Тестирование Ajax в режиме кодирования (5) yii2

use tests\codeception\frontend\AcceptanceTester;

$I = new AcceptanceTester($scenario);
$I->wantTo('perform actions and see result');
$I - > amonpage ('/'); // switch to the configuration site http://admin.handone.com
$I - > see ('login '); // assert that you can see the specified text on this page

$I->amGoingTo('try to login with correct credentials');
$I - > fillfield ('input [name = "loginform [t_email]] ',' user name ');
$I - > fillfield ('input [name = "loginform [T" password]] ',' password ');
$I - > Click ('login ');
$I->expectTo('see that user is logged');
$I - > SeeLink ('exit ');
$I - > dontseelink ('login ');

$I->wantTo('perform actions and see result');
$I->amOnPage('http://xxx.xxx.xx/sales/index');    
$I - > see ('add customer ');

$param = [
    'Sales[t_clues_cat]'=> 9,
    'keys_str' => 10449,
];
$I->sendAjaxRequest('post', 'http://xxx.xxx.xx/sales/sales-free', $param);
$I->seeResponseCodeIs(200);
$I - > see ('1 '); // 1 means success

$param = [];
$I->sendAjaxRequest('post', 'http://xxx.xxx.xx/sales/sales-free', $param);
$I->seeResponseCodeIs(200);
$I - > see ('2 '); // 2 means failure

codecept run acceptance SalesCept --debug