public function testGetItemsCollectionWithoutId()
{
$items = [];
$itemMock = $this->getMockBuilder('\\Magento\\Sales\\Model\\Order\\Creditmemo\\Item')->disableOriginalConstructor()->getMock();
$itemMock->expects($this->never())->method('setCreditmemo');
$items[] = $itemMock;
/** @var ItemCollection|\PHPUnit_Framework_MockObject_MockObject $itemCollectionMock */
$itemCollectionMock = $this->getMockBuilder('\\Magento\\Sales\\Model\\Resource\\Order\\Creditmemo\\Item\\Collection')->disableOriginalConstructor()->getMock();
$itemCollectionMock->expects($this->once())->method('setCreditmemoFilter')->with(null)->will($this->returnValue($items));
$this->cmItemCollectionFactoryMock->expects($this->any())->method('create')->will($this->returnValue($itemCollectionMock));
$itemsCollection = $this->creditmemo->getItemsCollection();
$this->assertEquals($items, $itemsCollection);
}
