Overview
Verifying the 'What'
Functional testing ignores the internal code structure and focuses solely on the outputs generated in response to selected inputs and conditions.
Functional testing is typically defined by Business Requirements. If a requirement says 'The user must be able to reset their password', functional testing verifies that this workflow works as expected.
Our Recommendation
10/ 10
Best Practices
Dos and Don'ts
Avoid common mistakes that can lead to flaky tests and maintenance nightmares.
What to do
- •Base your test cases on the Acceptance Criteria (AC).
- •Include both positive and negative functional scenarios.
- •Automate repetitive functional checks to allow for more manual exploratory testing.
Common Pitfalls
- •Don't confuse functional testing with non-functional testing (like performance or usability).
- •Don't assume 'no errors' means 'correct functionality'.
The Details
Functional vs. Non-Functional: The QA Balance
A common trap for junior QAs is focusing exclusively on functional testing. However, a feature can be functionally correct but operationally useless. For example, a search bar that returns the correct results (Functional Success) but takes 30 seconds to load (Non-Functional Failure) is a poor user experience.
Strategic QA Management involves ensuring the team covers the functional basics early (Unit/Integration) while slowly introducing non-functional layers as the product matures.