feat: Add configurable interval for IMAP sync (#9302)

spec/services/imap/microsoft_fetch_email_service_spec.rb

@@ -50,5 +50,31 @@ RSpec.describe Imap::MicrosoftFetchEmailService do
         end
       end
     end
+
+    context 'when the interval is passed during an IMAP Sync' do
+      it 'fetches the emails based on the interval specified in the job' do
+        travel_to '26.10.2020 10:00'.to_datetime do
+          email_object = create_inbound_email_from_fixture('only_text.eml')
+          email_header = Net::IMAP::FetchData.new(1, 'BODY[HEADER]' => eml_content_with_message_id)
+          imap_fetch_mail = Net::IMAP::FetchData.new(1, 'RFC822' => eml_content_with_message_id)
+
+          allow(imap).to receive(:search).with(%w[SINCE 18-Oct-2020]).and_return([1])
+          allow(imap).to receive(:fetch).with([1], 'BODY.PEEK[HEADER]').and_return([email_header])
+          allow(imap).to receive(:fetch).with(1, 'RFC822').and_return([imap_fetch_mail])
+          allow(imap).to receive(:logout)
+
+          result = described_class.new(channel: microsoft_channel, interval: 8).perform
+
+          expect(refresh_token_service).to have_received(:access_token)
+
+          expect(result.length).to eq 1
+          expect(result[0].message_id).to eq email_object.message_id
+          expect(imap).to have_received(:search).with(%w[SINCE 18-Oct-2020])
+          expect(imap).to have_received(:fetch).with([1], 'BODY.PEEK[HEADER]')
+          expect(imap).to have_received(:fetch).with(1, 'RFC822')
+          expect(logger).to have_received(:info).with("[IMAP::FETCH_EMAIL_SERVICE] Fetching mails from #{microsoft_channel.email}, found 1.")
+        end
+      end
+    end
   end
 end