Fix leaky constant in migration helpers and ignored cols spec

.rubocop.yml

@@ -351,9 +351,6 @@ RSpec/LeakyConstantDeclaration:
     - 'spec/db/schema_spec.rb'
     - 'spec/lib/feature_spec.rb'
     - 'spec/lib/gitlab/config/entry/simplifiable_spec.rb'
-    - 'spec/lib/gitlab/database/migration_helpers_spec.rb'
-    - 'spec/lib/gitlab/database/obsolete_ignored_columns_spec.rb'
-    - 'spec/lib/gitlab/database/with_lock_retries_spec.rb'
     - 'spec/lib/gitlab/git/diff_collection_spec.rb'
     - 'spec/lib/gitlab/import_export/import_test_coverage_spec.rb'
     - 'spec/lib/gitlab/import_export/project/relation_factory_spec.rb'

changelogs/unreleased/leaky-constant-fix-37.yml

+---
+title: Fix leaky constant issue in migration helpers, with lock retries and ignored cols spec
+merge_request: 32170
+author: Rajendra Kadam
+type: fixed

spec/lib/gitlab/database/obsolete_ignored_columns_spec.rb

@@ -3,14 +3,22 @@
 require 'spec_helper'
 
 describe Gitlab::Database::ObsoleteIgnoredColumns do
-  module Testing
+  before do
+    stub_const('Testing', Module.new)
+    stub_const('Testing::MyBase', Class.new(ActiveRecord::Base))
+    stub_const('SomeAbstract', Class.new(Testing::MyBase))
+    stub_const('Testing::B', Class.new(Testing::MyBase))
+    stub_const('Testing::A', Class.new(SomeAbstract))
+    stub_const('Testing::C', Class.new(Testing::MyBase))
+
     # Used a fixed date to prevent tests failing across date boundaries
-    REMOVE_DATE = Date.new(2019, 12, 16)
+    stub_const('REMOVE_DATE', Date.new(2019, 12, 16))
 
-    class MyBase < ApplicationRecord
+    Testing.module_eval do
+      Testing::MyBase.class_eval do
       end
 
-    class SomeAbstract < MyBase
+      SomeAbstract.class_eval do
         include IgnorableColumns
 
         self.abstract_class = true
@@ -20,7 +28,7 @@ describe Gitlab::Database::ObsoleteIgnoredColumns do
         ignore_column :unused, remove_after: '2019-01-01', remove_with: '12.0'
       end
 
-    class B < MyBase
+      Testing::B.class_eval do
         include IgnorableColumns
 
         self.table_name = 'issues'
@@ -29,21 +37,22 @@ describe Gitlab::Database::ObsoleteIgnoredColumns do
         ignore_column :not_used_but_still_ignored, remove_after: REMOVE_DATE.to_s, remove_with: '12.1'
       end
 
-    class A < SomeAbstract
+      Testing::A.class_eval do
         ignore_column :also_unused, remove_after: '2019-02-01', remove_with: '12.1'
         ignore_column :not_used_but_still_ignored, remove_after: REMOVE_DATE.to_s, remove_with: '12.1'
       end
 
-    class C < MyBase
+      Testing::C.class_eval do
         self.table_name = 'users'
       end
     end
+  end
 
   subject { described_class.new(Testing::MyBase) }
 
   describe '#execute' do
     it 'returns a list of class names and columns pairs' do
-      Timecop.freeze(Testing::REMOVE_DATE) do
+      Timecop.freeze(REMOVE_DATE) do
         expect(subject.execute).to eq([
           ['Testing::A', {
             'unused' => IgnorableColumns::ColumnIgnore.new(Date.parse('2019-01-01'), '12.0'),

spec/lib/gitlab/database/with_lock_retries_spec.rb

@@ -35,9 +35,6 @@ describe Gitlab::Database::WithLockRetries do
     end
 
     context 'when lock retry is enabled' do
-      class ActiveRecordSecond < ActiveRecord::Base
-      end
-
       let(:lock_fiber) do
         Fiber.new do
           # Initiating a second DB connection for the lock
@@ -52,6 +49,8 @@ describe Gitlab::Database::WithLockRetries do
       end
 
       before do
+        stub_const('ActiveRecordSecond', Class.new(ActiveRecord::Base))
+
         lock_fiber.resume # start the transaction and lock the table
       end