Look for TDD tutorials for less trivial examples of what you should test. You want a general 'how do I know what to test' tutorial, rather than 'how do I use te

Look for TDD tutorials for less trivial examples of what you should test. You want a general 'how do I know what to test' tutorial, rather than 'how do I use testing framework X' (which is what you were probably reading, if they show you how to test 1+1). Other than that, just be explicit about your api contracts and test those.