Convert more rubocop specs to fast_spec_helper

Replace Rails.root with manual directory as we don't require rails in
fast_spec_helper.

spec/rubocop/code_reuse_helpers_spec.rb

 # frozen_string_literal: true
 
-require 'spec_helper'
+require 'fast_spec_helper'
 require 'rubocop'
 require 'parser/current'
 require_relative '../../rubocop/code_reuse_helpers'
@@ -69,13 +69,13 @@ RSpec.describe RuboCop::CodeReuseHelpers do
 
   describe '#in_finder?' do
     it 'returns true for a node in the finders directory' do
-      node = parse_source('10', Rails.root.join('app', 'finders', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'finders', 'foo.rb'))
 
       expect(cop.in_finder?(node)).to eq(true)
     end
 
     it 'returns false for a node outside the finders directory' do
-      node = parse_source('10', Rails.root.join('app', 'foo', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'foo', 'foo.rb'))
 
       expect(cop.in_finder?(node)).to eq(false)
     end
@@ -83,13 +83,13 @@ RSpec.describe RuboCop::CodeReuseHelpers do
 
   describe '#in_model?' do
     it 'returns true for a node in the models directory' do
-      node = parse_source('10', Rails.root.join('app', 'models', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'models', 'foo.rb'))
 
       expect(cop.in_model?(node)).to eq(true)
     end
 
     it 'returns false for a node outside the models directory' do
-      node = parse_source('10', Rails.root.join('app', 'foo', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'foo', 'foo.rb'))
 
       expect(cop.in_model?(node)).to eq(false)
     end
@@ -97,13 +97,13 @@ RSpec.describe RuboCop::CodeReuseHelpers do
 
   describe '#in_service_class?' do
     it 'returns true for a node in the services directory' do
-      node = parse_source('10', Rails.root.join('app', 'services', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'services', 'foo.rb'))
 
       expect(cop.in_service_class?(node)).to eq(true)
     end
 
     it 'returns false for a node outside the services directory' do
-      node = parse_source('10', Rails.root.join('app', 'foo', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'foo', 'foo.rb'))
 
       expect(cop.in_service_class?(node)).to eq(false)
     end
@@ -111,13 +111,13 @@ RSpec.describe RuboCop::CodeReuseHelpers do
 
   describe '#in_presenter?' do
     it 'returns true for a node in the presenters directory' do
-      node = parse_source('10', Rails.root.join('app', 'presenters', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'presenters', 'foo.rb'))
 
       expect(cop.in_presenter?(node)).to eq(true)
     end
 
     it 'returns false for a node outside the presenters directory' do
-      node = parse_source('10', Rails.root.join('app', 'foo', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'foo', 'foo.rb'))
 
       expect(cop.in_presenter?(node)).to eq(false)
     end
@@ -125,13 +125,13 @@ RSpec.describe RuboCop::CodeReuseHelpers do
 
   describe '#in_serializer?' do
     it 'returns true for a node in the serializers directory' do
-      node = parse_source('10', Rails.root.join('app', 'serializers', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'serializers', 'foo.rb'))
 
       expect(cop.in_serializer?(node)).to eq(true)
     end
 
     it 'returns false for a node outside the serializers directory' do
-      node = parse_source('10', Rails.root.join('app', 'foo', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'foo', 'foo.rb'))
 
       expect(cop.in_serializer?(node)).to eq(false)
     end
@@ -139,13 +139,13 @@ RSpec.describe RuboCop::CodeReuseHelpers do
 
   describe '#in_worker?' do
     it 'returns true for a node in the workers directory' do
-      node = parse_source('10', Rails.root.join('app', 'workers', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'workers', 'foo.rb'))
 
       expect(cop.in_worker?(node)).to eq(true)
     end
 
     it 'returns false for a node outside the workers directory' do
-      node = parse_source('10', Rails.root.join('app', 'foo', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'foo', 'foo.rb'))
 
       expect(cop.in_worker?(node)).to eq(false)
     end
@@ -153,13 +153,13 @@ RSpec.describe RuboCop::CodeReuseHelpers do
 
   describe '#in_api?' do
     it 'returns true for a node in the API directory' do
-      node = parse_source('10', Rails.root.join('lib', 'api', 'foo.rb'))
+      node = parse_source('10', rails_root_join('lib', 'api', 'foo.rb'))
 
       expect(cop.in_api?(node)).to eq(true)
     end
 
     it 'returns false for a node outside the API directory' do
-      node = parse_source('10', Rails.root.join('lib', 'foo', 'foo.rb'))
+      node = parse_source('10', rails_root_join('lib', 'foo', 'foo.rb'))
 
       expect(cop.in_api?(node)).to eq(false)
     end
@@ -167,21 +167,21 @@ RSpec.describe RuboCop::CodeReuseHelpers do
 
   describe '#in_directory?' do
     it 'returns true for a directory in the CE app/ directory' do
-      node = parse_source('10', Rails.root.join('app', 'models', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'models', 'foo.rb'))
 
       expect(cop.in_directory?(node, 'models')).to eq(true)
     end
 
     it 'returns true for a directory in the EE app/ directory' do
       node =
-        parse_source('10', Rails.root.join('ee', 'app', 'models', 'foo.rb'))
+        parse_source('10', rails_root_join('ee', 'app', 'models', 'foo.rb'))
 
