SimpleCov::Parallel

SimpleCov::Parallel is a SimpleCov extension for parallelism support. It automatically transfers each node coverage data to a single master node and merges the data. Currently only CircleCI parallelism is supported.

Add these lines to your application's Gemfile:

gem 'simplecov-parallel'

And then execute:

$ bundle install

You just need to invoke SimpleCov::Parallel.activate before start tracking coverage:

# spec/spec_helper.rb
require 'simplecov/parallel'
SimpleCov::Parallel.activate
SimpleCov.start

SimpleCov::Parallel automatically detects the best parallelism support for the current environment.

You can use any formatter transparently since SimpleCov::Parallel merges the results into SimpleCov.result, which is a basic API of SimpleCov.

When using SimpleCov::Parallel on CircleCI:

• Add parallel: true to the test command (e.g. rspec) in your circle.yml.
• Set up parallelism for your project from the CircleCI web console.

# circle.yml
test:
  override:
    - bundle exec rspec:
        parallel: true
        files:
          - spec/**/*_spec.rb

The SimpleCov formatter will be executed only on the first node (where CIRCLE_NODE_INDEX is 0).

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