Unit Test

Unit testing (or development/module/build testing) is a type of functional testing.  Unit testing is organized by software build elements (files/classes/functions) and is performed in a virtual environment (without physical hardware) often with incomplete services and functions.  Branches or paths define a process for Unit Test coverage (e.g. MC/DC).  See Integration Testing for the process of combining all software build elements into a product or system for Verification or Validation testing.