AssertCustomerGroupAlreadyExists.php

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<?php
namespace Magento\Customer\Test\Constraint;

use Magento\Customer\Test\Page\Adminhtml\CustomerGroupNew;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertCustomerGroupAlreadyExists extends AbstractConstraint
{
    const ERROR_MESSAGE = 'Customer Group already exists.';

    public function processAssert(CustomerGroupNew $customerGroupNew)
    {
        $actualMessage = $customerGroupNew->getMessagesBlock()->getErrorMessage();
        \PHPUnit\Framework\Assert::assertEquals(
            self::ERROR_MESSAGE,
            $actualMessage,
            'Wrong error message is displayed.'
        );
    }

    public function toString()
    {
        return 'Customer group already exist.';
    }
}