Explore the evolving landscape of testing cloud-native applications in this 48-minute LASCON conference talk. Delve into the A's, B's, and Four C's of modern testing methodologies, examining crucial aspects such as Software Bill of Materials (SBOM), Architectural Bill of Materials, and high-level threat modeling concepts. Learn about API testing, component analysis, compute resources, and cloud configuration. Discover how to create effective data flow diagrams, map threats to asset types, and develop comprehensive test plans. Gain insights into reporting strategies, security and risk management practices, and the role of service owners and developers in the testing process. Conclude with a Q&A session addressing additional resources and audience inquiries.