Add new RailsHelpers module for specs

spec/support/helpers/rails_helpers.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module RailsHelpers
+  def stub_rails_env(env_name)
+    allow(Rails).to receive(:env).and_return(ActiveSupport::StringInquirer.new(env_name))
+  end
+end