public function test_getQueryToSelect() { /** === Setup Mocks === */ // $result = $this->_factorySelect->getQueryToSelect(); $mQuery = $this->_mockDbSelect(); $this->mFactorySelect->shouldReceive('getQueryToSelect')->once()->andReturn($mQuery); /** === Call and asserts === */ $res = $this->obj->getQueryToSelect(); $this->assertInstanceOf(\Magento\Framework\DB\Select::class, $res); }