Mark Seemann • 12/15/2025

Tautological assertions are not always caused by aliasing

The article discusses a common pitfall in test-driven development (TDD) where a new unit test passes on the first run, often due to being a tautological assertion. It examines whether such errors are primarily caused by aliasing in object-oriented code or can also occur in functional programming like Haskell, emphasizing the importance of the red phase in the red-green-refactor cycle.

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#software engineering #unit testing #test-driven development