Fix Lint/ConstantDefinitionInBlock cop (#24763)

spec/controllers/application_controller_spec.rb

@@ -223,14 +223,16 @@ describe ApplicationController, type: :controller do
   end
 
   describe 'cache_collection' do
-    class C < ApplicationController
-      public :cache_collection
+    subject do
+      Class.new(ApplicationController) do
+        public :cache_collection
+      end
     end
 
     shared_examples 'receives :with_includes' do |fabricator, klass|
       it 'uses raw if it is not an ActiveRecord::Relation' do
         record = Fabricate(fabricator)
-        expect(C.new.cache_collection([record], klass)).to eq [record]
+        expect(subject.new.cache_collection([record], klass)).to eq [record]
       end
     end
 
@@ -241,13 +243,13 @@ describe ApplicationController, type: :controller do
         record = Fabricate(fabricator)
         relation = klass.none
         allow(relation).to receive(:cache_ids).and_return([record])
-        expect(C.new.cache_collection(relation, klass)).to eq [record]
+        expect(subject.new.cache_collection(relation, klass)).to eq [record]
       end
     end
 
     it 'returns raw unless class responds to :with_includes' do
       raw = Object.new
-      expect(C.new.cache_collection(raw, Object)).to eq raw
+      expect(subject.new.cache_collection(raw, Object)).to eq raw
     end
 
     context 'Status' do