I'm definitely not advocating for unnecessarily complex or long conditionals on a single line or any other hard-to-grok code, but this comment reminded me of something I just learned recently! Someone on my team introduced me to property-based testing, which generates ranges of test cases that would otherwise be very repetitive to write manually. We've used http://hypothesis.works/ in a few places recently and caught bugs that we might have missed if we had just written tests the usual way.