Fast, Independent Tests and Refactoring Are Key to Controlling Technical Debt

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A software engineering analysis highlights two core development principles — fast, independent testing and continuous refactoring — as essential for sustaining code quality over time. The piece draws on Lehman's Law of Increasing Complexity, which states that software systems grow more complex by default unless actively simplified. Slow or order-dependent tests discourage developers from running test suites, eroding trust and halting refactoring efforts. A 2018 Stripe report estimated that developers lose roughly a third to 40% of their work week dealing with technical debt, costing hundreds of billions of dollars globally each year. The article uses code examples to contrast tightly coupled, database-dependent tests against fast, in-memory alternatives that follow the FIRST principles outlined by Robert C. Martin in Clean Code.

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