--- /dev/null
+<?php
+
+namespace Drupal\KernelTests\Core\Extension;
+
+use Drupal\Core\Database\Database;
+use Drupal\KernelTests\KernelTestBase;
+use Symfony\Component\Routing\Exception\RouteNotFoundException;
+
+/**
+ * Tests the ModuleInstaller class.
+ *
+ * @coversDefaultClass \Drupal\Core\Extension\ModuleInstaller
+ *
+ * @group Extension
+ */
+class ModuleInstallerTest extends KernelTestBase {
+
+ /**
+ * Modules to install.
+ *
+ * The System module is required because system_rebuild_module_data() is used.
+ *
+ * @var array
+ */
+ public static $modules = ['system'];
+
+ /**
+ * Tests that routes are rebuilt during install and uninstall of modules.
+ *
+ * @covers ::install
+ * @covers ::uninstall
+ */
+ public function testRouteRebuild() {
+ // Remove the routing table manually to ensure it can be created lazily
+ // properly.
+ Database::getConnection()->schema()->dropTable('router');
+
+ $this->container->get('module_installer')->install(['router_test']);
+ $route = $this->container->get('router.route_provider')->getRouteByName('router_test.1');
+ $this->assertEquals('/router_test/test1', $route->getPath());
+
+ $this->container->get('module_installer')->uninstall(['router_test']);
+ $this->setExpectedException(RouteNotFoundException::class);
+ $this->container->get('router.route_provider')->getRouteByName('router_test.1');
+ }
+
+}