Software Quality Assurance Practice Exam

Which of these statements about Bottom-up testing is correct?

1. It tests from a higher level module to a lower level module.

2. It requires complete application before testing can begin.

3. It implements testing from sub modules towards the main module.

4. It is always faster than Top-down testing.

The correct answer is: It implements testing from sub modules towards the main module.

In Bottom-up testing, the approach focuses on testing from the lowest-level modules, or sub-modules, and gradually integrates them into higher-level modules or the main application. The rationale behind this method is to verify each individual component thoroughly before they are combined, ensuring that when the higher-level modules are eventually tested, they are built upon verified, functioning components. This strategy allows for identifying and resolving issues early in the development process, ultimately leading to a more stable final product. Testing begins with the most granular parts of the application, which means that any defects at these lower levels are caught and rectified before progressing to the integration of higher-level functionalities. This contrasts with other testing strategies, such as Top-down testing, where testing begins with higher-level modules and gradually moves to the lower levels. The assertion in the correct statement highlights the foundational principle of Bottom-up testing and its progressive approach to ensuring quality in software development. Contextually, the other options do not reflect the mechanics of Bottom-up testing accurately. The first option, suggesting that testing starts from higher to lower modules, describes the opposite of Bottom-up testing. The second option implies a requirement of complete application readiness before testing can commence, which is not a characteristic of Bottom-up testing. Lastly, while