rspec parallel tests

To run RSpec tests in parallel in Ruby, you can follow these steps:

Step 1: Install the 'parallel_tests' gem

To begin, you need to install the 'parallel_tests' gem. This gem allows you to run test suites in parallel. You can add it to your Gemfile and run bundle install to install it:

gem 'parallel_tests'

Step 2: Configure your test runner

Next, you need to configure your test runner to use parallel execution. This step may vary depending on the test runner you are using. For example, if you are using RSpec, you can add the following configuration to your spec_helper.rb file:

require 'parallel_tests/rspec/runner'

RSpec.configure do |config|
  config.before(:suite) do
    ParallelTests.first_process? && ParallelTests.wait_for_other_processes_to_finish
  end

  config.before(:each) do
    ParallelTests.wait_for_other_processes_to_finish
  end

  config.after(:each) do
    ParallelTests.wait_for_other_processes_to_finish
  end
end

Step 3: Run the tests in parallel

Once you have configured your test runner, you can run your tests in parallel. To do this, you can use the following command:

bundle exec rake parallel:spec

This command will divide your test suite into multiple groups and run each group in parallel. By default, it will use the number of available CPU cores as the number of groups. You can also specify the number of groups explicitly by adding the --num-cpus option followed by the desired number of groups:

bundle exec rake parallel:spec[--num-cpus=<number_of_groups>]

Step 4: Analyze the results

After running the tests in parallel, you can analyze the results. The 'parallel_tests' gem generates separate output files for each test group. You can find these files in the tmp/parallel_tests directory. Each file contains the test results for the corresponding group.

You can combine the results from all the groups into a single file by running the following command:

bundle exec rake parallel:spec[--combine-stderr]

This command will generate a combined output file in the tmp/parallel_tests directory.

That's it! By following these steps, you should be able to run your RSpec tests in parallel using the 'parallel_tests' gem.