http://hermanradtke.com/2014/03/21/testing-repeated-elements-with-behat-mink.html

behat-step

<?php
/**
* @Then /^(?:|I )should see the following in the repeated "(?P<element>[^"]*)" element within the context of the "(?P<parentElement>[^"]*)" element
*/
public function assertRepeatedElementContainsText(TableNode $table, $element, $parentElement)
{
    $parent = $this->getSession()->getPage()->findAll('css', $parentElement);

    foreach ($table->getHash() as $n => $repeatedElement) {
        $child = $parent[$n];

        \PHPUnit_Framework_Assert::assertEquals(
            $child->find('css', $element)->getText(),
            $repeatedElement['text']
        );
    }
}