Acceptance Test with URL redirection

Question

Hello I’m trying to generate a acceptance test to my login page using codeception and Yii2, only that the problem is that after the login the user is redirected to the main page and there the user, already logged in, visualizes a welcome message. I’ve tried several ways but I couldn’t go on. Someone can help me! Thank you.

use \AcceptanceTester;

class LoginCest
{
    public function login(AcceptanceTester $I)
    {
        $I->am('Login Page');
        $I->wantTo('Login Exists?');
        $I->amOnPage('/index.php?r=site/login');
        $I->see('Title');
        $I->see('User');
        $I->see('Password');
    }

    /**
    * @after login
    */
    public function validLogin(AcceptanceTester $I)
    {
        $I->amOnPage('/index.php?r=site/login');
        $I->fillField('LoginForm[username]', 'username');
        $I->fillField('LoginForm[password]', 'password');
        $I->click('Login');
        $I->amOnPage('/index.php');
        $I->see('Welcome {UserName}!', 'h1');
    }
}

Scenario Steps:
6. I see "Welcome!","h1" <<< FAIL
5. I am on page "/index.php"
4. I click "Login"
3. I fill field "LoginForm[password]","username"
2. I fill field "LoginForm[username]","password"
1. I am on page "/index.php?r=site/login"

FAILURES! Tests: 2, Assertions: 4, Failures: 1.