Fix leaky constant in system check spec

.rubocop.yml

@@ -379,7 +379,6 @@ RSpec/LeakyConstantDeclaration:
     - 'spec/lib/marginalia_spec.rb'
     - 'spec/lib/omni_auth/strategies/jwt_spec.rb'
     - 'spec/lib/system_check/simple_executor_spec.rb'
-    - 'spec/lib/system_check_spec.rb'
     - 'spec/mailers/notify_spec.rb'
     - 'spec/migrations/20191125114345_add_admin_mode_protected_path_spec.rb'
     - 'spec/migrations/encrypt_plaintext_attributes_on_application_settings_spec.rb'

changelogs/unreleased/leaky-constant-fix-23.yml

+---
+title: Fix leaky constant issue in system check spec
+merge_request: 32080
+author: Rajendra Kadam
+type: fixed

spec/lib/system_check_spec.rb

@@ -4,19 +4,22 @@ require 'spec_helper'
 require 'rake_helper'
 
 describe SystemCheck do
-  class SimpleCheck < SystemCheck::BaseCheck
+  before do
+    stub_const('SimpleCheck', Class.new(SystemCheck::BaseCheck))
+    stub_const('OtherCheck', Class.new(SystemCheck::BaseCheck))
+
+    SimpleCheck.class_eval do
       def check?
         true
       end
     end
 
-  class OtherCheck < SystemCheck::BaseCheck
+    OtherCheck.class_eval do
       def check?
         false
       end
     end
 
-  before do
     silence_output
   end