A person who does nothing but to compare a program against some reference is a checker, not a tester.
而仅仅根据参考文档来比较当前程序的人也是检查人员，不是测试人员。
Click here to download the sample Triangle Tester program.
单击此处，下载示例程序Triangle Tester。
One day, a tester working on the program noted that a requirement specifying the possible values of this Cheese attribute had recently changed. No longer was it two bytes.
一天，从事于这个程序的测试人员注意到，一个说明了Cheese属性可能值的需求最近已经变化了，不再是两个字节。
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