minitest-parallel

This is an extension to minitest which will run your minitest tests in parallel. It is up to you to ensure that there is no shared state which can collide.

This code is pretty much identical at the moment to ngauthier's minitest-parallel project. I needed to make some quick changes to get it working for a talk, so I cloned and pushed instead. But props to him!

WARNING: This is a proof of concept. It works, but is not intended -- in its current form -- to be used for production tests.

Example

require minitest-parallel in your tests:

require "minitest/autorun"
require "minitest/parallel"
require "minitest/unit"

class MyTest < MiniTest::Unit::TestCase
  def test_things
    puts "test_things"
    sleep 2
    assert true
  end
end

class AnotherTest < MiniTest::Unit::TestCase
  def test_other_things
    puts "test_other_things"
    sleep 2
    assert true
  end
end

Run them:

$ ruby my_test.rb
# Running tests:

test_things
test_other_things
..

Finished tests in 2.081270s, 0.9610 tests/s, 0.9610 assertions/s.

2 tests, 2 assertions, 0 failures, 0 errors, 0 skips

Notice that although both tests have a sleep in them, they ran in parallel. By default minitest/parallel will run the number of processes equal to your cores.