Remove incomplete and duplicate spec from changelog specs

.rubocop.yml

@@ -398,7 +398,6 @@ RSpec/RepeatedExample:
     - 'spec/graphql/gitlab_schema_spec.rb'
     - 'spec/helpers/users_helper_spec.rb'
     - 'spec/lib/gitlab/closing_issue_extractor_spec.rb'
-    - 'spec/lib/gitlab/danger/changelog_spec.rb'
     - 'spec/lib/gitlab/import_export/project/relation_factory_spec.rb'
     - 'spec/routing/admin_routing_spec.rb'
     - 'spec/rubocop/cop/migration/update_large_table_spec.rb'

changelogs/unreleased/changelog-spec.yml

+---
+title: Remove duplicate spec from changelog spec
+merge_request: 28801
+author: Rajendra Kadam
+type: added

spec/lib/gitlab/danger/changelog_spec.rb

@@ -28,18 +28,6 @@ describe Gitlab::Danger::Changelog do
   describe '#needed?' do
     subject { changelog.needed? }
 
-    [
-      { docs: nil },
-      { none: nil },
-      { docs: nil, none: nil }
-    ].each do |categories|
-      let(:changes_by_category) { categories }
-
-      it "is falsy when categories don't require a changelog" do
-        is_expected.to be_falsy
-      end
-    end
-
     where(:categories, :labels) do
       { backend: nil }                             | %w[backend backstage]
       { frontend: nil, docs: nil }                 | ['ci-build']
@@ -50,7 +38,7 @@ describe Gitlab::Danger::Changelog do
       let(:changes_by_category) { categories }
       let(:mr_labels) { labels }
 
-      it "is falsy when labels require no changelog" do
+      it "is falsy when categories and labels require no changelog" do
         is_expected.to be_falsy
       end
     end