Write the first test before touching payroll files

Payroll needs contractor hours transformed into payment rows. The quarter-hour rounding rule affects real pay, so a visual spot-check after export is too late. TDD: write a failing check for the business rule, implement just enough code to pass it, then refactor safely. The common shortcut is to code the whole converter, export a plausible file, and rely on payroll to notice subtle rounding mistakes. Before Manual spot-check of a 2,000-row export after transformation. After Two readable test cases prove the rounding rule before the export function exists. Step 1 Write the rule as examples: 7.26 hours -> 7.25; 7.38…

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