Fix RSpec/StubbedMock cop (#25552)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

spec/helpers/application_helper_spec.rb

@@ -77,19 +77,17 @@ describe ApplicationHelper do
 
   describe 'open_registrations?' do
     it 'returns true when open for registrations' do
-      without_partial_double_verification do
-        expect(Setting).to receive(:registrations_mode).and_return('open')
-      end
+      allow(Setting).to receive(:[]).with('registrations_mode').and_return('open')
 
       expect(helper.open_registrations?).to be true
+      expect(Setting).to have_received(:[]).with('registrations_mode')
     end
 
     it 'returns false when closed for registrations' do
-      without_partial_double_verification do
-        expect(Setting).to receive(:registrations_mode).and_return('none')
-      end
+      allow(Setting).to receive(:[]).with('registrations_mode').and_return('none')
 
       expect(helper.open_registrations?).to be false
+      expect(Setting).to have_received(:[]).with('registrations_mode')
     end
   end
 
@@ -296,8 +294,9 @@ describe ApplicationHelper do
 
     it 'returns site title on production environment' do
       Setting.site_title = 'site title'
-      expect(Rails.env).to receive(:production?).and_return(true)
+      allow(Rails.env).to receive(:production?).and_return(true)
       expect(helper.title).to eq 'site title'
+      expect(Rails.env).to have_received(:production?)
     end
   end
 end