Merge branch 'rs-described_class-cop-2' into 'master'

.rubocop.yml

doc/development/testing.md

spec/controllers/application_controller_spec.rb

spec/finders/issues_finder_spec.rb

spec/finders/merge_requests_finder_spec.rb

spec/finders/snippets_finder_spec.rb

spec/lib/banzai/renderer_spec.rb

spec/lib/gitlab/changes_list_spec.rb

spec/lib/gitlab/ci/build/credentials/factory_spec.rb

spec/lib/gitlab/ci/build/credentials/registry_spec.rb

spec/lib/gitlab/current_settings_spec.rb

spec/lib/gitlab/cycle_analytics/base_event_fetcher_spec.rb

spec/lib/gitlab/git/util_spec.rb

spec/lib/gitlab/gitaly_client/ref_spec.rb

spec/lib/gitlab/ldap/person_spec.rb

spec/lib/gitlab/metrics_spec.rb

spec/lib/gitlab/sidekiq_throttler_spec.rb

spec/lib/gitlab/slash_commands/dsl_spec.rb

spec/lib/gitlab/template/gitignore_template_spec.rb

spec/lib/gitlab/template/gitlab_ci_yml_template_spec.rb