As developers write code, they can build unit testing modules directly into the code to ensure that by the time a piece of software has moved through the DevOps lifecycle, it has already been tested against most scenarios. If done correctly, this is a very efficient way to test code. Building testing modules into code requires that a fair process is in place to ensure that testing occurs throughout the entire process. Once done, this module can perform some of the duties required from a QA tester.