What is regression testing?

[mportnov]

DEFINITION: Partial retesting of a modified program to make sure that no new errors were introduced while making changes to the code (developing new or fixing existing one)

• should be done for each new release (build)
• we do not have enough time to retest software completely. Risk analysis is involved when we decide on which parts should be tested (partial retesting)
• second (to release acceptance) most frequently executed test
• very good candidate for automation

AVOID:
- after fixing a bug
- after new feature was added
- making sure the bug was fixed
- not about manual/automated or black/white box