Every code change carries the risk of breaking something that already worked. Regression testing is the safety net that catches those breaks.

What regression testing is

Re-running tests on existing functionality after changes to confirm nothing broke. It answers the question: did this change break anything else?

Why it happens

Software is interconnected. A change to the payment module can break the checkout page. A database update can break search. Side effects are common and often unexpected.

Manual regression testing

A tester walks through key flows after each change — login, core features, checkout, admin functions. Thorough but time-consuming as the product grows.

Automated regression suites

Automated tests run the same checks on every build in minutes. They scale far better than manual regression as features accumulate.

What to include in regression tests

Cover critical business flows, recently changed areas, and features that have broken before. Prioritize by business impact, not by code coverage alone.

When to run regression tests

Before every release at minimum. Ideally, automated regression runs on every code merge through CI.

Balancing coverage and speed

A regression suite that takes six hours to run slows releases. Focus on high-impact tests that run in minutes, and run deeper suites before major releases.

Regression vs other testing types

Regression confirms existing behavior still works. It complements — not replaces — testing of new features, performance, and security.

The takeaway

Regression testing protects your existing functionality from the side effects of change. Automate critical flows and run regression before every release.

Hedztech builds regression test suites that scale with your product. See QA and testing services, or book a consultation.