[{
#    method: :new_method,
#    first_object_arity: 1,
#    second_object_arity: 0
#}]

If you want to use it with minitest, please require helper:

require 'interface_comparator/minitest'

Library will provide you with two new assertions:

assert_equal_interfaces a, b
refute_equal_interfaces a, b

Output in case of failure will be similar to those in diff.

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 tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/esse/interface_comparator. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the InterfaceComparator project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.