How to handle routing with locale in Symfony 4.3 KernelTestCase? - php

Question

I need to test (PHPUnit) a service in Symfony 4.3 application and that service depends on the framework. It uses Translator and Router and it also depends on User. This means I want to write a KernelTestCase with User (done). The problem is the Router fails because the Routes need _locale. How can I address the issue?
1) App\Tests\blahblah\MenuFactoryTest::testMenuItemsByRoles with data set "ROLE_ADMIN" (array('ROLE_ADMIN'), array(array('Menu Label 1', 'Menu Label 2')))
Symfony\Component\Routing\Exception\MissingMandatoryParametersException: Some mandatory parameters are missing ("_locale") to generate a URL for route "default_dashboard".
class MenuFactoryTest extends KernelTestCase
{
use LogUserTrait; // my trait allowing to emulate a user with particular roles
/** #var MenuFactory */
private $menuFactory;
protected function setUp(): void
{
static::bootKernel();
$this->menuFactory = static::$container->get(MenuFactory::class);
}
// ...
/**
* #param array $roles
* #param array $menuLabels
*
* #dataProvider provideMenuItemsByRoles
*/
public function testMenuItemsByRoles(array $roles, array $menuLabels): void
{
$this->logIn($roles);
$this->assertMenuItemsHaveLabels(
$menuLabels,
$this->menuFactory->getMenuItems()
);
}
// ...
}
class MenuFactory implements MenuFactoryInterface
{
/** #var RouterInterface */
private $router;
/** #var AuthorizationCheckerInterface */
private $securityChecker;
/** #var TranslatorInterface */
private $translator;
public function __construct(
RouterInterface $router,
AuthorizationCheckerInterface $securityChecker,
TranslatorInterface $translator
) {
$this->router = $router;
$this->securityChecker = $securityChecker;
$this->translator = $translator;
}
public function getMenuItems(string $appMenuName = null): array
{
$menuItems = [];
$dashboardMenu = new DefaultMenuItem(
$this->translator->trans('menu.dashboard'),
$this->router->generate('default_dashboard'),
'fa fa-dashboard'
);
$menuItems[] = $dashboardMenu;
// ...
return $menuItems;
}
}