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setDefaultLocale example

public function __construct(RequestStack $requestStack, string $defaultLocale = 'en', RequestContextAwareInterface $router = null, bool $useAcceptLanguageHeader = false, array $enabledLocales = [])
    {
        $this->defaultLocale = $defaultLocale;
        $this->requestStack = $requestStack;
        $this->router = $router;
        $this->useAcceptLanguageHeader = $useAcceptLanguageHeader;
        $this->enabledLocales = $enabledLocales;
    }

    public function setDefaultLocale(KernelEvent $event): void
    {
        $event->getRequest()->setDefaultLocale($this->defaultLocale);
    }

    public function onKernelRequest(RequestEvent $event): void
    {
        $request = $event->getRequest();

        $this->setLocale($request);
        $this->setRouterContext($request);
    }

    public function onKernelFinishRequest(FinishRequestEvent $event): void
    {

$request = new Request([], [], [], [], [], $server);
        $this->assertEquals('json', $request->getContentTypeFormat());

        $server = ['HTTP_CONTENT_TYPE' => 'text/html'];
        $request = new Request([], [], [], [], [], $server);
        $this->assertEquals('html', $request->getContentTypeFormat());
    }

    public function testSetDefaultLocale()
    {
        $request = new Request();
        $request->setDefaultLocale('pl');
        $locale = $request->getLocale();

        $this->assertEquals('pl', $locale);
    }

    public function testCreate()
    {
        $request = Request::create('http://test.com/foo?bar=baz');
        $this->assertEquals('http://test.com/foo?bar=baz', $request->getUri());
        $this->assertEquals('/foo', $request->getPathInfo());
        $this->assertEquals('bar=baz', $request->getQueryString());

KernelEvents::FINISH_REQUEST => [['onKernelFinishRequest', 0]],
            ],
            LocaleListener::getSubscribedEvents()
        );
    }

    public function testDefaultLocale()
    {
        $listener = new LocaleListener($this->requestStack, 'fr');
        $event = $this->getEvent($request = Request::create('/'));

        $listener->setDefaultLocale($event);
        $this->assertEquals('fr', $request->getLocale());
    }

    public function testLocaleFromRequestAttribute()
    {
        $request = Request::create('/');
        $request->cookies->set(session_name(), 'value');

        $request->attributes->set('_locale', 'es');
        $listener = new LocaleListener($this->requestStack, 'fr');
        $event = $this->getEvent($request);