Stub class in content whitelist spec

.rubocop.yml

@@ -409,7 +409,6 @@ RSpec/LeakyConstantDeclaration:
     - 'spec/support/shared_examples/quick_actions/issuable/issuable_quick_actions_shared_examples.rb'
     - 'spec/support_specs/helpers/active_record/query_recorder_spec.rb'
     - 'spec/support_specs/matchers/exceed_query_limit_helpers_spec.rb'
-    - 'spec/uploaders/content_type_whitelist_spec.rb'
     - 'spec/uploaders/records_uploads_spec.rb'
 
 RSpec/EmptyLineAfterHook:

changelogs/unreleased/leaky-constant-fix-2.yml

+---
+title: Add class stubs and fix leaky constant alert in content whitelist spec
+merge_request: 31946
+author: Rajendra Kadam
+type: fixed

spec/uploaders/content_type_whitelist_spec.rb

@@ -3,16 +3,20 @@
 require 'spec_helper'
 
 describe ContentTypeWhitelist do
-  class DummyUploader < CarrierWave::Uploader::Base
-    include ContentTypeWhitelist::Concern
+  let_it_be(:model) { build_stubbed(:user) }
+  let!(:uploader) do
+    stub_const('DummyUploader', Class.new(CarrierWave::Uploader::Base))
+
+    DummyUploader.class_eval do
+      include ContentTypeWhitelist::Concern
 
-    def content_type_whitelist
-      %w[image/png image/jpeg]
+      def content_type_whitelist
+        %w[image/png image/jpeg]
+      end
     end
-  end
 
-  let_it_be(:model) { build_stubbed(:user) }
-  let_it_be(:uploader) { DummyUploader.new(model, :dummy) }
+    DummyUploader.new(model, :dummy)
+  end
 
   context 'upload whitelisted file content type' do
     let(:path) { File.join('spec', 'fixtures', 'rails_sample.jpg') }