Added support parallel_tests (#2740)

- Added new gem the `parallel_tests`.
- Updated .travis.yml.
  - Improved scripts and environment variable.

.travis.yml

@@ -14,6 +14,9 @@ env:
     - LOCAL_HTTPS=true
     - RAILS_ENV=test
     - CXX=g++-4.8
+    - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
+    - PARALLEL_TEST_PROCESSORS=2
+
 addons:
   postgresql: 9.4
   apt:
@@ -31,7 +34,7 @@ rvm:
 services:
   - redis-server
 
-bundler_args: --without development production --retry=3 --jobs=3
+bundler_args: --without development production --retry=3 --jobs=16
 
 install:
   - nvm install
@@ -40,10 +43,10 @@ install:
   - yarn install
 
 before_script:
-  - bundle exec rails db:create db:schema:load
+  - bundle exec rake parallel:create parallel:load_schema parallel:prepare
   - bundle exec rails assets:precompile
 
 script:
-  - bundle exec rspec
+  - bundle exec parallel_test spec/ --group-by filesize --type rspec
   - npm test
   - i18n-tasks unused

Gemfile

@@ -77,6 +77,7 @@ group :test do
   gem 'rspec-sidekiq'
   gem 'simplecov', require: false
   gem 'webmock'
+  gem 'parallel_tests'
 end
 
 group :development do

Gemfile.lock

@@ -270,6 +270,9 @@ GEM
     paperclip-av-transcoder (0.6.4)
       av (~> 0.9.0)
       paperclip (>= 2.5.2)
+    parallel (1.11.1)
+    parallel_tests (2.14.1)
+      parallel
     parser (2.4.0.0)
       ast (~> 2.2)
     pg (0.20.0)
@@ -510,6 +513,7 @@ DEPENDENCIES
   ox
   paperclip (~> 5.1)
   paperclip-av-transcoder
+  parallel_tests
   pg
   pghero
   pkg-config

config/database.yml

@@ -13,7 +13,7 @@ development:
 # Do not set this db to the same as development or production.
 test:
   <<: *default
-  database: mastodon_test
+  database: mastodon_test<%= ENV['TEST_ENV_NUMBER'] %>
 
 production:
   <<: *default