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Write Failing Tests Then Code Refactor Employee Payouts in Python using TDD

Test Driven Development (TDD) is a software design methodology defined by a three-step iterative cycle known as "Red-Green-Refactor." This principle mandates that developers write failing unit tests based on specifications before implementing the corresponding logic, thereby enforcing requirement clarity and ensuring code adheres to specific behavioral contracts prior to execution. The theory posits that this disciplined approach promotes testable architecture, early defect detection, and maintainability by coupling implementation strictly with a pre-existing validation harness within an agile context.