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Software Design: Tidy First?

Explores the concept of composable tests as distinct from isolated tests. While isolated tests run independently regardless of order, composable tests work together as a suite to provide comprehensive coverage without redundancy. The article demonstrates how removing redundant assertions from overlapping tests maintains predictive power while improving readability and specificity. Using an N×M example with interest computation and reporting, it shows how 10 well-composed tests can provide the same confidence as 20 brute-force tests. The approach requires thoughtful design to ensure orthogonal test dimensions but results in faster, more maintainable test suites.

Composable Tests