How do you usually test rule-heavy logic with lots of edge cases?

[spellbeegamecom]

Hi everyone,

I’m working on some rule-heavy logic where behavior changes based on a growing set of conditions, and I’m finding it tricky to keep my JUnit tests both readable and complete. As more rules are added, the number of edge cases explodes, and tests start to feel repetitive.

This reminded me of something unrelated I was doing for unlimited spelling practice, where the real challenge isn’t a single case but validating that all rules are enforced correctly over many iterations. It made me think about testing strategy more generally.

When you’re dealing with logic like this, do you prefer parameterized tests, custom test data builders, or some other approach to avoid brittle or overly verbose test suites? Any patterns you’ve found especially effective?