Feature #35030
Updated by Go MAEDA over 3 years ago
Rails 6.0 or later supports parallel testing. Enabling this feature can reduce the time required for testing and improve development efficiency. https://guides.rubyonrails.org/testing.html#parallel-testing https://guides.rubyonrails.org/testing.html#parallel-testing-with-threads By applying the following patch and run the test suite with @PARALLEL_WORKERS=6@ environment variable in my environment, the time required to run the test suite was reduced to about 30%. <pre><code class="diff"> diff --git a/test/test_helper.rb b/test/test_helper.rb index 10f4f6e35..95b877d44 100644 --- a/test/test_helper.rb +++ b/test/test_helper.rb @@ -53,6 +53,8 @@ class ActionView::TestCase end class ActiveSupport::TestCase + parallelize(workers: 1) + include ActionDispatch::TestProcess self.use_transactional_tests = true </code></pre> The reason why the number of workers is set to 1 is that parallel testing causes some errors in system test.