Functionality Testing Explained | Positive & Negative Testing | Black Box Testing | QA Vault

Welcome back to QA Vault! 🎯
In this video, we take a deep dive into Functionality Testing, one of the most important types of Black Box Testing.

Functionality Testing verifies whether each feature of the application behaves exactly as defined in the requirements. It ensures the system does what it is supposed to do — with no missing features or unexpected behavior.

🔹 Key Topics Covered in This Video:

* What is Functionality Testing and where it fits in Black Box Testing
* Why functionality testing is critical for software quality
* Three approaches to functionality testing:

* Over Testing (Exhaustive / Donkey Testing): Testing every possible input, which is time-consuming and adds little value
* Under Testing: Testing limited inputs, which leaves many defects undetected
* Optimized Testing: The balanced and recommended approach

🔹 Optimized Testing Types:

* Positive Testing: Verifies that the system works correctly with valid inputs
* Negative Testing: Checks how the system handles invalid or unexpected inputs

💡 Examples Covered:

* Valid login credentials → Successful login
* Invalid inputs like special characters in number-only fields

📌 In the next video, we’ll explore Integration Testing, another core type of functional testing.
👉 Stay tuned to QA Vault for clear, practical, and beginner-friendly Software Testing tutorials.

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