/**
  * @covers \BackBee\NestedNode\Repository\NestedNodeRepository::getPrevSibling
  */
 public function testGetPrevSibling()
 {
     $child1 = $this->repository->find('a-child1');
     $child2 = $this->repository->find('a-child2');
     $subchild1 = $this->repository->find('a-subchild1');
     $subchild2 = $this->repository->find('a-subchild2');
     $this->assertNull($this->repository->getPrevSibling($this->root_desc));
     $this->assertNull($this->repository->getPrevSibling($child1));
     $this->assertNull($this->repository->getPrevSibling($subchild1));
     $this->assertEquals($subchild1, $this->repository->getPrevSibling($subchild2));
     $this->assertEquals($child1, $this->repository->getPrevSibling($child2));
 }