Fix rubocop loading order issues

- due to our loading order during test, we are loading
  the cop_helper first instead of letting the rubocop
  be required first and the class to be defined.

spec/support/helpers/cop_helper.rb

-# frozen_string_literal: true
-
-require 'tempfile'
-
-# This module provides methods that make it easier to test Cops.
-module CopHelper
-  extend RSpec::SharedContext
-
-  let(:ruby_version) { 2.4 }
-  let(:rails_version) { false }
-
-  def inspect_source_file(source)
-    Tempfile.open('tmp') { |f| inspect_source(source, f) }
-  end
-
-  def inspect_source(source, file = nil)
-    RuboCop::Formatter::DisabledConfigFormatter.config_to_allow_offenses = {}
-    RuboCop::Formatter::DisabledConfigFormatter.detected_styles = {}
-    processed_source = parse_source(source, file)
-    raise 'Error parsing example code' unless processed_source.valid_syntax?
-
-    _investigate(cop, processed_source)
-  end
-
-  def parse_source(source, file = nil)
-    if file&.respond_to?(:write)
-      file.write(source)
-      file.rewind
-      file = file.path
-    end
-
-    RuboCop::ProcessedSource.new(source, ruby_version, file)
-  end
-
-  def autocorrect_source_file(source)
-    Tempfile.open('tmp') { |f| autocorrect_source(source, f) }
-  end
-
-  def autocorrect_source(source, file = nil)
-    RuboCop::Formatter::DisabledConfigFormatter.config_to_allow_offenses = {}
-    RuboCop::Formatter::DisabledConfigFormatter.detected_styles = {}
-    cop.instance_variable_get(:@options)[:auto_correct] = true
-    processed_source = parse_source(source, file)
-    _investigate(cop, processed_source)
-
-    @last_corrector.rewrite
-  end
-
-  def _investigate(cop, processed_source)
-    team = RuboCop::Cop::Team.new([cop], nil, raise_error: true)
-    report = team.investigate(processed_source)
-    @last_corrector = report.correctors.first || RuboCop::Cop::Corrector.new(processed_source)
-    report.offenses
-  end
-end
-
-module RuboCop
-  module Cop
-    # Monkey-patch Cop for tests to provide easy access to messages and
-    # highlights.
-    # this file is an exact copy of source except for this line
-    # where we change to the new Base class defined in rubocop and skirt around our superclass mismatch for class Cop
-    # when running a rubocop spec.
-    class Base
-      def messages
-        offenses.sort.map(&:message)
-      end
-
-      def highlights
-        offenses.sort.map { |o| o.location.source }
-      end
-    end
-  end
-end

spec/support/rspec.rb

@@ -6,7 +6,13 @@ require_relative "helpers/stub_object_storage"
 require_relative "helpers/stub_env"
 require_relative "helpers/fast_rails_root"
 
-require_relative 'rubocop_patch'
+# so we need to load rubocop here due to the rubocop support file loading cop_helper
+# which monkey patches class Cop
+# if cop helper is loaded before rubocop (where class Cop is defined as class Cop < Base)
+# we get a `superclass mismatch for class Cop` error when running a rspec for a locally defined
+# rubocop cop - therefore we need rubocop required first since it had an inheritance added to the Cop class
+require 'rubocop'
+require 'rubocop/rspec/support'
 
 RSpec.configure do |config|
   config.mock_with :rspec

spec/support/rubocop_patch.rb

-# frozen_string_literal: true
-
-# There is an issue between rubocop versions 0.86 and 0.87 (verified by testing locally)
-# where the monkey patching in cop_helper is referencing class Cop and should really be referencing class Base instead
-# the gem's version of the cop_helper causes this issue when testing a rubocop cop locally and in CI
-# The only difference in this file as compared to gem source file is that we include our own cop_helper instead
-# which is a direct copy with a fix for the monkey patching part.
-# Doing this, resolves the issue.
-# Ideally we should move away from using the cop_helper at all as is the direction of rubocop as seen
-# here - https://github.com/rubocop-hq/rubocop/issues/8003
-# more info https://gitlab.com/gitlab-org/gitlab/-/merge_requests/46477
-
-require_relative 'helpers/cop_helper'
-require 'rubocop/rspec/host_environment_simulation_helper'
-require 'rubocop/rspec/shared_contexts'
-require 'rubocop/rspec/expect_offense'
-
-RSpec.configure do |config|
-  config.include CopHelper
-  config.include HostEnvironmentSimulatorHelper
-end