feat: add spec for chat_service

spec/enterprise/services/captain/copilot/chat_service_spec.rb

@@ -0,0 +1,30 @@
+require 'rails_helper'
+
+RSpec.describe Captain::Copilot::ChatService do
+  let(:account) { create(:account, custom_attributes: { plan_name: 'startups' }) }
+  let(:inbox) { create(:inbox, account: account) }
+  let(:assistant) { create(:captain_assistant, account: account) }
+  let!(:captain_inbox_association) { create(:captain_inbox, captain_assistant: assistant, inbox: inbox) }
+
+  let(:mock_captain_agent) { double('Captain::Agent') }
+  let(:mock_captain_tool) { double('Captain::Tool') }
+
+  describe '#execure' do
+    before do
+      create(:installation_config) { create(:installation_config, name: 'CAPTAIN_OPEN_AI_API_KEY', value: 'test-key') }
+      allow(Captain::Agent).to receive(:new).and_return(mock_captain_agent)
+      allow(mock_captain_agent).to receive(:execute).and_return(true)
+      allow(mock_captain_agent).to receive(:register_tool).and_return(true)
+
+      allow(Captain::Tool).to receive(:new).and_return(mock_captain_tool)
+      allow(mock_captain_tool).to receive(:register_method).and_return(true)
+
+      allow(account).to receive(:increment_response_usage).and_return(true)
+    end
+
+    it 'increments usage' do
+      described_class.new(assistant, { previous_messages: 'Hello', conversation_history: 'Hi' }).execute('Hey')
+      expect(account).to have_received(:increment_response_usage).once
+    end
+  end
+end