Regression testing

Test of Object-oriented Programs - slide 18 : 35

Regression testing

The purpose of regression test is to find regression errors

A regression error is an error in a previously correct program, which recently has been modified

A regression error is an error which not used to be there

After modification of part P in a program Q
- Test that the part P works correctly
- Test that the overall program Q has not been affected by the modification

Execution of regression test
- Very time consuming if it is left as a manual activity
- Automation is crucial
  - Re-run all tests upon each modification and/or
  - Re-run all test every night