Limited Time Offer! For Less Than the Cost of a Starbucks Coffee, Access All DevOpsSchool Videos on YouTube Unlimitedly. Master DevOps, SRE, DevSecOps Skills! Enroll Now History & Origin of Unit Testing In 1997, a programmer named Kent Beck created a development environment plugin, JUnit, to test small pieces of code. Developers wrote test code that assessed the source code. He called the approach unit testing. A unit test is a way of testing a unit – the smallest piece