Stub class in tree spec

.rubocop.yml

@@ -387,7 +387,6 @@ RSpec/LeakyConstantDeclaration:
     - 'spec/models/concerns/reactive_caching_spec.rb'
     - 'spec/models/concerns/triggerable_hooks_spec.rb'
     - 'spec/models/repository_spec.rb'
-    - 'spec/models/tree_spec.rb'
     - 'spec/policies/merge_request_policy_spec.rb'
     - 'spec/requests/api/graphql/tasks/task_completion_status_spec.rb'
     - 'spec/requests/api/statistics_spec.rb'

changelogs/unreleased/leaky-constant-fix-16.yml

+---
+title: Fix leaky constant issue in tree spec
+merge_request: 32045
+author: Rajendra Kadam
+type: fixed

spec/models/tree_spec.rb

@@ -9,15 +9,18 @@ describe Tree do
   subject { described_class.new(repository, '54fcc214') }
 
   describe '#readme' do
-    class FakeBlob
-      attr_reader :name
-
-      def initialize(name)
-        @name = name
-      end
-
-      def readme?
-        name =~ /^readme/i
+    before do
+      stub_const('FakeBlob', Class.new)
+      FakeBlob.class_eval do
+        attr_reader :name
+
+        def initialize(name)
+          @name = name
+        end
+
+        def readme?
+          name =~ /^readme/i
+        end
       end
     end