--- /dev/null
+<?php
+
+namespace Drupal\Tests\system\Unit\Routing;
+
+use Drupal\Core\Routing\RouteBuildEvent;
+use Drupal\system\EventSubscriber\AdminRouteSubscriber;
+use Drupal\Tests\UnitTestCase;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * @coversDefaultClass \Drupal\system\EventSubscriber\AdminRouteSubscriber
+ * @group system
+ */
+class AdminRouteSubscriberTest extends UnitTestCase {
+
+ /**
+ * @covers ::alterRoutes
+ * @covers ::isHtmlRoute
+ *
+ * @dataProvider providerTestAlterRoutes
+ */
+ public function testAlterRoutes(Route $route, $is_admin) {
+ $collection = new RouteCollection();
+ $collection->add('the_route', $route);
+ (new AdminRouteSubscriber())->onAlterRoutes(new RouteBuildEvent($collection));
+
+ $this->assertSame($is_admin, $route->getOption('_admin_route'));
+ }
+
+ public function providerTestAlterRoutes() {
+ $data = [];
+ $data['non-admin'] = [
+ new Route('/foo'),
+ NULL,
+ ];
+ $data['admin prefix'] = [
+ new Route('/admin/foo'),
+ TRUE,
+ ];
+ $data['admin option'] = [
+ (new Route('/foo'))
+ ->setOption('_admin_route', TRUE),
+ TRUE,
+ ];
+ $data['admin prefix, non-HTML format'] = [
+ (new Route('/admin/foo'))
+ ->setRequirement('_format', 'json'),
+ NULL,
+ ];
+ $data['admin option, non-HTML format'] = [
+ (new Route('/foo'))
+ ->setRequirement('_format', 'json')
+ ->setOption('_admin_route', TRUE),
+ TRUE,
+ ];
+ $data['admin prefix, HTML format'] = [
+ (new Route('/admin/foo'))
+ ->setRequirement('_format', 'html'),
+ TRUE,
+ ];
+ $data['admin prefix, multi-format including HTML'] = [
+ (new Route('/admin/foo'))
+ ->setRequirement('_format', 'json|html'),
+ TRUE,
+ ];
+ return $data;
+ }
+
+}