Dive into the third part of a comprehensive hands-on introduction to software testing in this EuroPython 2013 conference talk. Explore advanced topics such as unit testing, single behavior release, test files, and the challenges of testing complex systems. Learn about mocking libraries, including mock replay and mock method calling techniques. Examine various test cases and gain insights into the philosophy behind effective testing practices. Conclude with an overview of integration testing, equipping you with essential knowledge to enhance your software testing skills.