test_page_test.routing.yml

test_page_test.test_page:
  path: '/test-page'
  defaults:
    _title: 'Test front page'
    _controller: '\Drupal\test_page_test\Controller\TestPageTestController::testPage'
  requirements:
    _access: 'TRUE'

test_page_test.render_title:
  path: '/test-render-title'
  defaults:
    _controller: '\Drupal\test_page_test\Controller\Test::renderTitle'
  requirements:
    _access: 'TRUE'

test_page_test.static_title:
  path: '/test-page-static-title'
  defaults:
    _controller: '\Drupal\test_page_test\Controller\Test::staticTitle'
    _title: 'Static title'
  requirements:
    _access: 'TRUE'

test_page_test.cached_controller:
  path: '/test-page-cached-controller'
  defaults:
    _controller: '\Drupal\test_page_test\Controller\Test::controllerWithCache'
  requirements:
    _access: 'TRUE'

test_page_test.dynamic_title:
  path: '/test-page-dynamic-title'
  defaults:
    _controller: '\Drupal\test_page_test\Controller\Test::staticTitle'
    _title_callback: 'Drupal\test_page_test\Controller\Test::dynamicTitle'
  requirements:
    _access: 'TRUE'

test_page_test.admin_render_title:
  path: '/admin/test-render-title'
  defaults:
    _controller: '\Drupal\test_page_test\Controller\Test::renderTitle'
  requirements:
    _access: 'TRUE'