Add multitenancy with apartment

Co-Authored-By: Javi Martín <javim@elretirao.net>

spec/rails_helper.rb

@@ -65,3 +65,14 @@ Capybara.enable_aria_label = true
 Capybara.disable_animation = true
 
 OmniAuth.config.test_mode = true
+
+def with_subdomain(subdomain, &block)
+  app_host = Capybara.app_host
+
+  begin
+    Capybara.app_host = "http://#{subdomain}.lvh.me"
+    block.call
+  ensure
+    Capybara.app_host = app_host
+  end
+end