In the context of continuous deployment, it is crucial to include a comprehensive level of automated testing that encompasses both integration and system testing. This ensures that all components of the application work together seamlessly and that the system as a whole functions correctly before deployment. Automated unit testing alone is not sufficient, as it does not cover the interaction between different parts of the system.
Similarly, while UAT, other acceptance testing, and regression testing are important, they do not provide the same level of coverage as integration and system testing in a continuous deployment process.
References = The ISTQB Advanced Level Agile Technical Tester documents outline the importance of applying Agile techniques to ensure tests provide adequate coverage, including test automation approaches and supporting continuous deployment and delivery12.