Even when such systems are available, the test data may not be suitable for exercising all code paths; that is, it may be difficult to simulate some error conditions.
即使在这些系统可用时，测试数据也可能不适于使用所有代码路径；也就是说，模拟一些错误条件可能会很困难。
It is very important that you test error conditions in your code.
测试您的代码中的错误情况非常重要。
This can make test writing simpler and less error-prone, and also result in test code that is shorter and more readable.
这会简化测试的编写并减少错误，还会使测试更简短、可读性更好。
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