Testing Trading Systems That Regulators Will Examine Audits arrive with questions your engineers cannot answer from memory. Doing testing trading systems properly leaves a trail that speaks for itself. Testers document every scenario, every result, and every fix that followed. Reporting accuracy, trade records, and control checks all carry evidence behind them. Nothing rests on somebody remembering how a decision was made two quarters ago. When reviewers come, you hand over proof instead of assurances. Readiness like that is one reason firms have grown comfortable putting their faith in QASource.