отредактировав assertEqualXMLStructure игнорировать проверить количество детей тегов я решить мою проблему:
public static function assertEqualXMLStructure(DOMElement $expectedElement, DOMElement $actualElement, $checkAttributes = FALSE, $message = '') {
self::assertEquals($expectedElement->tagName, $actualElement->tagName, $message);
if ($checkAttributes) {
self::assertEquals($expectedElement->attributes->length, $actualElement->attributes->length, sprintf('%s%sNumber of attributes on node "%s" does not match', $message, !empty($message) ? "\n" : '', $expectedElement->tagName));
for ($i = 0; $i < $expectedElement->attributes->length; $i++) {
$expectedAttribute = $expectedElement->attributes->item($i);
$actualAttribute = $actualElement->attributes->getNamedItem($expectedAttribute->name);
if (!$actualAttribute) {
self::fail(sprintf('%s%sCould not find attribute "%s" on node "%s"', $message, !empty($message) ? "\n" : '', $expectedAttribute->name, $expectedElement->tagName));
}
}
}
PHPUnit_Util_XML::removeCharacterDataNodes($expectedElement);
PHPUnit_Util_XML::removeCharacterDataNodes($actualElement);
for ($i = 0; $i < $expectedElement->childNodes->length; $i++) {
self::assertEqualXMLStructure($expectedElement->childNodes->item($i), $actualElement->childNodes->item($i), $checkAttributes, $message);
}
}