chore: Provider APIs for SMS Channel - Bandwidth (#3889)

fixes: #3888

spec/services/sms/incoming_message_service_spec.rb

@@ -0,0 +1,31 @@
+require 'rails_helper'
+
+describe Sms::IncomingMessageService do
+  describe '#perform' do
+    let!(:sms_channel) { create(:channel_sms) }
+
+    context 'when valid text message params' do
+      it 'creates appropriate conversations, message and contacts' do
+        params =  {
+
+          'id': '3232420-2323-234324',
+          'owner': sms_channel.phone_number,
+          'applicationId': '2342349-324234d-32432432',
+          'time': '2022-02-02T23:14:05.262Z',
+          'segmentCount': 1,
+          'direction': 'in',
+          'to': [
+            sms_channel.phone_number
+          ],
+          'from': '+14234234234',
+          'text': 'test message'
+
+        }.with_indifferent_access
+        described_class.new(inbox: sms_channel.inbox, params: params).perform
+        expect(sms_channel.inbox.conversations.count).not_to eq(0)
+        expect(Contact.all.first.name).to eq('+1 423-423-4234')
+        expect(sms_channel.inbox.messages.first.content).to eq('test message')
+      end
+    end
+  end
+end