1 files changed, 38 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/test_databases.rb b/activerecord/lib/active_record/test_databases.rb
new file mode 100644
index 0000000000..999830ba79
--- /dev/null
+++ b/activerecord/lib/active_record/test_databases.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+require "active_support/testing/parallelization"
+
+module ActiveRecord
+  module TestDatabases # :nodoc:
+    ActiveSupport::Testing::Parallelization.after_fork_hook do |i|
+      create_and_load_schema(i, env_name: Rails.env)
+    end
+
+    ActiveSupport::Testing::Parallelization.run_cleanup_hook do
+      drop(env_name: Rails.env)
+    end
+
+    def self.create_and_load_schema(i, env_name:)
+      old, ENV["VERBOSE"] = ENV["VERBOSE"], "false"
+
+      ActiveRecord::Base.configurations.configs_for(env_name: env_name).each do |db_config|
+        db_config.config["database"] += "-#{i}"
+        ActiveRecord::Tasks::DatabaseTasks.create(db_config.config)
+        ActiveRecord::Tasks::DatabaseTasks.load_schema(db_config.config, ActiveRecord::Base.schema_format, nil, env_name, db_config.spec_name)
+      end
+    ensure
+      ActiveRecord::Base.establish_connection(Rails.env.to_sym)
+      ENV["VERBOSE"] = old
+    end
+
+    def self.drop(env_name:)
+      old, ENV["VERBOSE"] = ENV["VERBOSE"], "false"
+
+      ActiveRecord::Base.configurations.configs_for(env_name: env_name).each do |db_config|
+        ActiveRecord::Tasks::DatabaseTasks.drop(db_config.config)
+      end
+    ensure
+      ENV["VERBOSE"] = old
+    end
+  end
+end