Software Quality Assurance Practice Exam

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Which testing method is typically the first step in ensuring software quality?

Unit testing.
Integration testing.
Usability testing.
Regression testing.

The correct answer is: Unit testing.

Unit testing is the first step in ensuring software quality because it focuses on validating the smallest testable parts of the software, known as units. This method involves testing individual components or functions in isolation to ensure they work correctly according to their specifications. By identifying and fixing defects at this early stage, unit testing helps to establish a strong foundation for the software's overall quality. Unit testing also contributes to the development process by providing immediate feedback to developers. It allows for easier debugging and facilitates changes and refactoring of code, as developers can quickly determine if their modifications break any existing functionality. Since unit testing is done before integration with other units, it helps to prevent cascading issues that could arise during later testing stages, thereby effectively reducing the cost and effort required to resolve defects later in the development process.