gistfile1.php

<?php

namespace tests\_pages\user;

use yii\codeception\BasePage;

class LoginPage extends BasePage
{
	public $route = 'account/login';

    public $loginField = 'LoginForm[username]';

	/**
	 * @param string $username
	 * @param string $password
	 */
	public function login($username, $password)
	{
		$I = $this->guy;

		$I->see('Login', 'h1');
        $I->see('Login', '.btn-primary');
        $I->amGoingTo('try to login with empty credentials');
        $I->fillField('#loginform-username', 'xoma@xoma.ru');
        $I->fillField('#loginform-password', 'testpassword');
        $I->uncheckOption('#loginform-rememberme');
        $I->click('#login-btn');
        $I->wait(2);        
        $I->see('You have successfully created your Yii-powered application.');  
        $I->see('Logout (xoma)'); 
	}
}