Add first_reply_created event in conversation (#4576)

spec/jobs/migration/conversations_first_reply_scheduler_job_spec.rb

@@ -0,0 +1,48 @@
+require 'rails_helper'
+
+RSpec.describe Migration::ConversationsFirstReplySchedulerJob, type: :job do
+  subject(:job) { described_class.perform_later }
+
+  let!(:account) { create(:account) }
+  let!(:inbox) { create(:inbox, account: account) }
+  let!(:user) { create(:user, account: account) }
+
+  it 'enqueues the job' do
+    expect { job }.to have_enqueued_job(described_class)
+      .on_queue('scheduled_jobs')
+  end
+
+  context 'when there is an outgoing message in conversation' do
+    let!(:conversation) { create(:conversation, account: account, inbox: inbox, assignee: user) }
+    let!(:message) do
+      create(:message, content: 'Hi', message_type: 'outgoing', account: account, inbox: inbox,
+                       conversation: conversation)
+    end
+
+    it 'updates the conversation first reply with the first outgoing message created time' do
+      create(:message, content: 'Hello', message_type: 'outgoing', account: account, inbox: inbox,
+                       conversation: conversation)
+
+      described_class.perform_now(account)
+      conversation.reload
+
+      expect(conversation.messages.count).to eq 2
+      expect(conversation.first_reply_created_at.to_i).to eq message.created_at.to_i
+    end
+  end
+
+  context 'when there is no outgoing message in conversation' do
+    let!(:conversation) { create(:conversation, account: account, inbox: inbox, assignee: user) }
+
+    it 'updates the conversation first reply with nil' do
+      create(:message, content: 'Hello', message_type: 'incoming', account: account, inbox: inbox,
+                       conversation: conversation)
+
+      described_class.perform_now(account)
+      conversation.reload
+
+      expect(conversation.messages.count).to eq 1
+      expect(conversation.first_reply_created_at).to be_nil
+    end
+  end
+end