Whenever I start working somewhere new one of my side projects outside of whatever assigned work or feature work that I have is to write a test case that proves

Whenever I start working somewhere new one of my side projects outside of whatever assigned work or feature work that I have is to write a test case that proves that something that was thought to be in a certain way isn't. After having done so I suddenly feel way more comfortable at my desk. I'd love to prove things wrong for my master's thesis but novelty is a grading criterion so that's a no-go.