在马里兰的Goddard空间中心，NASA的硬件和系统工程师测试了汽车的机械部件，试图定位可能产生风门非正常打开问题的条件。

And at the GoddardSpace Flight Center in Maryland, NASA hardware and systems engineers tested thecars' mechanical components to identify conditions that could unexpectedly openthe throttle.

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常常被忽视的一种测试用例是边界条件：当遇到不正常的输入时，代码会做什么？

Some of the oft-neglected test cases are boundary conditions: what will your code do when faced with unusual input?

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该方法可以在装置正常工作的条件下，进行多次阶跃测试，因而在工程上是比较实用的。

The notable characteristic of this method is that the multi step test can be done under the normal operation, and that it has strong practicality on the real engineering.

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