In episode 10 of Software Testing with Fexingo, Lucas and Luna dive into the concept of testability as a design principle, not an afterthought. They dissect how code written without testing in mind creates hidden costs—longer debug cycles, flaky suites, and fragile refactors. Lucas introduces the concrete example of a fintech startup whose QA velocity doubled after enforcing dependency injection and interface segregation. Luna challenges him on whether testability can be retrofitted, and they walk through a real-world case of a legacy monolith that was gradually untangled. The episode closes with a specific checklist for developers and QA teams to evaluate testability before the first pull request. No vague platitudes—just actionable architecture decisions.

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