getNonSystemLanguageId example

static::assertSame(Response::HTTP_NO_CONTENT, $this->getBrowser()->getResponse()->getStatusCode(), (string) $this->getBrowser()->getResponse()->getContent());
        static::assertNotEmpty($response->headers->get('Location'));
        static::assertEquals('http://localhost/api/country/' . $id, $response->headers->get('Location'));

        $browser = $this->getBrowser();
        $connection = $this->getBrowser()->getContainer()->get(Connection::class);
        $user = TestUser::createNewTestUser($connection, ['country:update', 'country:read']);

        $user->authorizeBrowser($browser);

        $data = ['name' => 'not in system language'];
        $languageId = $this->getNonSystemLanguageId();
        $browser->setServerParameter('HTTP_sw-language-id', $languageId);

        $browser->request(
            'PATCH',
            '/api/country/' . $id,
            [],
            [],
            [],
            json_encode($data, \JSON_THROW_ON_ERROR)
        );