feat: add activity message for SLA (#9100)

* feat: add activity message for SLA

* chore: refactor to reduce method complexity

* chore: refactor

* feat: add spec for SLAactivity message

* chore: move SLA spec to enterprise folder

* chore: move team activity methods to a separate module

* chore: fix typo

* chore: move sla activity message spec to conversation model

spec/enterprise/models/conversation_spec.rb

@@ -5,6 +5,36 @@ RSpec.describe Conversation, type: :model do
     it { is_expected.to belong_to(:sla_policy).optional }
   end
 
+  describe 'SLA policy updates' do
+    let!(:conversation) { create(:conversation) }
+    let!(:sla_policy) { create(:sla_policy) }
+
+    it 'generates an activity message when the SLA policy is updated' do
+      conversation.update(sla_policy_id: sla_policy.id)
+
+      perform_enqueued_jobs
+
+      activity_message = conversation.messages.where(message_type: 'activity').last
+
+      expect(activity_message).not_to be_nil
+      expect(activity_message.message_type).to eq('activity')
+      expect(activity_message.content).to include('added SLA policy')
+    end
+
+    it 'generates an activity message when the SLA policy is removed' do
+      conversation.update(sla_policy_id: sla_policy.id)
+      conversation.update(sla_policy_id: nil)
+
+      perform_enqueued_jobs
+
+      activity_message = conversation.messages.where(message_type: 'activity').last
+
+      expect(activity_message).not_to be_nil
+      expect(activity_message.message_type).to eq('activity')
+      expect(activity_message.content).to include('removed SLA policy')
+    end
+  end
+
   describe 'conversation sentiments' do
     include ActiveJob::TestHelper