Join me in exploring a variety of testing tools and techniques for .NET applications, including those for command-line interfaces, APIs, and serverless applications. We'll discuss the different use cases and difficulty levels for each tool, and learn how to incorporate them into our testing processes for both existing and brand-new applications, also understanding how to prioritize each type of testing technique. The goal of this lecture is to promote a "shift left" testing culture and ensure the quality of our software.