A backtest does not need to crash to be broken. The dangerous version runs cleanly, produces a smooth equity curve, and reports a Sharpe ratio that makes deployment feel obvious. Then live performance diverges because one quiet assumption allowed future information, ignored trading costs, or re...
Source: [Dev.to](https://dev.to/backtestguard/your-backtest-can-pass-for-the-wrong-reason-5-python-checks-before-deployment-56m4)