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Do you follow test driven development?
TDD in construction 🚧
Unit testing be like "all tests passed"
Don't reuse your fixtures!
Each test case should be isolated. Don't ever think just because some function requires a similar input, it's safe to reuse it ALL OVER THE PLACE.
Why? Because someday, you want to change one functionality of one unit.
And you adapt your tests, fix your code, and suddenly, by changing one fixture, you break dozens if not hundreds of unrelated tests and now you have to clean up that mess.
It's even worse for functional tests with all those interwoven parts so that it becomes hard to reason about the scope of your tests when lacking proper documentation.
How I know? BECAUSE I AM CLEANING UP YOUR MESS RIGHT NOW!
rant
fixtures
unit
tests
tdd