Merge branch 'skip_active_job_callbacks_in_test_env' into 'master'

Skip ActiveJob reloading callback in test env

See merge request gitlab-org/gitlab!40840

config/initializers/remove_active_job_execute_callback.rb

+# frozen_string_literal: true
+
+return unless Rails.env.test?
+
+Rails.application.configure do
+  config.after_initialize do
+    # We don't care about ActiveJob reloading the code in test env as we run
+    # jobs inline in test env.
+    # So in test, we remove this callback, which calls app.reloader.wrap, and
+    # ultimately calls FileUpdateChecker#updated? which is slow on macOS
+    #
+    # https://github.com/rails/rails/blob/6-0-stable/activejob/lib/active_job/railtie.rb#L39-L46
+    def active_job_railtie_callback?
+      callbacks = ActiveJob::Callbacks.singleton_class.__callbacks[:execute]
+
+      callbacks &&
+        callbacks.send(:chain).size == 1 &&
+        callbacks.first.kind == :around &&
+        callbacks.first.raw_filter.is_a?(Proc) &&
+        callbacks.first.raw_filter.source_location.first.ends_with?('lib/active_job/railtie.rb')
+    end
+
+    if active_job_railtie_callback?
+      ActiveJob::Callbacks.singleton_class.reset_callbacks(:execute)
+    end
+  end
+end

spec/initializers/remove_active_job_execute_callback_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'ActiveJob execute callback' do
+  it 'is removed in test environment' do
+    expect(ActiveJob::Callbacks.singleton_class.__callbacks[:execute].send(:chain).size).to eq(0)
+  end
+end