chore: refine Rails.root.join stub in spec

app/models/inbox.rb

@@ -53,6 +53,7 @@ class Inbox < ApplicationRecord
   validates :out_of_office_message, length: { maximum: Limits::OUT_OF_OFFICE_MESSAGE_MAX_LENGTH }
   validates :greeting_message, length: { maximum: Limits::GREETING_MESSAGE_MAX_LENGTH }
   validate :ensure_valid_max_assignment_limit
+  validate :ensure_inbox_limit, on: :create
 
   belongs_to :account
   belongs_to :portal, optional: true
@@ -237,6 +238,16 @@ class Inbox < ApplicationRecord
     # overridden in enterprise/app/models/enterprise/inbox.rb
   end
 
+  def ensure_inbox_limit
+    return unless account
+
+    inbox_limit = account.usage_limits[:inboxes]
+    return if inbox_limit.nil?
+    return unless account.inboxes.count >= inbox_limit.to_i
+
+    errors.add(:base, 'Account inbox limit exceeded. Upgrade to a higher plan')
+  end
+
   def delete_round_robin_agents
     ::AutoAssignment::InboxRoundRobinService.new(inbox: self).clear_queue
   end

spec/lib/captain/base_task_service_spec.rb

@@ -280,7 +280,10 @@ RSpec.describe Captain::BaseTaskService do
 
   describe '#prompt_from_file' do
     it 'reads prompt from file' do
-      allow(Rails.root).to receive(:join).and_return(instance_double(Pathname, read: 'Test prompt content'))
+      allow(Rails.root).to receive(:join).and_call_original
+      allow(Rails.root).to receive(:join)
+        .with('lib/integrations/openai/openai_prompts', 'test.liquid')
+        .and_return(instance_double(Pathname, read: 'Test prompt content'))
       expect(service.send(:prompt_from_file, 'test')).to eq('Test prompt content')
     end
   end