如何在Symfony 4的功能测试中对用户进行身份验证

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

class AuthenticationTest extends WebTestCase
{
    public function testAuthentication()
    {
        $client = static::createClient();

        // 模拟用户登录
        $crawler = $client->request('POST', '/login', [
            'username' => 'testuser',
            'password' => 'testpassword',
        ]);

        // 验证身份验证是否成功
        $this->assertEquals(200, $client->getResponse()->getStatusCode());
        $this->assertContains('Welcome', $client->getResponse()->getContent());

        // 访问受保护的页面
        $crawler = $client->request('GET', '/protected-page');

        // 验证访问权限
        $this->assertEquals(200, $client->getResponse()->getStatusCode());
        $this->assertContains('Protected Page', $client->getResponse()->getContent());
    }
}