Allow parallel testing
Rails 6.0 or later supports parallel testing. Enabling this feature can reduce the time required for testing and improve development efficiency.
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%.
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
The reason why the number of workers is set to 1 is that parallel testing causes some errors in system test.