[SD-841] Adds AddressesHelper#user_available_addresses (#10019)

frontend/app/helpers/spree/addresses_helper.rb

@@ -33,5 +33,11 @@ def address_state(form, country, _address_id = 'b')
       content_tag(:noscript, form.text_field(:state_name, class: 'required')) +
         javascript_tag("document.write(\"<span class='d-block position-relative'>#{state_elements.html_safe}</span>\");")
     end
+
+    def user_available_addresses
+      return unless try_spree_current_user
+
+      try_spree_current_user.addresses.where(country: available_countries)
+    end
   end
 end

frontend/app/views/spree/checkout/_address.html.erb

@@ -1,4 +1,4 @@
-<% @addresses = try_spree_current_user ? try_spree_current_user.addresses : [] %>
+<% @addresses = try_spree_current_user ? user_available_addresses : [] %>
 
 <% if !try_spree_current_user || try_spree_current_user.email.blank? %>
   <div class="row">

frontend/spec/helpers/address_helper_spec.rb

@@ -0,0 +1,48 @@
+require 'spec_helper'
+
+describe Spree::AddressesHelper, type: :helper do
+  describe '#user_available_addresses' do
+    let!(:user) { create(:user) }
+
+    let!(:united_states) { create(:country, name: 'United States') }
+    let!(:poland)        { create(:country, name: 'Poland') }
+    let!(:china)         { create(:country, name: 'China') }
+    let!(:ukraine)       { create(:country, name: 'Ukraine') }
+
+    let!(:address_1) { create(:address, country_id: united_states.id, state_id: united_states.states.first, user: user) }
+    let!(:address_2) { create(:address, country_id: poland.id, state_id: poland.states.first, user: user) }
+    let!(:address_3) { create(:address, country_id: china.id, state_id: china.states.first, user: user) }
+
+    context 'when user is present' do
+      subject { user_available_addresses }
+
+      context 'when available countries do not includes user addresses countries' do
+        it 'returns an empty array' do
+          allow_any_instance_of(Spree::AddressesHelper).to receive(:try_spree_current_user).and_return(user)
+          allow_any_instance_of(Spree::AddressesHelper).to receive(:available_countries).and_return([ukraine])
+
+          expect(subject).to match_array []
+        end
+      end
+
+      context 'when available countries includes user addresses countries' do
+        it 'returns that addresses' do
+          allow_any_instance_of(Spree::AddressesHelper).to receive(:try_spree_current_user).and_return(user)
+          allow_any_instance_of(Spree::AddressesHelper).to receive(:available_countries).and_return([poland, united_states])
+
+          expect(subject).to match_array [address_1, address_2]
+        end
+      end
+    end
+
+    context 'when user is absent' do
+      subject { user_available_addresses }
+
+      it 'returns nil' do
+        allow_any_instance_of(Spree::AddressesHelper).to receive(:try_spree_current_user).and_return(nil)
+
+        expect(subject).to eq nil
+      end
+    end
+  end
+end