protected function setUp()
 {
     $objectManager = new ObjectManager($this);
     $this->classModelFactoryMock = $this->getMockBuilder('Magento\\Tax\\Model\\ClassModelFactory')->setMethods(['create'])->disableOriginalConstructor()->getMock();
     $this->taxRuleRegistry = $objectManager->getObject('Magento\\Tax\\Model\\ClassModelRegistry', ['taxClassModelFactory' => $this->classModelFactoryMock]);
     $this->classModelMock = $this->getMockBuilder('Magento\\Tax\\Model\\ClassModel')->disableOriginalConstructor()->getMock();
     $this->classModelFactoryMock->expects($this->any())->method('create')->will($this->returnValue($this->classModelMock));
 }