What are all the possible test cases for the requirement: username will allow 4-12 alphanumeric characters?

Steven Roger is a technology blogger for the H2K Infosys blog, where he brings complex tech concepts to life with clear, engaging insights. With a passion for IT education and over a decade of industry experience, Steven specializes in demystifying the latest in software development, business analysis, and quality assurance training. His articles provide readers with practical knowledge and tips on upskilling for successful careers in tech.