Fix leaky constant in json serialization spec

.rubocop.yml

@@ -380,7 +380,6 @@ RSpec/LeakyConstantDeclaration:
     - 'spec/migrations/encrypt_plaintext_attributes_on_application_settings_spec.rb'
     - 'spec/models/clusters/cluster_spec.rb'
     - 'spec/models/concerns/batch_destroy_dependent_associations_spec.rb'
-    - 'spec/models/concerns/blocks_json_serialization_spec.rb'
     - 'spec/models/concerns/bulk_insert_safe_spec.rb'
     - 'spec/models/concerns/bulk_insertable_associations_spec.rb'
     - 'spec/models/concerns/mentionable_spec.rb'

changelogs/unreleased/leaky-constant-fix-18.yml

+---
+title: Fix leaky constant issue in json serialization spec
+merge_request: 32051
+author: Rajendra Kadam
+type: fixed

spec/models/concerns/blocks_json_serialization_spec.rb

@@ -3,8 +3,11 @@
 require 'spec_helper'
 
 describe BlocksJsonSerialization do
-  DummyModel = Class.new do
-    include BlocksJsonSerialization
+  before do
+    stub_const('DummyModel', Class.new)
+    DummyModel.class_eval do
+      include BlocksJsonSerialization
+    end
   end
 
   it 'blocks as_json' do