Extract contact Transferable concern

#660

test/models/contact_test.rb

@@ -0,0 +1,44 @@
+require 'test_helper'
+
+class ContactTest < ActiveSupport::TestCase
+  def setup
+    @contact = contacts(:john)
+    @new_registrar = registrars(:goodnames)
+  end
+
+  def test_validates
+    assert @contact.valid?
+  end
+
+  def test_transfer_keeps_original_contact_untouched
+    original_hash = @contact.to_json
+    new_contact = @contact.transfer(@new_registrar)
+    refute_equal original_hash, new_contact.to_json
+  end
+
+  def test_transfer_creates_new_contact
+    assert_difference 'Contact.count' do
+      @contact.transfer(@new_registrar)
+    end
+  end
+
+  def test_transfer_changes_registrar
+    new_contact = @contact.transfer(@new_registrar)
+    assert_equal @new_registrar, new_contact.registrar
+  end
+
+  def test_transfer_links_to_original
+    new_contact = @contact.transfer(@new_registrar)
+    assert_equal @contact, new_contact.original
+  end
+
+  def test_transfer_regenerates_new_code
+    new_contact = @contact.transfer(@new_registrar)
+    refute_equal @contact.code, new_contact.code
+  end
+
+  def test_transfer_regenerates_auth_info
+    new_contact = @contact.transfer(@new_registrar)
+    refute_equal @contact.auth_info, new_contact.auth_info
+  end
+end