stateAssignTest.php

<?php

$stateId = 3;

$stateService = $this->get('ezpublish.api.service.object_state');
$contentService = $this->get('ezpublish.api.service.content');

$contentInfo = $contentService->loadContentInfo(93);
$objectStateGroup = $stateService->loadObjectStateGroup(4);

$currentState = $stateService->getContentState($contentInfo,$objectStateGroup);

if($currentState->id == 3) {
    $stateId = 4;
}

$objectState = $stateService->loadObjectState($stateId);

$stateService->setContentState($contentInfo,$objectStateGroup,$objectState);

dump($currentState);
die();