Merge branch 'pl-rubocop-leaky-constant-declaration' into 'master'

Use `stub_const` to avoid disabling cop RSpec/LeakyConstantDeclaration

See merge request gitlab-org/gitlab!54847

spec/lib/gitlab/database/bulk_update_spec.rb

@@ -51,7 +51,7 @@ RSpec.describe Gitlab::Database::BulkUpdate do
 
   it 'is possible to update all objects in a single query' do
     users = create_list(:user, 3)
-    mapping = users.zip(%w(foo bar baz)).to_h do |u, name|
+    mapping = users.zip(%w[foo bar baz]).to_h do |u, name|
       [u, { username: name, admin: true }]
     end
 
@@ -61,13 +61,13 @@ RSpec.describe Gitlab::Database::BulkUpdate do
 
     # We have optimistically updated the values
     expect(users).to all(be_admin)
-    expect(users.map(&:username)).to eq(%w(foo bar baz))
+    expect(users.map(&:username)).to eq(%w[foo bar baz])
 
     users.each(&:reset)
 
     # The values are correct on reset
     expect(users).to all(be_admin)
-    expect(users.map(&:username)).to eq(%w(foo bar baz))
+    expect(users.map(&:username)).to eq(%w[foo bar baz])
   end
 
   it 'is possible to update heterogeneous sets' do
@@ -113,23 +113,19 @@ RSpec.describe Gitlab::Database::BulkUpdate do
   include_examples 'basic functionality'
 
   context 'when prepared statements are configured differently to the normal test environment' do
-    # rubocop: disable RSpec/LeakyConstantDeclaration
-    # This cop is disabled because you cannot call establish_connection on
-    # an anonymous class.
-    class ActiveRecordBasePreparedStatementsInverted < ActiveRecord::Base
+    before do
+      klass = Class.new(ActiveRecord::Base) do
         def self.abstract_class?
           true # So it gets its own connection
         end
       end
-    # rubocop: enable RSpec/LeakyConstantDeclaration
 
-    before_all do
+      stub_const('ActiveRecordBasePreparedStatementsInverted', klass)
+
       c = ActiveRecord::Base.connection.instance_variable_get(:@config)
       inverted = c.merge(prepared_statements: !ActiveRecord::Base.connection.prepared_statements)
       ActiveRecordBasePreparedStatementsInverted.establish_connection(inverted)
-    end
 
-    before do
       allow(ActiveRecord::Base).to receive(:connection_specification_name)
         .and_return(ActiveRecordBasePreparedStatementsInverted.connection_specification_name)
     end