Certified Associate in Software Testing (CAST) 2025 – 400 Free Practice Questions to Pass the Exam

Functional testing primarily focuses on verifying that the software application operates according to the specified requirements and design documents. Its purpose is to ensure that the system meets the expected functionality by testing individual functions or features and how they integrate with one another.

By validating that the system performs as specified, functional testing checks whether the outputs and behaviors of the software align with the requirements laid out by stakeholders. This art of testing is critical since it confirms that the essential functions of the application work correctly and deliver the desired results from a user's perspective.

The other options do not accurately describe the objectives of functional testing. While ensuring that a system is error-free is an aspiration of many testing forms, functional testing does not guarantee complete error elimination. Additionally, functional testing does not specifically assess performance metrics such as speed or resource efficiency; those aspects are typically evaluated under performance testing or load testing.