Added model test and created helper for E.164 phone format testing

test/models/depp_contact_test.rb

@@ -0,0 +1,14 @@
+require 'test_helper'
+require 'helpers/phone_format_helper_test'
+
+class DeppContactTest < ActiveSupport::TestCase
+  include PhoneFormatHelperTest
+
+  setup do
+    @depp_contact = Depp::Contact.new
+  end
+
+  def test_validates_phone_format
+    assert_phone_format(@depp_contact)
+  end
+end