Refactor domain mailer views

#180

spec/views/mailers/shared/registrant/registrant_shared.rb

@@ -0,0 +1,25 @@
+require 'rails_helper'
+
+RSpec.shared_examples 'domain mailer registrant info' do
+  let(:registrant) { instance_spy(RegistrantPresenter) }
+
+  before :example do
+    allow(view).to receive(:registrant).and_return(registrant)
+  end
+
+  attributes = %i(
+    name
+    ident
+    street
+    city
+    country
+  )
+
+  attributes.each do |attr_name|
+    it "has #{attr_name}" do
+      expect(registrant).to receive(attr_name).and_return("test #{attr_name}")
+      render
+      expect(rendered).to have_text("test #{attr_name}")
+    end
+  end
+end