I think the second set of tests misses the point of what a test suite should do, which is limited to making bugs visible. That's it! The analysis of the bug (which your second set of tests begins to do) should come after. All you want to do at this stage is to make it your program fail a test: the simplest the path there the better. (Of course, if you program does not fail despite your efforts, good for you, grab a beer.) It's like when you put a filled inner tube under water to quickly find the location air leaks (if any). That's all you'd expect from this test. You don't expect this test to tell you the diameter of the hole, or how it got there, or what it will take to fix it, or anything else.
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