Behat 和 Symfony2 捆绑问题

Behat 和 Symfony2 捆绑问题

gherkin
功能：登录到应用程序
  背景：
    假如我打开登录页面
  场景：使用有效的凭据登录
    当我输入用户名 "john" 和密码 "password"
    那么我应该看到欢迎消息 "欢迎，John！"
  场景：使用无效的凭据登录
    当我输入用户名 "john" 和密码 "wrongpassword"
    那么我应该看到错误消息 "无效的用户名或密码"

php
// FeatureContext.php
use Behat\Behat\Context\Context;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\KernelInterface;
use Symfony\Component\BrowserKit\Client;
class FeatureContext implements Context
{
    private $client;
    private $kernel;
    public function __construct(KernelInterface $kernel)
    {
        $this->kernel = $kernel;
        $this->client = new Client($kernel);
    }
    /**
     * @Given /^I am on the login page$/
     */
    public function iAmOnTheLoginPage()
    {
        $this->client->request('GET', '/login');
        $response = $this->client->getResponse();
        $this->assertResponseStatusCode($response, 200);
    }
    /**
     * @When /^I enter username "([^"]*)" and password "([^"]*)"$/
     */
    public function iEnterUsernameAndPassword($username, $password)
    {
        $this->client->request('POST', '/login_check', [
            'username' => $username,
            'password' => $password
        ]);
    }
    /**
     * @Then /^I should see welcome message "([^"]*)"$/
     */
    public function iShouldSeeWelcomeMessage($message)
    {
        $response = $this->client->getResponse();
        $this->assertResponseStatusCode($response, 200);
        $this->assertResponseBodyContains($response, $message);
    }
    /**
     * @Then /^I should see error message "([^"]*)"$/
     */
    public function iShouldSeeErrorMessage($message)
    {
        $response = $this->client->getResponse();
        $this->assertResponseStatusCode($response, 200);
        $this->assertResponseBodyContains($response, $message);
    }
    private function assertResponseStatusCode(Response $response, $statusCode)
    {
        assert($response->getStatusCode() === $statusCode);
    }
    private function assertResponseBodyContains(Response $response, $content)
    {
        assert(strpos($response->getContent(), $content) !== false);
    }
}