Add receive stub for wiki specs

.rubocop.yml

@@ -412,7 +412,6 @@ RSpec/RepeatedExample:
     - 'spec/models/concerns/issuable_spec.rb'
     - 'spec/models/member_spec.rb'
     - 'spec/models/project_services/chat_message/pipeline_message_spec.rb'
-    - 'spec/models/wiki_page_spec.rb'
     - 'spec/routing/admin_routing_spec.rb'
     - 'spec/rubocop/cop/migration/update_large_table_spec.rb'
     - 'spec/services/notification_service_spec.rb'

changelogs/unreleased/refator-wiki-page.yml

+---
+title: Refactor duplicate specs in wiki page specs
+merge_request: 28551
+author: Rajendra Kadam
+type: added

spec/models/wiki_page_spec.rb

@@ -577,6 +577,8 @@ describe WikiPage do
     end
 
     it 'returns false when version is nil' do
+      expect(latest_page).to receive(:version) { nil }
+
       expect(latest_page.historical?).to be_falsy
     end