Unit testing for the TYPO3 4.x core

This document discusses unit testing for the TYPO3 4.x core. It notes that unit testing is faster than manual testing and can catch regressions. Over 2400 tests were written for the Seminar Manager extension that take less than 90 seconds to run. The document encourages writing unit tests to learn how parts of the core work, before fixing bugs or refactoring code. A diploma thesis is underway to write unit tests for TCEmain and other parts of the core over 6 months, which will provide more knowledge about bugs and flaws. The document concludes by asking if anyone has any questions.