invariant testing

Invariant testing defines properties that must always hold and uses fuzzing to try to violate them.不变量测试定义了必须始终成立的属性，并使用模糊测试来试图违反它们。

Writing strong invariants, such as 'total deposits always equal total withdrawals', catches systemic logic errors before deployment.编写强不变量（例如“总存款总是等于总取款”）可以在部署前捕获系统性逻辑错误。