Excellent one!

The testing basics are basic tenets that guide the testers as to how to test and why testing is done. These were formulated by the ISTQB (International Software Testing Qualifications Board) and are universally adopted in the software sector.



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7 Software Testing Basics

1. Testing Reveals the Existence of Defects, Not Their Absence

Testing can reveal defects, but it cannot prove that the software is 100% bug-free.

Even after thorough testing, there may still be undiscovered defects.

Example: You can test an app and find no errors — but that doesn’t mean none exist; maybe you just didn’t test the right conditions.



2. Exhaustive Testing is Impossible

It’s not practical to test all possible inputs, combinations, and paths in an application.

Instead, the testers do risk-based and priority-based testing.

Example: You can't test every possible password a user could input; you test common and edge cases instead.



3. Early Testing Saves Time and Money

Testing must begin as early as possible within the Software Development Life Cycle (SDLC).

Finding and fixing defects early is much more cost-effective than discovering them after release.

Example: Detecting a design flaw in the planning phase costs much less than correcting it in production.



4. Defects Cluster Together

The majority of defects reside in a few modules in most software.

Testers can concentrate more effort on high-risk or failing most often sections.

Example: The payment module of an e-commerce website has more problems than static pages.



5. Pesticide Paradox

Repeating the same tests over and over again will eventually stop discovering new bugs.

In order to continue testing effectively, test cases must be updated and re-examined regularly.

Example: As pests develop resistance to the same pesticide, so too can software bugs go undetected if tests aren't updated.

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6. Testing is Context Dependent

Depending on the type of software, project objectives, and environment, how you test varies.

Different systems need to be tested in different ways.

Example: Filling out a form on a website requires more attention to security than a game on a phone.



7. No Errors Fallacy

Just because the software is error-free, it will still be useless to users.

Testing should prove that the software does the correct thing, not merely that it's free from errors.

Example: A flawlessly written app which doesn't fix the user's issue is still a failure.

Do you want me to prepare a brief summary table of these principles for rapid revision or exam study?



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