tests: enable parallel tests.

.github/workflows/test.yaml

@@ -11,6 +11,7 @@ jobs:
       DEBIAN_FRONTEND: noninteractive
       DATABASE_URL: postgresql://danbooru:danbooru@postgres/danbooru
       ARCHIVE_DATABASE_URL: postgresql://danbooru:danbooru@postgres/danbooru
+      PARALLEL_WORKERS: 8 # number of parallel tests to run
       DANBOORU_SECRET_KEY_BASE: 1234
       DANBOORU_AWS_SQS_ENABLED: false
       DANBOORU_TWITTER_API_KEY: ${{ secrets.DANBOORU_TWITTER_API_KEY }}

config/docker/docker-compose.test.yaml

@@ -15,6 +15,7 @@ services:
     environment:
       - DATABASE_URL=postgresql://danbooru:danbooru@postgres/danbooru
       - ARCHIVE_DATABASE_URL=postgresql://danbooru:danbooru@postgres/danbooru
+      - PARALLEL_WORKERS=8 # number of parallel tests to run
       - DANBOORU_SECRET_KEY_BASE=1234
       - DANBOORU_AWS_SQS_ENABLED
       - DANBOORU_TWITTER_API_KEY

test/test_helper.rb

@@ -67,6 +67,11 @@ class ActiveSupport::TestCase
   mock_post_version_service!
   mock_pool_version_service!
 
+  parallelize
+  parallelize_setup do
+    Rails.application.load_seed
+  end
+
   setup do
     Socket.stubs(:gethostname).returns("www.example.com")
     mock_popular_search_service!