Usability is a key aspect in both functional and non-functional testing. While functional testing validates functionality, non-functional testing ensures aspects like usability, performance, etc.

Test Automation Tools are essential in model-based testing as they facilitate the creation and execution of test cases based on the defined models. These tools automate the testing process, ensuring efficiency and accuracy in executing test cases derived from the specified models.

Risk Injection is not a step in risk management; instead, it refers to introducing risks intentionally for testing purposes. The actual steps involve identifying risks, analyzing their impact, and implementing strategies for risk mitigation. This systematic approach helps in understanding and addressing potential challenges proactively.

Resilience testing evaluates how well a system can recover from interruptions, ensuring it maintains functionality even after events like power failures.

Transitioning to exploratory testing requires a gradual shift in the testing approach. Training the team, gradually implementing exploratory testing alongside scripted testing, and leveraging automation for repetitive tasks can facilitate a smooth transition. It's essential to strike a balance, ensuring that the team gains expertise in exploratory testing while maintaining the stability provided by scripted testing in certain areas.

Test strategy provides a high-level view of the testing approach, while the test plan delves into the specifics of test activities, schedules, and resources. The two documents complement each other, with the strategy guiding the overall testing direction and the plan providing detailed implementation steps.

Test closure activities typically start during the Closure phase of the project. This phase involves wrapping up project activities, including testing. Initiating test closure activities at this point ensures a systematic and organized conclusion to the testing process before the project concludes.

Jenkins is a widely used CI tool that integrates seamlessly into CI/CD pipelines. It allows automated testing to be executed continuously, ensuring that testing is an integral part of the development process. Selenium, JIRA, and LoadRunner may play roles in testing but aren't specialized CI tools.

Security testing in functional testing aims to ensure the confidentiality, integrity, and non-repudiation of the software system. Non-repudiation ensures that actions performed by users or processes within the system can be traced back and verified, preventing denial of involvement.

Selecting a test execution tool involves considering factors like compatibility with the project's technology stack, meeting application requirements, and integration capabilities with development tools. A free trial period allows teams to evaluate the tool's suitability, and popularity within the testing community often indicates reliability. The right tool choice contributes to effective test automation and overall project success.

Test coverage refers to the completeness of testing activities, ensuring that the system has been thoroughly tested by covering all identified test scenarios.

Selenium Synchronization is a technique that helps manage the timing differences between the test script and the application's behavior. It is crucial for handling dynamic web elements and ensuring the script waits for the expected conditions to be met before proceeding to the next command.