Add JS console errors check (#28682)

lib/tasks/spec.rake

@@ -3,6 +3,8 @@
 if Rake::Task.task_defined?('spec:system')
   namespace :spec do
     task :enable_system_specs do # rubocop:disable Rails/RakeEnvironment
+      ENV['LOCAL_DOMAIN'] = 'localhost:3000'
+      ENV['LOCAL_HTTPS'] = 'false'
       ENV['RUN_SYSTEM_SPECS'] = 'true'
     end
   end

spec/support/javascript_errors.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+RSpec.configure do |config|
+  config.after(:each, type: :system) do
+    errors = page.driver.browser.logs.get(:browser)
+    if errors.present?
+      aggregate_failures 'javascript errrors' do
+        errors.each do |error|
+          expect(error.level).to_not eq('SEVERE'), error.message
+          next unless error.level == 'WARNING'
+
+          $stderr.warn 'WARN: javascript warning'
+          $stderr.warn error.message
+        end
+      end
+    end
+  end
+end