Test that we are only using 1 worker for GoodJob user creation.

Author: fspeirs

config/initializers/good_job.rb

@@ -16,5 +16,7 @@ def authenticate_admin
 
 Rails.application.configure do
   # The create_students_job queue is a serial queue that allows only one job at a time.
+  # DO NOT change the the value of create_students_job:1 without understanding the implications
+  # of processing more than one user creation job at once.:
   config.good_job.queues = 'create_students_job:1;default:5'
 end

spec/configuration/rails_config_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Rails do
+  it 'ensures the create_students_job queue only has one worker' do
+    queues_config = described_class.application.config.good_job.queues
+    # queues_config is a string like "create_students_job:1;default:5"
+
+    # Parse the queues into a hash
+    parsed_queues = queues_config.split(';').to_h do |q|
+      name, concurrency = q.split(':')
+      [name, concurrency.to_i]
+    end
+
+    expect(parsed_queues['create_students_job']).to eq(1)
+  end
+end