drupalcampbristol/core/modules/simpletest/simpletest.routing.yml

simpletest.settings:
  path: '/admin/config/development/testing/settings'
  defaults:
    _form: 'Drupal\simpletest\Form\SimpletestSettingsForm'
    _title: 'Test settings'
  requirements:
    _permission: 'administer unit tests'

simpletest.test_form:
  path: '/admin/config/development/testing'
  defaults:
    _form: '\Drupal\simpletest\Form\SimpletestTestForm'
    _title: 'Testing'
  requirements:
    _permission: 'administer unit tests'

simpletest.result_form:
  path: '/admin/config/development/testing/results/{test_id}'
  defaults:
    _form: 'Drupal\simpletest\Form\SimpletestResultsForm'
    _title: 'Test result'
  requirements:
    _permission: 'administer unit tests'