Add Ruby 3.0 support (#16046)

* Fix issues with POSIX::Spawn, Terrapin and Ruby 3.0

Also improve the Terrapin monkey-patch for the stderr/stdout issue.

* Fix keyword argument handling throughout the codebase

* Monkey-patch Paperclip to fix keyword arguments handling in validators

* Change validation_extensions to please CodeClimate

* Bump microformats from 4.2.1 to 4.3.1

* Allow Ruby 3.0

* Add Ruby 3.0 test target to CircleCI

* Add test for admin dashboard warnings

* Fix admin dashboard warnings on Ruby 3.0

spec/controllers/admin/dashboard_controller_spec.rb

@@ -3,9 +3,19 @@
 require 'rails_helper'
 
 describe Admin::DashboardController, type: :controller do
+  render_views
+
   describe 'GET #index' do
-    it 'returns 200' do
+    before do
+      allow(Admin::SystemCheck).to receive(:perform).and_return([
+        Admin::SystemCheck::Message.new(:database_schema_check),
+        Admin::SystemCheck::Message.new(:rules_check, nil, admin_rules_path),
+        Admin::SystemCheck::Message.new(:sidekiq_process_check, 'foo, bar'),
+      ])
       sign_in Fabricate(:user, admin: true)
+    end
+
+    it 'returns 200' do
       get :index
 
       expect(response).to have_http_status(200)

spec/mailers/notification_mailer_spec.rb

@@ -10,12 +10,12 @@ RSpec.describe NotificationMailer, type: :mailer do
     it 'renders subject localized for the locale of the receiver' do
       locale = %i(de en).sample
       receiver.update!(locale: locale)
-      expect(mail.subject).to eq I18n.t(*args, kwrest.merge(locale: locale))
+      expect(mail.subject).to eq I18n.t(*args, **kwrest.merge(locale: locale))
     end
 
     it 'renders subject localized for the default locale if the locale of the receiver is unavailable' do
       receiver.update!(locale: nil)
-      expect(mail.subject).to eq I18n.t(*args, kwrest.merge(locale: I18n.default_locale))
+      expect(mail.subject).to eq I18n.t(*args, **kwrest.merge(locale: I18n.default_locale))
     end
   end
 

spec/mailers/user_mailer_spec.rb

@@ -9,12 +9,12 @@ describe UserMailer, type: :mailer do
     it 'renders subject localized for the locale of the receiver' do
       locale = I18n.available_locales.sample
       receiver.update!(locale: locale)
-      expect(mail.subject).to eq I18n.t(*args, kwrest.merge(locale: locale))
+      expect(mail.subject).to eq I18n.t(*args, **kwrest.merge(locale: locale))
     end
 
     it 'renders subject localized for the default locale if the locale of the receiver is unavailable' do
       receiver.update!(locale: nil)
-      expect(mail.subject).to eq I18n.t(*args, kwrest.merge(locale: I18n.default_locale))
+      expect(mail.subject).to eq I18n.t(*args, **kwrest.merge(locale: I18n.default_locale))
     end
   end
 

spec/models/session_activation_spec.rb

@@ -74,13 +74,13 @@ RSpec.describe SessionActivation, type: :model do
     let(:options) { { user: Fabricate(:user), session_id: '1' } }
 
     it 'calls create! and purge_old' do
-      expect(described_class).to receive(:create!).with(options)
+      expect(described_class).to receive(:create!).with(**options)
       expect(described_class).to receive(:purge_old)
-      described_class.activate(options)
+      described_class.activate(**options)
     end
 
     it 'returns an instance of SessionActivation' do
-      expect(described_class.activate(options)).to be_kind_of SessionActivation
+      expect(described_class.activate(**options)).to be_kind_of SessionActivation
     end
   end
 

spec/presenters/account_relationships_presenter_spec.rb

@@ -13,7 +13,7 @@ RSpec.describe AccountRelationshipsPresenter do
       allow(Account).to receive(:domain_blocking_map).with(account_ids, current_account_id).and_return(default_map)
     end
 
-    let(:presenter)          { AccountRelationshipsPresenter.new(account_ids, current_account_id, options) }
+    let(:presenter)          { AccountRelationshipsPresenter.new(account_ids, current_account_id, **options) }
     let(:current_account_id) { Fabricate(:account).id }
     let(:account_ids)        { [Fabricate(:account).id] }
     let(:default_map)        { { 1 => true } }