Yes ofcourse. Having tests helps a lot, take as example someone building a markdown parser. If u have the knowledge of how to build parsers, then an existing su

Yes ofcourse. Having tests helps a lot, take as example someone building a markdown parser. If u have the knowledge of how to build parsers, then an existing suite of tests is going to speed your work quite a bit by ensuring that you build the right thing and covering the exact features you need without any ambiguity. Ofcourse I do realise that in real world examples there's not many test cases which cover a feature fully. But this was all thinking hypothetically.