Improve RegistrantChangeMailer

- Do not show registrant address unless "address_processing" is enabled
- Add missing registrant state and zip attributes

#480

spec/presenters/registrant_presenter_spec.rb

@@ -4,29 +4,61 @@ RSpec.describe RegistrantPresenter do
   let(:registrant) { instance_double(Registrant) }
   let(:presenter) { described_class.new(registrant: registrant, view: view) }
 
-  registrant_delegate_attributes = %i(
+  describe '#country' do
+    let(:country) { instance_double(Country) }
+
+    before :example do
+      allow(registrant).to receive(:country).and_return(country)
+    end
+
+    it 'returns country name in current locale by default' do
+      expect(country).to receive(:translation).with(I18n.locale).and_return('test country')
+      expect(presenter.country).to eq('test country')
+    end
+
+    it 'returns country name in given locale' do
+      expect(country).to receive(:translation).with(:de).and_return('test country')
+      expect(presenter.country(locale: :de)).to eq('test country')
+    end
+  end
+
+  describe '#ident_country' do
+    let(:ident_country) { instance_double(Country) }
+
+    before :example do
+      allow(registrant).to receive(:ident_country).and_return(ident_country)
+    end
+
+    it 'returns country name in current locale by default' do
+      expect(ident_country).to receive(:translation).with(I18n.locale).and_return('test country')
+      expect(presenter.ident_country).to eq('test country')
+    end
+
+    it 'returns country name in given locale' do
+      expect(ident_country).to receive(:translation).with(:de).and_return('test country')
+      expect(presenter.ident_country(locale: :de)).to eq('test country')
+    end
+  end
+
+  registrant_delegatable_attributes = %i(
     name
     ident
     email
     priv?
     street
     city
+    state
+    zip
     id_code
     reg_no
   )
 
-  registrant_delegate_attributes.each do |attribute_name|
-    describe "##{attribute_name}" do
-      it 'delegetes to registrant' do
-        expect(registrant).to receive(attribute_name).and_return('test')
-        expect(presenter.send(attribute_name)).to eq('test')
+  registrant_delegatable_attributes.each do |attr_name|
+    describe "##{attr_name}" do
+      it 'delegates to registrant' do
+        expect(registrant).to receive(attr_name).and_return('test')
+        expect(presenter.send(attr_name)).to eq('test')
       end
     end
   end
-
-  describe '#country' do
-    it 'returns country name' do
-      expect(presenter.country).to be_nil
-    end
-  end
 end