It's recommanded to test only one case per test, I get the bad practice to put all my testing case into an array:
for (arg1, arg2, result) in [(1,2,3),(-1,-3,-4)]:
assert(my_sum_function(arg1, arg2) == 3)
It's bad but you can make a lot of case and change function name easily.
Maintains few tests is always better to have no test at all. To encourage your team adding tests it should be easy ;). So test the freezed functions is a good start.
I'ld love to write an article about "unexpected testing cases", I have this list of error cases:
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