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

fixes: #3888

spec/builders/contact_inbox_builder_spec.rb

@@ -99,6 +99,53 @@ describe ::ContactInboxBuilder do
       end
     end
 
+    describe 'sms inbox' do
+      let!(:sms_channel) { create(:channel_sms, account: account) }
+      let!(:sms_inbox) { create(:inbox, channel: sms_channel, account: account) }
+
+      it 'does not create contact inbox when contact inbox already exists with the source id provided' do
+        existing_contact_inbox = create(:contact_inbox, contact: contact, inbox: sms_inbox, source_id: contact.phone_number)
+        contact_inbox = described_class.new(
+          contact_id: contact.id,
+          inbox_id: sms_inbox.id,
+          source_id: contact.phone_number
+        ).perform
+
+        expect(contact_inbox.id).to be(existing_contact_inbox.id)
+      end
+
+      it 'does not create contact inbox when contact inbox already exists with phone number and source id is not provided' do
+        existing_contact_inbox = create(:contact_inbox, contact: contact, inbox: sms_inbox, source_id: contact.phone_number)
+        contact_inbox = described_class.new(
+          contact_id: contact.id,
+          inbox_id: sms_inbox.id
+        ).perform
+
+        expect(contact_inbox.id).to be(existing_contact_inbox.id)
+      end
+
+      it 'creates a new contact inbox when different source id is provided' do
+        existing_contact_inbox = create(:contact_inbox, contact: contact, inbox: sms_inbox, source_id: contact.phone_number)
+        contact_inbox = described_class.new(
+          contact_id: contact.id,
+          inbox_id: sms_inbox.id,
+          source_id: '+224213223422'
+        ).perform
+
+        expect(contact_inbox.id).not_to be(existing_contact_inbox.id)
+        expect(contact_inbox.source_id).not_to be('+224213223422')
+      end
+
+      it 'creates a contact inbox with contact phone number when source id not provided and no contact inbox exists' do
+        contact_inbox = described_class.new(
+          contact_id: contact.id,
+          inbox_id: sms_inbox.id
+        ).perform
+
+        expect(contact_inbox.source_id).not_to be(contact.phone_number)
+      end
+    end
+
     describe 'email inbox' do
       let!(:email_channel) { create(:channel_email, account: account) }
       let!(:email_inbox) { create(:inbox, channel: email_channel, account: account) }