回忆一下我前面曾说过，过分集中于功能测试是一个典型错误。
Recall that I earlier claimed an over-concentration on functional testing is a classic mistake.
但近几年来，一些着眼于功能测试的开放源码工具脱颖而出；而且，能轻易地在开发生命周期的早期使用这些工具。
In the last few years, however, a number of open source tools have sprung up that address functional testing; moreover, you can easily employ these tools early in the development life cycle.
这种情况下，功能测试类似于视察同一建筑现场的房主。
Functional tests in this scenario are analogous to the homeowner visiting this same construction site.
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