public function testGetChildrenIds()
{
$this->registry->getManagerForClass('OroB2BCatalogBundle:Category')->clear();
/** @var Category $category */
$categories = $this->repository->findAll();
$parent = $this->findCategoryByTitle($categories, LoadCategoryData::FIRST_LEVEL);
$childrenId1 = $this->findCategoryByTitle($categories, LoadCategoryData::SECOND_LEVEL1)->getId();
$childrenId2 = $this->findCategoryByTitle($categories, LoadCategoryData::THIRD_LEVEL1)->getId();
$childrenId3 = $this->findCategoryByTitle($categories, LoadCategoryData::THIRD_LEVEL2)->getId();
$result = $this->repository->getChildrenIds($parent);
$this->assertEquals($result, [$childrenId1, $childrenId2, $childrenId3]);
}
