Stub configuration method in pages helper spec

Instead of globally including a module into the tet controller
we stub the one method the spec uses

spec/helpers/alchemy/pages_helper_spec.rb

@@ -8,10 +8,10 @@ module Alchemy
     let(:public_page) { create(:alchemy_page, :public) }
     let(:klingon) { create(:alchemy_language, :klingon) }
     let(:klingon_language_root) { create(:alchemy_page, :language_root, language: klingon) }
+    let(:prefix_locale?) { false }
 
     before do
-      ActionView::TestCase::TestController.include Alchemy::ConfigurationMethods
-      # helper.controller.class_eval { include Alchemy::ConfigurationMethods }
+      allow(helper).to receive(:prefix_locale?) { prefix_locale? }
       @root_page = language_root # We need this instance variable in the helpers
     end
 
@@ -34,9 +34,8 @@ module Alchemy
       context "when block is given" do
         it "passes it on to the render method" do
           expect(helper).to receive(:current_alchemy_site).and_return(default_site)
-          expect(helper)
-            .to receive(:render)
-            .with(default_site) { |&block| expect(block).to be }
+          expect(helper).to receive(:render)
+                              .with(default_site) { |&block| expect(block).to be }
 
           helper.render_site_layout { true }
         end
@@ -210,6 +209,8 @@ module Alchemy
           # Always create a language root page for klingon
           before { klingon_language_root }
 
+          let(:prefix_locale?) { true }
+
           it "should render two language links" do
             expect(helper.language_links).to have_selector("a", count: 2)
           end