This is where another method of testing, unit testing, comes into play.

这时，我们需要使用另一种测试方法，那就是单元测试。

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A comprehensive set of unit tests makes it easy to verify the behavior, letting you freely play "what if" games with optimization without worrying that you've broken something.

全面的单元测试集能够轻松地检查行为是否正确，让开发人员能够专心地优化代码，而不必担心是否会破坏代码的正常行为。

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I play ZAPS, with the Z doubled, and she gets a static shock off the air conditioning unit.

我拼了一个ZAPS（打昏，攻击）, 因为Z得了两倍的分数。 紧接着她碰到空调设备而触电。

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The Satellites followed with an hour and a half of inspired play defending as a unit and attackingwhen merited, and holding the feared Brazilian attack despite their numerical disadvantage.

VOA: standard.2009.10.17

So-called "tic-tac-toe" goals, in which a power-play unit whisks the puck around until a perfect shot comes up, are rare.

WSJ: Rangers Nab Shootout Win

After Strait took down Crosby in overtime, Penguins coach Dan Bylsma used his timeout to rest his power-play unit, and it paid off.

NPR: Kunitz's 2nd PP Goal Gives Pens OT Win Over Isles

More zone time for a power-play unit results in more goals.

WSJ: Rangers Nab Shootout Win