AssertCustomerBackendDuplicateErrorMessage.php

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

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

class AssertCustomerBackendDuplicateErrorMessage extends AbstractConstraint
{
    const ERROR_SAVE_MESSAGE = 'A customer with the same email address already exists in an associated website.';

    public function processAssert(CustomerIndex $customerIndexPage)
    {
        $actualMessage = $customerIndexPage->getMessagesBlock()->getErrorMessage();
        \PHPUnit\Framework\Assert::assertEquals(
            self::ERROR_SAVE_MESSAGE,
            $actualMessage,
            'Wrong error message is displayed.'
            . "\nExpected: " . self::ERROR_SAVE_MESSAGE
            . "\nActual: " . $actualMessage
        );
    }

    public function toString()
    {
        return 'Assert that error duplicated message is displayed.';
    }
}