Build tests to verify functionality Build tests that verify your Scripted REST web services functionality as part of your development process. Use repeatable tests to ensure that your API functions the way you expect it to. Testing also helps ensure that changes you make do not affect the expected API behavior after you release a version. You can use a REST client application that supports automated testing, such as Postman, to facilitate testing. Tests should validate the response code, headers, and body content as appropriate for each resource you implement. You can also use tests to validate authentication requirements, and to confirm that errors return useful responses.