Adding snapshot testing to RSpec, inspired by Jest.

Add this line to your application's Gemfile:

gem 'rspec-snapshot'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rspec-snapshot

RSpec.configure do |config|
  # The default setting is `:relative`, which means snapshots will be generate to
  # the relative path of the spec file.
  config.snapshot_dir = "spec/fixtures/snapshots"
end

RSpec.describe "Posts", type: :request do
  describe "GET /posts" do
    it "returns a list of post" do
      get posts_path

      expect(response.body).to match_snapshot("get_posts")
    end
  end
end

RSpec.describe "widgets/index", type: :view do
  it "displays all the widgets" do
    assign(:widgets, [
      Widget.create!(:name => "slicer"),
      Widget.create!(:name => "dicer")
    ])

    render

    expect(rendered).to match_snapshot("widgets/index")
  end
end

Use your imagination for other usages!

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/yesmeck/rspec-snapshot.