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rails--rails/railties/lib/rails/test_help.rb
eileencodes 26821d9b57 Add test parallelization to Rails
Provides both a forked process and threaded parallelization options. To
use add `parallelize` to your test suite.

Takes a `workers` argument that controls how many times the process
is forked. For each process a new database will be created suffixed
with the worker number; test-database-0 and test-database-1
respectively.

If `ENV["PARALLEL_WORKERS"]` is set the workers argument will be ignored
and the environment variable will be used instead. This is useful for CI
environments, or other environments where you may need more workers than
you do for local testing.

If the number of workers is set to `1` or fewer, the tests will not be
parallelized.

The default parallelization method is to fork processes. If you'd like to
use threads instead you can pass `with: :threads` to the `parallelize`
method. Note the threaded parallelization does not create multiple
database and will not work with system tests at this time.

parallelize(workers: 2, with: :threads)

The threaded parallelization uses Minitest's parallel exector directly.
The processes paralleliztion uses a Ruby Drb server.

For parallelization via threads a setup hook and cleanup hook are
provided.

```
class ActiveSupport::TestCase
  parallelize_setup do |worker|
    # setup databases
  end

  parallelize_teardown do |worker|
    # cleanup database
  end

  parallelize(workers: 2)
end
```

[Eileen M. Uchitelle, Aaron Patterson]
2018-02-15 19:21:24 -05:00

49 lines
1.2 KiB
Ruby

# frozen_string_literal: true
# Make double-sure the RAILS_ENV is not set to production,
# so fixtures aren't loaded into that environment
abort("Abort testing: Your Rails environment is running in production mode!") if Rails.env.production?
require "active_support/test_case"
require "action_controller"
require "action_controller/test_case"
require "action_dispatch/testing/integration"
require "rails/generators/test_case"
require "active_support/testing/autorun"
if defined?(ActiveRecord::Base)
begin
ActiveRecord::Migration.maintain_test_schema!
rescue ActiveRecord::PendingMigrationError => e
puts e.to_s.strip
exit 1
end
module ActiveSupport
class TestCase
include ActiveRecord::TestDatabases
include ActiveRecord::TestFixtures
self.fixture_path = "#{Rails.root}/test/fixtures/"
self.file_fixture_path = fixture_path + "files"
end
end
ActionDispatch::IntegrationTest.fixture_path = ActiveSupport::TestCase.fixture_path
end
# :enddoc:
class ActionController::TestCase
def before_setup # :nodoc:
@routes = Rails.application.routes
super
end
end
class ActionDispatch::IntegrationTest
def before_setup # :nodoc:
@routes = Rails.application.routes
super
end
end