Testing of custom features by the project team involves unit testing, which is standalone testing of code artifacts, and is usually performed by the developers to ensure that individual code elements are working as expected. In software engineering terms, unit testing typically refers to automated testing. It provides many benefits that include finding bugs earlier, providing a safety net of tests for changes that are made later, and improving design. Over the long term, unit testing improves customer satisfaction and developer productivity.

Along with the unit testing, individual custom features need to be configured and tested to ensure that these custom features work according to requirements.