Regression Testing
Definition
Regression tests look for unintended degradations after changes.
A test that checks whether a change has unintentionally degraded previously functioning features.
Simply explained
After a refactoring, it is checked whether things that previously worked still function.
Why it matters in practice
The term contributes to secure, maintainable, and high-performance web applications as well as resilient technical decisions.
Example from business
After an API change, the existing test suite for orders runs again.
Limits and pitfalls
- Only testing happy paths, tolerating flaky tests, or preserving faulty expectations unchanged.
Origin & history
Regression tests became central with growing software complexity and automated build processes.
Use in mid-sized companies
- Possible application: After an API change, the existing test suite for orders runs again.
Frequently asked questions
What does regression test mean?
A test that checks whether a change has unintentionally degraded previously functioning features. What mistakes should be avoided? Only testing happy paths, tolerating flaky tests, or preserving faulty expectations unchanged.
Sources
Source checked on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
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