public function testGetIncrementId() { $id = 1; $transactionModelMock = $this->getMockBuilder('Magento\\Sales\\Model\\Order\\Payment\\Transaction')->disableOriginalConstructor()->setMethods([])->getMock(); $this->prepareTransactionOrder($transactionModelMock, $id); $this->assertEquals($id, $this->transactionMapper->getIncrementId($transactionModelMock)); }