protected function addfilterByParent() { $this->productCollectionMock->method('getTable')->with('catalog_product_relation')->willReturn('catalog_product_relation'); $zendDbSelectMock = $this->getMock('Magento\\Framework\\DB\\Select', [], [], '', false); $this->productCollectionMock->method('getSelect')->willReturn($zendDbSelectMock); $zendDbSelectMock->method('join')->willReturn($zendDbSelectMock); $zendDbSelectMock->method('where')->willReturn($zendDbSelectMock); }