Add status reopen activity message for api channel (#6839)

spec/controllers/api/v1/accounts/conversations/messages_controller_spec.rb

@@ -80,6 +80,32 @@ RSpec.describe 'Conversation Messages API', type: :request do
         expect(conversation.messages.last.attachments.first.file.present?).to be(true)
         expect(conversation.messages.last.attachments.first.file_type).to eq('image')
       end
+
+      context 'when api inbox' do
+        let(:api_channel) { create(:channel_api, account: account) }
+        let(:api_inbox) { create(:inbox, channel: api_channel, account: account) }
+        let(:inbox_member) { create(:inbox_member, user: agent, inbox: api_inbox) }
+        let(:conversation) { create(:conversation, inbox: api_inbox, account: account) }
+
+        it 'reopens the conversation with new incoming message' do
+          create(:message, conversation: conversation, account: account)
+          conversation.resolved!
+
+          params = { content: 'test-message', private: false, message_type: 'incoming' }
+
+          post api_v1_account_conversation_messages_url(account_id: account.id, conversation_id: conversation.display_id),
+               params: params,
+               headers: agent.create_new_auth_token,
+               as: :json
+
+          expect(response).to have_http_status(:success)
+          expect(conversation.reload.status).to eq('open')
+          expect(Conversations::ActivityMessageJob)
+            .to(have_been_enqueued.at_least(:once)
+              .with(conversation, { account_id: conversation.account_id, inbox_id: conversation.inbox_id, message_type: :activity,
+                                    content: 'System reopened the conversation due to a new incoming message.' }))
+        end
+      end
     end
 
     context 'when it is an authenticated agent bot' do