feat(ee): Add copilot integration (v1) to the conversation sidebar (#10566)

spec/services/llm_formatter/conversation_llm_formatter_spec.rb

@@ -0,0 +1,51 @@
+require 'rails_helper'
+
+RSpec.describe LlmFormatter::ConversationLlmFormatter do
+  let(:account) { create(:account) }
+  let(:conversation) { create(:conversation, account: account) }
+  let(:formatter) { described_class.new(conversation) }
+
+  describe '#format' do
+    context 'when conversation has no messages' do
+      it 'returns basic conversation info with no messages' do
+        expected_output = [
+          "Conversation ID: ##{conversation.display_id}",
+          "Channel: #{conversation.inbox.channel.name}",
+          'Message History:',
+          'No messages in this conversation'
+        ].join("\n")
+
+        expect(formatter.format).to eq(expected_output)
+      end
+    end
+
+    context 'when conversation has messages' do
+      it 'formats messages in chronological order with sender labels' do
+        create(
+          :message,
+          conversation: conversation,
+          message_type: 'incoming',
+          content: 'Hello, I need help'
+        )
+
+        create(
+          :message,
+          conversation: conversation,
+          message_type: 'outgoing',
+          content: 'How can I assist you today?'
+        )
+
+        expected_output = [
+          "Conversation ID: ##{conversation.display_id}",
+          "Channel: #{conversation.inbox.channel.name}",
+          'Message History:',
+          'User: Hello, I need help',
+          'Support agent: How can I assist you today?',
+          ''
+        ].join("\n")
+
+        expect(formatter.format).to eq(expected_output)
+      end
+    end
+  end
+end