       expect(cop.in_directory?(node, 'models')).to eq(true)
     end
 
     it 'returns false for a directory in the lib/ directory' do
       node =
-        parse_source('10', Rails.root.join('lib', 'models', 'foo.rb'))
+        parse_source('10', rails_root_join('lib', 'models', 'foo.rb'))
 
       expect(cop.in_directory?(node, 'models')).to eq(false)
     end

spec/rubocop/cop/code_reuse/active_record_spec.rb

 # frozen_string_literal: true
 
-require 'spec_helper'
+require 'fast_spec_helper'
 require 'rubocop'
-require 'rubocop/rspec/support'
 require_relative '../../../../rubocop/cop/code_reuse/active_record'
 
-RSpec.describe RuboCop::Cop::CodeReuse::ActiveRecord do
+RSpec.describe RuboCop::Cop::CodeReuse::ActiveRecord, type: :rubocop do
   include CopHelper
 
   subject(:cop) { described_class.new }
@@ -46,7 +45,7 @@ RSpec.describe RuboCop::Cop::CodeReuse::ActiveRecord do
   end
 
   it 'does not flag the use of ActiveRecord models in a model' do
-    path = Rails.root.join('app', 'models', 'foo.rb').to_s
+    path = rails_root_join('app', 'models', 'foo.rb').to_s
 
     expect_no_offenses(<<~SOURCE, path)
     def foo
@@ -56,7 +55,7 @@ RSpec.describe RuboCop::Cop::CodeReuse::ActiveRecord do
   end
 
   it 'does not flag the use of ActiveRecord models in a spec' do
-    path = Rails.root.join('spec', 'foo_spec.rb').to_s
+    path = rails_root_join('spec', 'foo_spec.rb').to_s
 
     expect_no_offenses(<<~SOURCE, path)
     def foo
@@ -66,10 +65,7 @@ RSpec.describe RuboCop::Cop::CodeReuse::ActiveRecord do
   end
 
   it 'does not flag the use of ActiveRecord models in a background migration' do
-    path = Rails
-      .root
-      .join('lib', 'gitlab', 'background_migration', 'foo.rb')
-      .to_s
+    path = rails_root_join('lib', 'gitlab', 'background_migration', 'foo.rb').to_s
 
     expect_no_offenses(<<~SOURCE, path)
     def foo
@@ -79,7 +75,7 @@ RSpec.describe RuboCop::Cop::CodeReuse::ActiveRecord do
   end
 
   it 'does not flag the use of ActiveRecord models in lib/gitlab/database' do
-    path = Rails.root.join('lib', 'gitlab', 'database', 'foo.rb').to_s
+    path = rails_root_join('lib', 'gitlab', 'database', 'foo.rb').to_s
 
     expect_no_offenses(<<~SOURCE, path)
     def foo

spec/rubocop/qa_helpers_spec.rb

 # frozen_string_literal: true
 
-require 'spec_helper'
+require 'fast_spec_helper'
 require 'rubocop'
+require 'parser/current'
 require_relative '../../rubocop/qa_helpers'
 
-RSpec.describe RuboCop::QAHelpers do
+RSpec.describe RuboCop::QAHelpers, type: :rubocop do
   def parse_source(source, path = 'foo.rb')
     buffer = Parser::Source::Buffer.new(path)
     buffer.source = source
@@ -23,13 +24,13 @@ RSpec.describe RuboCop::QAHelpers do
 
   describe '#in_qa_file?' do
     it 'returns true for a node in the qa/ directory' do
-      node = parse_source('10', Rails.root.join('qa', 'qa', 'page', 'dashboard', 'groups.rb'))
+      node = parse_source('10', rails_root_join('qa', 'qa', 'page', 'dashboard', 'groups.rb'))
 
       expect(cop.in_qa_file?(node)).to eq(true)
     end
 
     it 'returns false for a node outside the qa/ directory' do
-      node = parse_source('10', Rails.root.join('app', 'foo', 'foo.rb'))
+      node = parse_source('10', rails_root_join('app', 'foo', 'foo.rb'))
 
       expect(cop.in_qa_file?(node)).to eq(false)
     end

spec/support/helpers/fast_rails_root.rb

+# frozen_string_literal: true
+
+# For specs which don't load Rails, provide a path to Rails root
+module FastRailsRoot
+  RAILS_ROOT = File.absolute_path("#{__dir__}/../../..")
+
+  def rails_root_join(*args)
+    File.join(RAILS_ROOT, *args)
+  end
+end

spec/support/rspec.rb

@@ -4,6 +4,7 @@ require_relative "helpers/stub_configuration"
 require_relative "helpers/stub_metrics"
 require_relative "helpers/stub_object_storage"
 require_relative "helpers/stub_env"
+require_relative "helpers/fast_rails_root"
 require 'rubocop/rspec/support'
 
 RSpec.configure do |config|
@@ -14,6 +15,7 @@ RSpec.configure do |config|
   config.include StubMetrics
   config.include StubObjectStorage
   config.include StubENV
+  config.include FastRailsRoot
 
   config.include RuboCop::RSpec::ExpectOffense, type: :rubocop
 end