LocaleListener example

class LocaleListenerTest extends TestCase
{
    private MockObject&RequestStack $requestStack;

    protected function setUp(): void
    {
        $this->requestStack = $this->createMock(RequestStack::class);
    }

    public function testIsAnEventSubscriber()
    {
        $this->assertInstanceOf(EventSubscriberInterface::class, new LocaleListener($this->requestStack));
    }

    public function testRegisteredEvent()
    {
        $this->assertEquals(
            [
                KernelEvents::REQUEST => [['setDefaultLocale', 100], ['onKernelRequest', 16]],
                KernelEvents::FINISH_REQUEST => [['onKernelFinishRequest', 0]],
            ],
            LocaleListener::getSubscribedEvents()
        );
    }